JPH09239207A - Special solid fine powdery flocculant composition and water treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a special solid fine powdery flocculant compsn. added to waste water to be treated to flocculate a suspended pollutant present in waste water within a short time only by stirring or dispersing action and to treat waste water by using the flocculant compsn. SOLUTION: A water-soluble aluminum salt or iron salt type inorg. flocculant, a pH self-controller, a fine powdery polymeric flocculant finer than a generally used one and other essential components are uniformly mixed in a powdery and granular state to obtain a special solid fine powdery flocculant compsn. having functionality. This flocculant compsn. is directly added to waste water to be treated alone under stirring to complete flocculation reaction. The formed floc excellent in shape stability and dehydration properties is separated to be excluded out of the system.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a special solid fine powdery flocculant composition and a wastewater treatment method using the same.
More specifically, the composition of the present invention in which the specific substance is formed in a predetermined mixing ratio, and the composition is applied to wastewater to be treated to aggregate pollutant components in a short time to form flocs that are easily separated. Regarding technology.

[0002]

2. Description of the Related Art Conventionally, as an aggregating agent generally used for wastewater treatment, an inorganic aggregating agent represented by sulfuric acid band, polyaluminum chloride, etc. and pH adjustment, and if necessary, a liquid natural or synthetic A method is well known in which a pollutant is separated from the waste water as flocs by injecting and stirring a molecular coagulant. In both cases, the coagulant is handled as an aqueous solution, so that the addition amount can be maintained relatively accurately even in a small amount. However, on the other hand, storage and transportation costs of the coagulant are high, and in many cases, the polymer coagulant is completely dissolved on site, and it takes a lot of time and labor for the preparation, which is often a problem. Therefore, as a whole, not only a considerable amount of time is required for the treatment, but if the reaction and the residence time are sufficiently secured, the initial cost becomes high as the facility opening cost, which is not preferable.

On the other hand, in order to specifically treat the waste water, it is necessary to select a treatment device and a flocculant suitable for the treatment device, and to accelerate the flocculation speed of the flocculant and improve the dehydration property of the generated flocs. Therefore, various improvement methods have been reported, such as addition of diatomaceous earth, clay, gypsum, limes, calcium carbonate, etc. as an auxiliary agent. For example, JP-A-7-136
Japanese Patent Publication No. 409 discloses various types of mixed composition examples such as aluminum sulfate, calcium sulfate, alkali metal carbonate, cement, zeolite, and cationic flocculant as a flocculant. In addition, not only general factory wastewater but also muddy water from subway construction sites, shield drainage from tunnel construction, concrete drainage from ready-mixed concrete sites, etc. are subject to coagulation treatment. In many cases, it can not be adopted at all, and it is unavoidable that it is handled by a more compact and simple facility, and in practical use, a simpler processing and a more reliable system are desired.

[0004]

As described above, according to the conventional treatment method, the equipment to be adopted becomes complicated,
In addition to requiring a considerable installation area for the processing equipment, the operation becomes complicated and the initial cost and running cost must be high.For example, direct treatment tends to be insufficient at civil engineering construction sites, etc. .

In view of such a situation, the present inventors have found that the handling is easy and the initial cost is low, and that the pollutant components in the wastewater are aggregated in a short time by only adding and stirring the wastewater to be treated, and the dehydration property is good. An intensive and intensive study was conducted to develop a special solid fine powdery flocculant composition with stable flocs.

[0006]

In order to solve the above-mentioned problems, the present inventors have conducted various studies on combinations of conventionally used inorganic coagulants and auxiliary additives, and natural or synthetic polymer coagulants. As a result, we have developed a special solid fine powder coagulant composition that exhibits a coagulation action in a relatively wide range of wastewater in a short time, and the flocs formed are more stable, compact and have good dehydration properties. .

