TW201739701A - A method for vitrification of contaminated sediments especially forming a harmless vitrified solid through an addition of a promoter and a heating means - Google Patents

Abstract

A method for vitrification of contaminated sediments, comprising: adding a vitrification promoter (G0) to a contaminated sediment (S0) and thoroughly mixing to obtain a contaminated sediment that has been blended with a vitrification promoter (S1); and a heating means for heating the contaminated sediment (S1) obtained above to form a harmless vitrified solid (Sg); wherein the addition ratio of the vitrification promoter to the contaminated sediment is in the range of 1:50 to 50:1 ; The vitrification promoter is at least one selected from the group consisting of alkali metal oxides, alkaline earth metal oxides, glass sands, iron sands, and mixtures thereof; and the first heating temperature is in the range of 500DEG C to 2000DEG C.

Description

Polluted sediment vitrification method

The invention relates to a method for vitrifying contaminated sediment, in particular to a method for directly adding a vitrification promoter to a contaminated sediment at a pollution site, and heating by a heating means to form a harmless vitrified solid. A method for vitrifying contaminated sediment.

The mud pollution situation in Taiwan is quite serious. A number of organic pollutants and heavy metal pollution concentrations are among the first serious areas in the world. Due to the large difference in the distribution of pollutants in the sediment, the treatment and treatment techniques for the contaminated sediment are relatively difficult to select and implement, especially for local high pollution. The remediation of the sediment is particularly difficult.

Although, in many literatures, it is proposed to use a technical method of directly vitrifying the local high-contamination component sediment at the contaminated site to improve the cost-effectiveness of the contaminated sediment treatment, but the environmental conditions of the contaminated site are different, regardless of It has been unsatisfactory in terms of processing costs or processing power.

For example, when using the contaminated sediment vitrification method of the prior art, it is usually necessary to dredge the contaminated site first, and then transport the contaminated sediment obtained by dredging to a specific treatment site, and then vitrify the contaminated sediment. deal with. In general, since about 80% to 90% by mass of the contaminated sediment is a small particle contaminated sediment having a particle size of 30 μm or less, when using such an existing vitrification treatment technique, When dealing with contaminated sediment, it is not only easy to cause a large amount of small particle sediment suspension and loss during the dredging process, but also often leads to failure to achieve remediation effect or failure. Therefore, how to avoid the loss of small particles contaminated sediment is a very important issue.

In addition, in other prior documents, it is also described that, for example, two electrodes having a high potential difference are inserted into a contaminated sediment to be treated, a plasma having a temperature of up to 3000 ° C is applied, and the sediment is heated to be in a molten state, and placed. After cooling, solid matter is formed, thereby rapidly eliminating organic pollutants and high-temperature heat treatment technology for completing the treatment.

Although the use of such plasma processing technology can utilize high temperature to rapidly coke the contaminated sludge to remove contaminants, it is obviously a high energy and high cost processing technology due to the need to produce plasma. In addition to being unfavorable to economic benefits, for example, in the process of treating contaminated sediments, organic components sometimes escape toxic gases due to the high temperature during plasma treatment, which may adversely affect the health of workers. The doubts that caused the second public hazard.

Therefore, how to develop a problem that not only can solve the above-mentioned conventional technology, such as high energy consumption, high cost, high operational difficulty, inability to effectively remove pollutants, endanger the health of workers, and cause secondary pollution, and can achieve stability. The novel technology of sludge removal, effective removal of pollutants, and easy handling of contaminated sediment at the current site is an urgent issue for the relevant industry.

In view of the above, the present inventors have diligently studied and searched for various possible solutions for solving the above-mentioned problems of the conventional technology, thereby developing a problem that can not only improve the above-mentioned problems of the conventional technology, but also low energy consumption, cost saving, and operation. The present invention has been completed by a novel contaminated sludge treatment technique which is easy, convenient for current site operations, capable of quickly and efficiently treating contaminants, safe and not harmful to health, and which does not cause secondary environmental hazards.

That is, according to one aspect of the present invention, a method for vitrifying a contaminated sediment comprising: adding a vitrification promoter (G0) to a contaminated sediment (S0) and thoroughly mixing to obtain a glassy promoted blend is provided. a contaminated sediment (S1) of the agent; and heating the contaminated sediment (S1) obtained by the first heating means, and forming a harmless vitrified solid after the first heating time (T1) at the first heating temperature (Sg).