The subject matter of the present invention is that a soluble aluminum compound or a soluble iron salt compound, a natural or synthetic polymer flocculant is used as a flocculating main agent, and an aqueous solution of the flocculating main agent is added to the neutralizing agent at pH value. Alkali metal carbonate and / or cement powder is added to the extent that at least two are selected from the group consisting of alkaline earth metal carbonate, bentonite-based soil mineral powder, and zeolite powder. A special solid fine powdery flocculant composition characterized by being mixed with seeds, and a wastewater treatment method using this composition.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Among the chemicals constituting the composition of the present invention, there are known chemicals which have already been used as components of coagulants in the field of wastewater treatment. The composition of the present invention requires the formation of a specific composition, and the composition of the present invention has an aggregating action based on the synergistic action of each component, and can be easily realized by a known aggregating agent. It has a very novel effect that could not be obtained.

The first feature of the composition of the present invention is that the conventionally used inorganic coagulant and polymer coagulant can be simultaneously added to the waste water as the coagulant main agent. That is, the point is that each aggregation effect is expressed without impairing both properties. For this reason, it is preferable to mix the polymer coagulant as finely powdered as possible, whereby the inorganic coagulant in which each polymer coagulant fine particle coexists and the inorganic coagulant mixed as the third component The action time is almost the same as that of the fine particles, and each component is not isolated and is dissolved at the time of addition in the waste water and the aggregation reaction is completed in an extremely short time.

The second feature of the composition of the present invention is that by adding an alkali metal carbonate and / or cement powder and further adding an alkaline earth metal carbonate, The point is that the pH is kept near neutral and there is no need for special pH adjustment. The reason for this is not clear, but it is presumed that it is due to the buffering effect due to the coexistence of various components. As a result, a pH adjusting facility for injecting a chemical such as an acid or an alkali is not necessary or labor can be saved, and both initial cost and running cost can be improved.

The third feature of the composition of the present invention is that by blending at least two kinds selected from the group consisting of carbonates of alkaline earth metals, bentonite type soil mineral powder and zeolite powder. At the same time that the above ingredients become the core of generated flocs, the synergistic effect of each ingredient can be expected to have an adsorbing action and an aggregating action, which helps to remove COD which is a dissolved component in wastewater, and the obtained flocs are stable and strong. And the dehydration is improved. In particular, an excellent effect is observed in combination with the bentonite soil mineral powder. This effect is that when the flocs are separated as cakes and dehydrated, they can be disposed of as dehydrated cakes having a low water content with simple equipment, and as a result, they will be extremely useful in protecting the global environment.

The fourth feature of the composition of the present invention is that, as described above, it is possible to perform simple and reliable wastewater treatment. Not only is it possible to easily process and recycle, but also at the site where conventional direct processing is performed, it is possible to perform reliable processing with more compact equipment, and the amount of waste finally generated is also conventional. This is much less than that.

The finely powdered polymer flocculant used in the present invention may be either natural or synthetic, and in particular, a cationic polymer flocculant is preferable for the synthetic powder. As the cationic synthetic polymer flocculant used in the present invention, any commercially available product can be used. On the other hand, various polysaccharides can be used in the natural system, but a fine powder obtained by freeze-drying or spray-drying an aqueous solution of an acidic polysaccharide polymer mainly containing β-1,3 glucan cultured by microorganisms is particularly preferable. .

It is very important for the composition of the present invention that the particle size of the fine powder of the polymer flocculant used in the present invention is 80 mesh or more, preferably 100 mesh or more. Particles coarser than this do not exhibit uniform dissolution rate characteristics as a flocculant of the present invention during the treatment of wastewater, and thus adversely affect the agility in terms of flocculation reaction and increase the tackiness of flocs. The object of the invention may be difficult to achieve.

The special solid fine powdery flocculant composition of the present invention can be obtained by simultaneously mixing the specific compounds constituting the present invention in powder form and uniformly mixing them. As the blending ratio of the composition, it is necessary to variably correspond to each other, but the basic composition is determined by the blending amount of the soluble aluminum or soluble iron salt compound as the flocculant component and the natural or synthetic polymer flocculant. You. Alkali metal carbonate and / or cement powder as a pH adjusting agent and carbonates of alkaline earth metal specified in the present invention, bentonite soil mineral powder, zeolite powder A mixture of at least two kinds selected is blended as an essential additive selection substance.