In summary, by using the contaminated sediment vitrification method provided by the present invention, it is possible to easily in situ vitrification the bottom mud of the locally highly polluted block at the contaminated site. For example, by using the contaminated sediment vitrification technology of the present invention, electromagnetic induction heating is applied to the surface sediment contaminants, so that the sediment can be rapidly vitrified directly at the current site at 1400 ° C, except that the sediment can be made up to 97.0. The quality of the heavy metal is -100.0% by mass, in addition to the stability of the heavy metal, and the toxic dissolution test of the vitrified glass by the electromagnetic induction heating can reach the compliance with the regulatory standards; in particular, when the appropriate amount of glass sand is further added, The heating temperature for vitrification is further lowered to 1000 ° C or below.

Furthermore, according to the vitrification method of the contaminated sediment according to the present invention, at least: (1) the local excavation dredging can be reduced to avoid a large amount of suspension or loss of small particle sediment; (2) drainage or pumping is suitable. Dry the upper water body to reduce water content, and can be vitrified directly under water; (3) By adding iron sand as an auxiliary means, the time required for the heating of the vitrification of the bottom mud can be shortened; (4) by adding glass Sand can shorten the heating temperature of vitrification of the bottom mud, and it can be confirmed that vitrification can be easily achieved at medium temperature and low temperature; (5) even if the sediment with high water content without long-time drying can be applied, The vitrification of the bottom mud greatly improves the remarkable and outstanding effects of industrial utilization.

Hereinafter, the present invention will be described in detail with reference to the embodiments and the drawings. However, the following description is merely illustrative, and is not intended to limit the scope of the invention. The scientific and technical terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the invention pertains, unless otherwise defined herein.

In this context, the numerical values and parameters used to define the scope of the invention intrinsically inevitably contain standard deviations due to individual test methods, and are therefore mostly expressed in approximate numerical values, although in specific embodiments Relevant values that are presented as accurately as possible. As used herein, "about" generally refers to the consideration of those of ordinary skill in the art to which the invention pertains, and generally means that the actual value falls within an acceptable standard error of the average value, for example, the actual value is in one Within ±10%, ±5%, ±1%, or ±0.5% of a particular value or range.

First, the water content of the contaminated sludge which is suitable for the treatment by the vitrification method of the present invention is not particularly limited, and may be, for example, 80% or less. For example, the moisture content of the contaminated sediment is preferably 70% or less; more preferably 60% or less, more desirably 55% or less, particularly preferably 50% or less, and most preferably 45% or less.

Further, the type of the contaminant contained in the contaminated sediment is not particularly limited, and may be, for example, an organic contaminant or an inorganic contaminant. For example, the inorganic contaminant may be at least one selected from the group consisting of arsenic, cadmium, chromium, copper, mercury, nickel, lead, zinc, and mixtures thereof.

In addition, the organic pollutants may be polychlorinated biphenyls, dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), phthalic acid butyl phthalate. Benzoyl benzyl ester (BBP), n-dioctyl phthalate (DNOP), di(2-ethylhexyl) phthalate (DEHP), diphenyl ether compound polybrominated diphenyl ether (PBDEs), PAEs At least one selected from the group consisting of PAHs, PCBs, decabromodiphenyl ether (BDE-209), and mixtures thereof.

A method for vitrifying a contaminated sediment according to the present invention comprises: a vitrification accelerator adding step of adding a vitrification promoter (G0) to the contaminated sediment (S0), followed by heating to T ° C and at the temperature Holding for a second second (sec) to form a harmless vitrified solid (Sg); wherein the vitrification promoter is selected from the group consisting of alkali metal oxides, alkaline earth metal oxides, glass sand, iron sand, and mixtures thereof At least one of; T (°C) and t (sec) satisfy the following relationship (1), (2), (3): T = 360.27 ✕ ln(t+1) + 7.1218 ------ -------------------------------- (1) 500 ≦ T ≦ 2000 ---------- ---------------------------- (2) 0 ≦ t ≦ 1000 -------------- ------------------------ (3) The total addition amount (Gw) of the vitrification promoter relative to the total of the contaminated sediment (Sw) In terms of quantity, when Timing, Sw: Gw is in the range of 100:5 to 5:100.

Moreover, in some specific embodiments of the embodiment of the present invention, the ratio of the addition of the vitrification promoter to the contaminated sludge is not particularly limited. For example, the Gw:Sw is preferably at 1. Range of 40 to 40:1; more preferably in the range of 1:30 to 30:1; more preferably in the range of 1:20 to 20:1; particularly preferably in the range of 1:10 to 10:1 The optimum is in the range of 1:5 to 5:1; most preferably in the range of 1:2 to 2:1.

In addition, according to the contaminated sludge vitrification method of the present invention, the vitrification promoter is not particularly limited, and for example, it may be composed of glass sand, iron sand, sodium oxide, calcium oxide, magnesium oxide, or aluminum oxide. At least one of the selected groups. For example, in certain specific embodiments, the vitrification promoter may be composed of glass sand and iron sand; or may be composed of an alkali metal oxide, an alkaline earth metal oxide, or iron sand. Further, the vitrification promoter may further include at least one of sodium oxide (Na ₂ O), calcium oxide (CaO), and a mixture thereof.

In addition, according to the vitrification method of the contaminated sediment of the present invention, the contaminated sediment can be vitrified to form any of quartz glass, soda samarium glass, sodium borosilicate glass, lead oxidized glass, aluminum bismuth glass, and oxide glass. A harmless vitrified solid; wherein the removal rate of the polychlorinated biphenyl contained in the contaminated sediment is in the range of 90% to 100%. The stability of the harmless vitrified solid is in the range of 97.0 to 100.0%.

Further, in some specific embodiments of the embodiment of the present invention, the first heating temperature is not particularly limited, and may be, for example, in the range of 200 ° C to 2500 ° C. For example, the heating temperature is preferably in the range of 300 ° C to 2200 ° C; more preferably in the range of 500 ° C to 2000 ° C; more preferably in the range of 600 ° C to 1800 ° C; Jia is in the range of 700 ° C ~ 1700 ° C; the best is in the range of 800 ° C ~ 1600 ° C

Moreover, in some specific embodiments of the embodiment of the present invention, the heating time of the unit sludge weight is not particularly limited, and may be, for example, 0.001 sec / gram of contaminated sediment to 60.00 sec / gram. The scope of contaminated sediment. For example, the heating time per unit weight of the sludge is preferably in the range of 0.001 sec / gram of contaminated sediment to 55.00 sec / gram of contaminated sediment; more preferably 0.10 sec / gram of contaminated sediment to 50.00 sec / The range of gram contaminated sediment; more preferably in the range of 0.20 sec / gram of contaminated sediment to 40.00 sec / gram of contaminated sediment; particularly preferably in the range of 0.30 sec / gram of contaminated sediment to 30.000 sec / gram of contaminated sediment Preferably, it is in the range of 0.40 sec / gram of contaminated sediment to 25.00 sec / gram of contaminated sediment; most preferably in the range of 0.50 sec / gram of contaminated sediment to 20.00 sec / gram of contaminated sediment.

Secondly, in some specific embodiments of the embodiment of the present invention, the contaminated sludge vitrification method of the present invention may further add a curing accelerator (H1), the curing accelerator (H1) and the pollution. The addition ratio (H1: S1) of the sediment (S1) is not particularly limited, and may be, for example, in the range of 1:50 to 50:1. For example, the addition ratio (H1:S1) is preferably in the range of 1:40 to 40:1; more preferably in the range of 1:30 to 30:1; more preferably in the range of 1:20 to 20: Range of 1; particularly preferably in the range of 1:10 to 10:1; optimally in the range of 1:5 to 5:1; ideally in the range of 1:2 to 2:1;

Furthermore, according to certain specific embodiments of the embodiment of the present invention, the heating of the contaminated sediment (S1) in the vitrified vitrification method of the present invention may be performed by electromagnetic induction.

Further, the heating condition of the contaminated sediment (S1) is not particularly limited, and for example, it may be carried out at a current of 50 A or more and a voltage of 110 to 380 V.

Moreover, in the method for vitrifying the contaminated sediment of the present invention, the harmless vitrified solid material comprises quartz glass, soda silicate glass, sodium borosilicate glass, lead oxidized glass, aluminum bismuth glass, oxide glass, and mixtures thereof. At least one of the selected ones.