When these compositions are used as the composition weight ratio of the whole composition, the total amount is 100% by weight, and the soluble aluminum compound or the soluble iron salt compound is 15 to 50% by weight. 5 to 25% by weight, 10 to 40% by weight of alkali metal carbonate and / or cement powder, alkaline earth metal carbonate, bentonite-based soil mineral powder, zeolite-based powder The mixture of at least two kinds selected is constituted in the range of 10 to 40% by weight.

In the above composition, if the soluble aluminum or soluble iron salt is 15% by weight or less, the cohesive force is weak,
When the effect of the present invention is hardly exerted, the composition of the flocculant performance is difficult at 50% by weight or more. On the other hand, if the concentration of the polymer coagulant is too low, such as 0.5% by weight or less, the effect of the present invention cannot be obtained because the cohesiveness of the composition itself is sharply reduced.
If the weight% or more, a strong sticky floc can be obtained,
It is not preferable because dehydration property is deteriorated. In addition, the alkali metal carbonate and / or cement granules may be 10 to 40%.
It is possible to adjust the pH of the entire composition within the range of% by weight, and further, there are components that act as an alkali among the group essential additive selective substances specified in the present invention.
Make a decision considering involvement. The range of the target pH value is 5 to 9.

In the present invention, the presence of the group-essential additive-selective substances in the composition is required. These substances provide nuclei for promoting the formation of flocs, and at the same time, have an adsorbing effect on the COD component which is a soluble component in the wastewater. Or, it is deeply involved in improving the dehydration property of produced flocs. Therefore, a total of 10
The content of bentonite-based soil mineral powder is 10 to 30%.
It is preferable to set the weight% to enhance the effect of adsorbing and coagulating the COD component in the wastewater. Basically, it can be added within a range that does not impair the aggregation action.

Preferred examples of the soluble aluminum compound which is one of the main components of the present invention are aluminum sulfate, aluminum chloride, polyaluminum chloride and the like. Further, as the iron salt compound of the present invention, ferrous chloride, ferrous sulfate, ferric sulfate, ferric polysulfate and the like are preferable.

The alkali metal carbonate or cement powder of the present invention includes sodium carbonate, sodium bicarbonate,
Particularly preferred are potassium carbonate, Portland cement and the like. Typical examples of the alkaline earth metal carbonates are limes, calcium carbonate, magnesium carbonate and the like.

The group essential additives specified in the present invention are compounds or substances consisting of alkaline earth metal carbonates, bentonite-based soil mineral powders, and zeolite-based powders. Typical examples of alkaline earth metal carbonates include powders and industrial compounds such as calcium carbonate and magnesium carbonate having various particle sizes.

The bentonite-based soil mineral powder is composed of silicic acid and alumina as main components, and contains a trace amount of calcium oxide, potassium oxide, magnesium oxide, etc., and is slightly alkaline in water. It is a powder or granular material to be produced, and the particle diameter of the constituent powder is usually preferably 200 mesh to 250 mesh.

Further, the zeolite-based granular material is mainly made by crushing natural soil minerals, but the main constituent components include alkali metals such as sodium and potassium and alkaline earth metals such as calcium and magnesium.
It is an aluminosilicate mineral that holds water molecules in the form of crystal water. The powder or granules used in the present invention may be any of natural or synthetic zeolite powder or granule products.

The application field of the special solid fine powdery flocculant composition of the present invention is not particularly limited, and not only civil engineering, wastewater treatment at construction sites and recycling of treated water, but also ship bilge drainage, ballast drainage, It can be used as a coagulation-sedimentation treatment agent as a pretreatment for industrial wastewater treatment such as general oil-containing wastewater, steel rolling wastewater, water-soluble cutting oil wastewater, and other biological treatment processes. In addition, it is extremely useful in a wide range of fields, such as primary treatment of concentrated wastewater, addition as a coagulant during dewatering of excess sludge and digested sludge for biological treatment, and thus contributes greatly to global environmental protection. is there.

The present invention will be described below with reference to Examples and Comparative Examples.

【Example】

Example 1 33% by weight of aluminum sulfate powder having an average particle size of about 150 μm, 22% by weight of soda ash powder having an average particle size of about 300 μm, and adjusting the particle size of the powder to about 100 μm or less. 15% by weight of cationic polymer flocculant, about 7
Bentonite powder having an average particle diameter of 5 μm was blended in a proportion of 20% by weight and 10% by weight of calcium carbonate, and uniformly mixed by a low speed mixer. The resulting mixed composition of the present invention was used as raw water for SS content of about 1200 mg / l, pH.
Agglomeration test was conducted by adding various ratios to the milky white glass polishing waste water of 6.9 and confirming the floc generation state by a jar tester (150 rpm).
Was carried out as. The evaluation was carried out based on the stirring reaction time (sec) from the addition of the flocculant to the generation of the stable floc, the diameter (mm) of the floc formed by visual observation, the Toyo Filter Paper No. The clarity (visual inspection) of the filtrate and the pH value and the like with 5A filter paper were used. The results were as shown in Table 1 below.

[0026]

[Table 1]

From the results in Table 1 above, the reaction time by stirring, the diameter of the flocs produced by visual observation, the clarity of the filtrate, the pH value, etc. are all in satisfactory conditions in each of Experimental Examples 1 to 5. It can be seen that the composition of the present invention is extremely innovative.

For comparison, in Comparative Experimental Example 1, a similar composition outside the scope of the present invention was produced in the same manner except that bentonite was excluded from the composition of Example 1 and calcium carbonate was increased instead. It was used. In Comparative Example 2, about 10% PAC solution for industrial use and a cationic polymer flocculant (0.1% solution) were used in combination, and the pH was adjusted with a sodium hydroxide solution diluted with distilled water. Further, Comparative Experimental Example 3
Then, an experiment was conducted in the same manner as in Comparative Experimental Example 2 except that the target raw water was diluted three times with tap water. Under these conditions, a test using a jar tester was performed on the same polishing waste water as used in Example 1 until flocs were generated, and the evaluation results are shown in Table 2 below.

[0029]

[Table 2]

From the results shown in Table 2 above, no sufficient effect was obtained with the flocculating composition similar to the present invention, and no flocs were found in the conventional method even if the raw water was treated as it was. The generation of flocs was observed by diluting 3 times with tap water and adjusting the pH. However, comparing these results, it can be seen that they are extremely disadvantageous compared to the method of the present invention. Example 2 25% by weight of aluminum sulfate powder having an average particle size of about 150 μm, 20% by weight of soda ash powder having an average particle size of about 300 μm, and adjusting the particle size of the powder to 100 μm or less. 15% by weight of cationic polymer flocculant, about 7
25% by weight of bentonite powder having an average particle size of 5 μm, 10% by weight of zeolite, 5% by weight of calcium carbonate
Were blended in a ratio of and mixed uniformly with a low speed mixer.
The obtained mixed composition was added to raw water at various ratios as shown in Experimental Examples 6 to 10, and the jar tester (15
(0 rpm), a flocculation test for confirming the state of floc generation was performed in the same manner as in Example 1. SS as raw water
About 1800 mg / l of oil-containing wastewater having a pH of 6.1 and having a blackish brown color was used. The evaluation was performed in the same manner as in Example 1, and the results were as shown in Table 3 below.

[0031]

[Table 3]

From the results in Table 3 above, the reaction time by stirring, the diameter of the flocs produced by visual observation, the clarity of the filtrate, the pH value, etc. were all in satisfactory conditions in Experimental Examples 6 to 10. The composition of the present invention is extremely excellent.

For comparison, in Comparative Experimental Example 4, bentonite and calcium carbonate were excluded from the composition of Example 2 as a similar composition outside the scope of the present invention, and instead the amount of the zeolite component was increased to 40% by weight. Was used in the same manner as in Example 1. In Comparative Experimental Example 5, about 10% industrial PAC solution and a cationic polymer flocculant (0.1% solution) were used together, and pH was adjusted with a caustic soda solution diluted with distilled water. Further, in Comparative Experimental Example 6, about 8% liquid sulfuric acid band solution for industrial use and a cationic polymer flocculant (0.1% solution) were used together, and pH was adjusted with a caustic soda solution diluted with distilled water.
Under these conditions, a jar tester was used to test oil-containing wastewater from the same automobile maintenance plant used in Example 2 in the same manner as in Example 2 until flock occurred.
The evaluation results are shown in Table 4 below.