Moreover, according to some specific embodiments of the embodiments of the present invention, the curing accelerator (H1) is derived from low temperature glass sand, medium temperature glass sand, high temperature glass sand, iron sand, sodium oxide, calcium oxide, magnesium oxide, At least one selected from the group consisting of alumina.

The embodiments of the present invention will be described and illustrated in detail in the detailed description of the embodiments of the invention. The scope of the present invention is not limited in any way by the following specific examples, but the scope of the present invention is not intended to be limited.

In addition, it is to be understood by those skilled in the art that the present invention is not limited to the examples, and the same or equivalent functions and steps are used to achieve the invention. "The heating temperature (T) and the heating time (t) of the bottom vitrification"

First, a contaminated sediment sample was taken at the bottom of the contaminated river using a column sampler. Sediment characteristics of moisture content, pollutant content, heavy metal element content, pH value, particle size, etc. of the known sediments of the known weights collected from the confluence of the Errenxi, the five-air bridge and the second-tier bridge analysis. In addition, for each contaminated sediment, the electromagnetic induction device made by the laboratory of the Environmental Engineering Research Institute of ZTE University is used, and the heating is not performed in the same coil number, different current magnitude and different high and low frequencies, and the glass is heated. Under the conditions of the current, the heating time, etc., the vitrification operation parameters of the bottom mud.

According to the test, in general, the preferred heating means for vitrification of the bottom mud is a high frequency generator and an induction coil using an alternating current of a voltage of 110-380 Volt and a current of 1.0 KHz or more with a current of 50 A or more. In particular, with a voltage of 380 volts, a current of 65 amps, and a heating temperature of up to 1450 ° C, it is usually possible to complete the vitrification of the sediment in 65 seconds.

The relationship between the average temperature of the three heatings under fixed conditions as a function of time as described above is shown in FIG. In the logarithmic mode, the heating temperature (T) and the heating time (t) are simulated to obtain a curve equation with R ² of 0.9903; that is, the T (°C) and t (sec) satisfy the following heating temperature time relationship ( 1) . T = 360.27 ✕ ln(t+1) + 7.1218 -------------------------------------- (1)

In addition, in actual operation, it is preferable that the heating temperature (T) and the heating time (t) further satisfy the upper and lower limits of T (°C) represented by the following equations (2) and (3), and The upper and lower limits of t (sec). 500 ≦ T ≦ 2000 -------------------------------------- (2) 0 ≦ t ≦ 1000 -------------------------------------- (3)

The analysis of the heavy metal element content was carried out in accordance with the "Rapid Screening Method for Elemental Concentration in Soil and Sediment - Portable X-Ray Fluorescence Spectrometer Method" (NIEA S322.60C) published by the Environmental Protection Agency of the Executive Yuan.

According to the test analysis results, after removing water in the sediment, the average content of calcium carbonate is about 17.8%, the average content of iron oxide is about 2.1%, the average content of manganese oxide is about 0.03%, and the average content of organic matter is about 1.8%, organic matter. The average content is about 0.65%, the soil texture is mainly sand, and the average content of glutinous grains and sand is about 95%.

<<Example 1 to Example 9>> (Medium temperature vitrification method)

First, a contaminated sediment sample was taken at the bottom of the contaminated river using a column sampler. Analysis of sediment characteristics of water content, pollutant content, and heavy metal element content of contaminated sediments of known weights collected from the confluence of Errenxi, Wukongqiao, and the second-tier bridge. The analysis of the heavy metal element content was carried out in accordance with the "Rapid Screening Method for Elemental Concentration in Soil and Sediment - Portable X-Ray Fluorescence Spectrometer Method" (NIEA S322.60C) published by the Environmental Protection Agency of the Executive Yuan. The elemental analysis results of the contaminated sediment are shown in Table 1.

Further, the addition amount of the vitrification promoter to be added to the contaminated sediment, and the composition thereof are also shown in Table 1. Then, according to the above-mentioned heating temperature (T), heating time (t) curve equation (1), and equations (2), (3), the upper and lower limits of T (°C), and t Upper and lower limits of (sec): T = 360.27 ✕ ln(t+1) + 7.1218 ------------------------------ -------- (1) 500 ≦ T ≦ 2000 ---------------------------------- ---- (2) 0 ≦ t ≦ 1000 -------------------------------------- (3) The bottoming vitrification operation parameters such as the heating temperature and the heating time required for the vitrification of each contaminated bottom mud in the state of the medium temperature heating and vitrification are obtained, and are shown in Table 1.