[0034]

[Table 4]

From the results in Table 4 above, a sufficient effect cannot be obtained with the flocculating composition similar to the present invention, and in the conventional method, it takes a considerable time before the raw water is treated and the formation of flocs is recognized. It was necessary to adjust the pH. Therefore, comparing these results with the method of the present invention, it can be seen that the agglomerated composition of the present invention is extremely excellent in agglutination reaction effect, and that the conventional method is disadvantageous in processing time and complexity. Example 3 40% by weight of aluminum sulfate powder having an average particle size of about 150 μm, 25% by weight of soda ash powder having an average particle size of about 300 μm, and adjusting the particle size of the powder to 100 μm or less. 20% by weight of cationic polymer flocculant, about 7
Bentonite powder having an average particle size of 5 μm was blended at a ratio of 10% by weight and calcium carbonate 5% by weight, and uniformly mixed by a low speed mixer. Using the resulting mixed composition, as shown in Experimental Examples 11 to 15, milky white as raw water at various ratios, SS content of about 2200 mg / l, pH
It was added to the water-soluble cutting oil drainage of 7.5 and a performance test was carried out with a jar tester. The results are shown in Table 5 below.

[0036]

[Table 5]

From the results shown in Table 5 above, the reaction time by stirring, the diameter of the floc (mm) by visual observation, the Toyo filter paper N
o. It can be seen that the composition of the present invention is extremely epoch-making in that the clarity (visual inspection) and pH value of the filtrate with 5A filter paper are all in a satisfactory state.

For comparison, in Comparative Experimental Example 7, as a similar composition outside the scope of the present invention, the sulfuric acid band was changed to 25% by weight and soda ash powder granules were changed to 15% by weight in the composition of Example 3. The bentonite powder and granule components were excluded, and instead, calcium carbonate was blended at a ratio of 30% by weight and zeolite was blended at a ratio of 10% by weight, and a product produced in the same manner as in Example 1 was used. In Comparative Experimental Example 8, about 10% industrial PAC solution and a cationic polymer flocculant (0.1% solution) were used together, and pH was adjusted with a caustic soda solution diluted with distilled water. Further, in Comparative Experimental Example 9, a ca. 8% liquid sulfuric acid band solution for industrial use and a cationic polymer flocculant (0.1% solution) were used together, and a caustic soda solution diluted with distilled water was used to p.
H adjustment was performed. Under these conditions, the same oil cleaning wastewater from the automobile maintenance factory used in Example 3 was subjected to the same method as in Example 3 using a jar tester until flocs occurred, and the evaluation results are shown in Table 6 below. On the street.

[0039]

[Table 6]

From the results in Table 6 above, in Comparative Experimental Example 7 using the agglomerated composition similar to the present invention, stirring was performed over a period of time, and the agglomerated composition was gradually added, but it was obvious. The experiment was terminated halfway without the occurrence of flock. In Comparative Experimental Example 8 which is a conventional method, a considerable reaction time and a great deal of labor such as pH adjustment were required before the generation of minute flocs was recognized. Further, in Comparative Experimental Example 9, almost no generation of flock could be recognized. From the results of the above comparative experiment example, it is understood that it is presumed that it is further necessary to search and examine coagulation conditions depending on the state of drainage as compared with the method of the present invention. Therefore, it is recognized to be extremely disadvantageous as compared with the method of the present invention.

Example 4 30% by weight of aluminum sulfate powder having an average particle size of about 150 μm, a mixture of 15% by weight of soda ash particles having an average particle size of about 300 μm and 5% by weight of Portland cement, about 5% by weight. 15% by weight of a cationic polymer flocculant having a particle size of 100 μm or less adjusted, and 25% by weight of bentonite powder having an average particle size of about 75 μm and 10% by weight of zeolite, The mixture was mixed uniformly with a low speed mixer.