Then, in each of the contaminated sediments (S0) at the confluence of the Errenxi, the Wukongqiao, and the second-tier bridge, the glassing accelerator (G0) is directly injected by a pressurized pump and thoroughly mixed. Contaminated sediment (S1) blended with a vitrification promoter.

Then, according to the above-mentioned glassing heating conditions and the like, the electromagnetic sludge is used to heat the obtained sludge (S1) according to the vitrification operation parameters shown in Table 2, After maintaining the heating time as shown in Table 1 at a temperature in the range of 800 ° C to 1000 ° C, a harmless vitrified solid (Sg) formed from the contaminated sediment (S1) was obtained.

In addition, during the electromagnetic induction heating to form the vitrification period, according to the "Airborne particulate pollutant detection method - high sampling method" (NIEA A102.12A) announced by the Environmental Protection Agency of the Executive Yuan, the sampler collects quickly. Air sample above the vitrification operation. After the completion of the vitrification operation, the collected samples are subjected to chemical quantitative analysis to obtain various types of pollutants such as air pollutant type and content, total suspended solid content, polychlorinated biphenyls, and polycyclic aromatic hydrocarbons. The content and the like. Sampling and analysis of the above polychlorinated biphenyls and analysis of polycyclic aromatic hydrocarbon contaminants are carried out in the same manner as described above.

Then, refer to the "Business Waste Toxicity Characteristic Dissolution Procedure" (NIEA R201.14C) published by the Environmental Protection Institute to conduct a toxic dissolution test on the harmless vitrified solid material (Sg) obtained above to analyze the possible dissolution of the glass sulphate. substance. The results of the toxic dissolution test are reported in Table 1.

The specific analysis procedure is as follows. First, the harmless vitrified solid (Sg) is pulverized and then directly extracted. That is, take 5.0 g of the harmless vitrified solid (Sg) sample and add 96.5 mL of reagent water, cover it, stir vigorously for 5 min with a magnetic stirrer, and measure the pH of the solution. If the pH is less than 5, use extract A (pH 4.93 ± 0.05); if the pH is greater than 5, add 3.5 mL of 1.0 N hydrochloric acid solution, stir evenly and heat to 50 ° C for 10 min. The pH of the solution is measured after cooling to room temperature. If the pH is still less than 5, the extract A is used. Conversely, if the pH is greater than 5, the extract B (pH 2.88 ± 0.05) is used.

The extraction steps are briefly described as follows: 100 g of the sample is placed in an extraction vessel, 20 times the sample weight of the extract is slowly added, the cap is screwed, placed in a rotating device, rotated at 30 rpm for 18 hours, and the room temperature is maintained at 23 ° C. . During the extraction process, the cap is opened every 15 min, 30 min or 1.0 hr to release the gas. Then, it was filtered through a 0.6-0.8 μm glass fiber filter paper, and then subjected to the above chemical analysis method for digestion of heavy metal and ICP-OES analysis. Table 2 (medium temperature vitrification)

From the test data described in Table 1, it can be confirmed that Embodiment 1 to Example 9 are carried out by adding a suitable amount of glass sand and/or iron sand to the contaminated sediment according to the method for vitrifying the contaminated sediment of the present invention. Safe, stable and harmless vitrified sediments can be obtained in a very short time of 8 seconds to 15 seconds at a temperature of 800 ° C to 1000 ° C, and meet the general business waste standards.

<<Example 10 to Example 16>> (High Temperature Vitrification Method)

First, a contaminated sediment sample was taken at the bottom of the contaminated river using a column sampler. In the same manner as in the first embodiment to the ninth embodiment, the moisture content, the pollutant content and the heavy metal element content of the known sediments of the known weights collected from the confluence of the Errenxi, the Wukongqiao and the second-story bridge are analyzed. The characteristics of the bottom mud are analyzed, and the operating parameters such as the current size and heating time required for vitrification of each contaminated sediment in the high-temperature heating vitrification state are determined.