The obtained mixed composition of the present invention was used in Experimental Example 1.
Agglomeration test was carried out in the same manner as in Example 1 by adding the raw water at various ratios as shown in 6 to 20 and confirming the floc generation state by a jar tester (150 rpm). About 1000m as SS for raw water
The runoff mud drainage of the tunnel construction excavation site of g / l, pH 6.7 was used. The evaluation is performed for the items shown in Table 7 below.
The experimental results are shown in Table 7 below.

[0043]

[Table 7]

From the results in Table 7 above, the reaction time by stirring, the diameter of the flocs produced by visual observation, the clarity of the filtrate, the pH value, etc. are all in satisfactory conditions in Experimental Examples 16 to 20, It shows that the composition of the present invention has an excellent aggregation effect.

For comparison, the runoff mud drainage from the tunnel construction excavation site used in Example 4 below was used, and in Comparative Experimental Example 10, the composition of Example 4 was changed as a similar composition outside the scope of the present invention. Manufactured in the same manner as in Example 1, with 10% by weight of sulfuric acid band powder, 10% by weight of soda ash powder, 30% by weight of cationic polymer flocculant, 30% by weight of calcium carbonate and 20% by weight of bentonite. It was used.
Further, as a conventional method, in Comparative Experimental Example 11, about 10
% PAC solution, cationic polymer flocculant (0.1% solution), and caustic soda solution diluted with distilled water. Further, in Comparative Experimental Example 12, about 8% liquid sulfuric acid band solution for industrial use, a cationic polymer flocculant (0.1% solution), and a caustic soda solution diluted with distilled water were used. The experimental results are as shown in Table 8 below.

[0046]

[Table 8]

From the results shown in Table 8 above, no effective effect was obtained with the flocculating composition similar to the present invention, and in the conventional method, it took a considerable time and pH adjustment to treat the raw water to generate flocs. It took a lot of trouble. Therefore, when these results are compared with the method of the present invention, the agglutinating composition of the present invention is extremely excellent in the agglutination reaction effect, and is extremely advantageous in shortening the processing time and avoiding complexity, which are difficult to compare with the conventional method. It is clear that

Example 5 30% by weight of ferric sulfate, 25% by weight of soda ash particles having an average particle size of about 300 μm, a cationic polymer flocculant having a particle size adjusted to about 100 μm or less Bentonite powder having an average particle size of about 75 μm and 15% by weight was blended at a ratio of 20% by weight and 10% by weight of zeolite, and uniformly mixed by a low speed mixer. The obtained mixed composition of the present invention was used at various ratios as shown in Experimental Examples 21 to 25 to obtain SS content of about 1100 mg / l, pH of 6.7,
Oil concentration (n-hexane extraction substance) of about 230 mg / l was added to the steel rolling wastewater, and a jar tester (150 rp was added.
A flocculation test for confirming the flock generation state according to m) was performed in the same manner as in Example 1. Regarding the oil concentration, the measured values were 22 and 3 for Experimental Examples 21 to 25, respectively.
Removal rates ranged from about 90 to 85% at 1, 33, 33 and 35 mg / l. Other evaluation results are as shown in Table 9 below.

[0049]

[Table 9]

From the results in Table 9 above, the reaction time by stirring, the diameter of the flocs produced by visual observation, the clarity of the filtrate, the pH value, etc. were all in satisfactory conditions in each of Experimental Examples 21 to 25. . Even though the oily component concentration does not reach 5 mg / l or less on the basis of the release, it shows that the composition of the present invention is extremely excellent in effect as a flocculant. For comparison, the same steel rolling wastewater as used in Example 5 below was used, and for the three points of Comparative Experimental Examples 13 to 15, the coagulant of about 10% P, which was conventionally used, was used.
An agglutination test was performed using an AC solution, an approximately 8% sulfuric acid band solution, an approximately 38% ferric chloride solution, and a caustic soda solution diluted with a cationic polymer coagulant (0.1% solution) and distilled water. The experimental results are shown in Table 10 below.

[0051]

[Table 10]

From the results shown in Table 10 above, it takes a considerable amount of time and p to generate flocs by treating the raw water by the conventional method.
Although some labor such as H adjustment was required, the result was still insufficient. Therefore, when these results are compared with the method of the present invention, the flocculation composition of the present invention is extremely excellent in flocculation reactivity through this comparative experiment, and the processing time and the complexity are difficult to compare with the conventional method. Obviously, it is also very advantageous in avoidance.

[0053]

The special powder coagulant of the present invention is a composite composition comprising an inorganic coagulant and an auxiliary, an organic polymer coagulant, and other functional essential additives uniformly mixed. , The coagulation reactivity in the wastewater to be treated is uniform, exhibiting an extremely excellent industrial effect in terms of reaction time and work simplicity compared to the conventional method using coagulants I can do it. In particular, in the present invention, the reactivity with an organic polymer flocculant having a moderate reactivity compared to other inorganic components which act synergistically in the composition of the composition can be improved by using the organic polymer flocculant which has not been conventionally carried out. By blending the agent into the powder as a finer powder than usual, complete treatment by adding a single product to the wastewater to be treated of only the special solid fine powdery flocculant composition of the present invention was achieved, By this method, the coagulation and sedimentation treatment of various wastewaters can be very simply adopted only by a simple addition and stirring step, and greatly contributes industrially in various wastewater treatment fields.

[Procedure amendment]

[Submission date] July 12, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

[0028] For comparison, a similar composition out of the range of Comparative experimental example 1 In the present invention, excluding the bentonite out of the constituents by Example 1, by increasing the amount of calcium carbonate instead
The same thing was used except having set it as 30 weight% .
In Comparative Example 2, about 10% PAC solution for industrial use and a cationic polymer flocculant (0.1% solution) were used in combination, and the pH was adjusted with a sodium hydroxide solution diluted with distilled water. Further, in Comparative Example 3, an experiment was performed by the same method as in Comparative Example 2 except that the target raw water was diluted three times with tap water. Under these conditions, the same polishing wastewater used in Example 1 was subjected to a test with a jar tester until flocs were generated, and the evaluation results are shown in Table 2 below.

[Procedure amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction contents]

[0029]

[Table 2]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

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[0034]

[Table 4]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

For comparison, in Comparative Experimental Example 7, as a similar composition outside the scope of the present invention, 25 wt% of aluminum sulfate powder granules and soda ash powder granules 1 in the composition of Example 3 were used.
5% by weight, excluding bentonite powder component,
Instead, 30% by weight calcium sulfate and 1 zeolite
The one blended in a proportion of 0% by weight and manufactured in the same manner as in Example 1 was used. Further, Comparative Experimental Example 8 is about 1 for industrial use.
Use a 0% PAC solution and a cationic polymer flocculant (0.1% solution) together, and use a caustic soda solution diluted with distilled water.
H adjustment was performed. Further, in Comparative Experimental Example 9, about 8% liquid sulfuric acid band solution for industrial use and a cationic polymer flocculant (0.1% solution) were used together, and pH was adjusted with a caustic soda solution diluted with distilled water. Under these conditions, with respect to the oil-containing wastewater of the same automobile maintenance factory used in Example 3,
In the same manner as in Example 3, the jar tester was used until flock was generated, and the evaluation results are shown in Table 6 below.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0045

[Correction method] Change

[Correction contents]

For comparison, the runoff mud drainage from the tunnel construction excavation site used in Experimental Example 4 below was used, and in Comparative Experimental Example 10, the composition of Example 4 was changed as a similar composition outside the scope of the present invention. , Aluminum sulfate powder granules 10% by weight, soda ash powder granules 10% by weight, cationic polymer flocculant 30% by weight, calcium sulfate 30% by weight, bentonite 20% by weight and produced in the same manner as in Example 1. I used one. Further, as a conventional method, in Comparative Experimental Example 11, about 10% PAC solution for industrial use, a cationic polymer flocculant (0.1%
% Solution), a caustic soda solution diluted with distilled water was used. Furthermore, in Comparative Experimental Example 12, about 8% liquid sulfuric acid band solution for industrial use and a cationic polymer flocculant (0.1%
Solution), a caustic soda solution diluted with distilled water was used. The experimental results are as shown in Table 8 below. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 28, 1996

[Procedure amendment 2]

[Document name to be amended] Statement

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Patent application title: Special solid fine powdery flocculant composition and water treatment
Rational method ───────────────────────────────────────────────── ─────

[Procedure amendment]

[Submission date] November 6, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

The special solid fine powdery flocculant composition of the present invention can be obtained by simultaneously mixing the specific compounds constituting the present invention in powder form and uniformly mixing them. As the blending ratio of the composition, it is necessary to variably correspond to each other, but the basic composition is determined by the blending amount of the soluble aluminum or soluble iron salt compound as the flocculant component and the natural or synthetic polymer flocculant. You. An alkali metal carbonate and / or cement powder as a pH adjuster ,
As a mixing aid for the basic composition, a calcium compound,
At least two kinds of mixture selected from the group consisting of inert substances such as titanium oxide, mirabilite, diatomaceous earth and the like, carbonates of alkaline earth metals specified in the present invention, bentonite-based soil mineral powder, and zeolite powder. Is blended as an essential additive selection substance.

Claims (11)

[Claims] 1. A soluble aluminum compound or a soluble iron salt compound, a natural or synthetic polymer flocculant, etc. is used as a coagulation main agent, and an aqueous solution of the coagulation main agent is added to the alkali metal to such an extent that the pH value is near neutral. Of the above-mentioned carbonate and / or cement powder, and at least two kinds selected from the group consisting of carbonates of alkaline earth metals, bentonite-based soil mineral powder and zeolite-based powder. A special solid fine powdery flocculant composition characterized by the following: 2. The soluble aluminum compound,
The special solid fine powder coagulant composition according to claim 1, wherein any one of aluminum sulfate, aluminum chloride and polyaluminum chloride is used. 3. The special solid fine powder according to claim 1, wherein any one of ferrous chloride, ferrous sulfate, ferric sulfate, and ferric polysulfate is used as the soluble iron salt compound. Coagulant composition. 4. The special solid fine powdery flocculant composition according to any one of claims 1 to 3, wherein a natural or synthetic polymer flocculant in the form of fine powder of 100 mesh or more is used as the synthetic polymer flocculant. 5. The special solid fine powder flocculant composition according to claim 1, wherein a cationic natural or synthetic polymer flocculant is used as said synthetic polymer flocculant. 6. The natural polymer flocculant as β-1,3
The special solid fine powder coagulant composition according to any one of claims 1 to 5, wherein a coagulant obtained from an acidic polysaccharide polymer mainly containing glucan is used. 7. The special solid fine powder coagulant composition according to claim 1, wherein sodium carbonate, sodium bicarbonate, potassium carbonate or Portland cement is used as said alkali metal carbonate and / or cement powder. Stuff. 8. The alkaline earth metal carbonates,
The special solid fine powder coagulant composition according to claim 1, wherein limes, calcium carbonate, and magnesium carbonate are used. 9. The soluble aluminum compound or soluble iron salt compound is contained in an amount of 15 to 50% by weight, and the natural or synthetic polymer flocculant is added in an amount of 0.5 to 25% by weight based on 100% of the total weight of the composition. %, 10 to 40% by weight of alkali metal carbonate and / or cement powder,
10. A composition is prepared by uniformly mixing 10 to 40% by weight as a mixture of at least two kinds selected from the group consisting of alkaline earth metal carbonates, bentonite-based soil mineral granules, and zeolite-based granules. The special solid fine powdery flocculant composition according to any one of 1 to 8. 10. The bentonite-based soil mineral powder and granules 1
The special solid fine powder coagulant composition according to claim 1, which comprises 0 to 30% by weight. 11. A wastewater treatment method, which comprises adding the special solid fine powdery flocculant composition according to any one of the above claims to wastewater to be treated and causing the flocculation reaction with stirring. .