In the same manner as in the first to the ninth embodiments, the analysis of the heavy metal element content is referred to as the "Rapid Screening Method for Elemental Concentration in Soil and Sediment - Portable X-Ray Fluorescence Spectrometer Analysis" (NIEA) published by the Environmental Protection Agency of the Executive Yuan. S322.60C).

Then, in each of the contaminated sediments (S0) of the confluence of the Errenxi, the Wukongqiao, and the second-tier bridge, the specified addition amount of the composition shown in Table 1 is directly injected by the pressurized pump. The vitrification promoter (G0) is thoroughly mixed to obtain a contaminated sludge (S1) to which a vitrification promoter has been blended.

Then, according to the above-mentioned heating temperature (T), heating time (t) curve equation (1), and equations (2), (3), the upper and lower limits of T (°C), and t Upper and lower limits of (sec): T = 360.27 ✕ ln(t+1) + 7.1218 ------------------------------ -------- (1) 500 ≦ T ≦ 2000 ---------------------------------- ---- (2) 0 ≦ t ≦ 1000 -------------------------------------- (3) The bottoming vitrification operation parameters such as the heating temperature and the heating time required for the vitrification of each contaminated bottom mud in the state of the intermediate temperature heating vitrification are obtained, and are shown in Table 2.

Next, using the electromagnetic induction device, the obtained contaminated sediment (S1) is heated according to the vitrification operation parameters shown in Table 3, and maintained at a temperature ranging from 1200 ° C to 1600 ° C. After the heating time shown in Table 2, a harmless vitrified solid (Sg) formed from the contaminated sediment (S1) was obtained.

In addition, in the same manner as in the first to the ninth embodiments, the electromagnetic induction heating is performed to form a vitrification period, and according to the "Environmental Particle Contaminant Detection Method - High Sampling Method" announced by the Environmental Protection Agency of the Executive Yuan. (NIEA A102.12A) A sampler is used to collect air samples above the rapid vitrification operation. After the completion of the vitrification operation, the collected samples are subjected to chemical quantitative analysis to obtain various types of pollutants such as air pollutant type and content, total suspended solid content, polychlorinated biphenyls, and polycyclic aromatic hydrocarbons. The content and the like. The results are shown in Table 2.

The sampling and analysis of the above polychlorinated biphenyls and the analysis of the polycyclic aromatic hydrocarbon contaminants were carried out in the same manner as in Example 1.

Then, in the same manner as in the first to the ninth embodiments, the "industry waste toxicity characteristic elution procedure" (NIEA R201.14C) announced by the environmental inspection office was carried out, and the harmless vitrified solid matter (Sg) obtained above was subjected to the above. A toxic dissolution test to analyze the substances that may be dissolved by the glazing. The results of the toxic dissolution test are shown in Table 2.

Table 2 (high temperature vitrification)

From the test data described in Table 2 above, it can be confirmed that Embodiment 10 to Example 16 are carried out by adding a suitable amount of glass sand and/or iron sand to the contaminated sediment according to the method for vitrifying the contaminated sludge of the present invention. At a temperature of 1400 ° C, a safe, stable and harmless vitrified sediment can be obtained in a very short time of 46.8 seconds, and meets the general business waste standards.

In summary, according to Tables 1 and 2 above, it can be confirmed that the above-mentioned contaminated sediment vitrification method using the novel contaminated sludge treatment technology disclosed by the present invention can not only improve the above-mentioned conventional techniques. The problem is low energy consumption, cost-saving, easy to operate, convenient for current site operations, fast and effective treatment of pollutants, safe and not harmful to health, and excellent environmental pollution.

Furthermore, according to the vitrification method of the contaminated sediment according to the present invention, at least: (1) the local excavation dredging can be reduced to avoid a large amount of suspension or loss of small particle sediment; (2) drainage or pumping is suitable. Dry the upper water body to reduce water content, and can be vitrified directly under water; (3) By adding iron sand as an auxiliary means, the time required for the heating of the vitrification of the bottom mud can be shortened; (4) by adding glass Sand can shorten the heating temperature of vitrification of the bottom mud, and it can be confirmed that vitrification can be easily achieved at medium temperature and low temperature; (5) even if the sediment with high water content without long-time drying can be applied, The vitrification of the bottom mud greatly improves the remarkable and outstanding effects of industrial utilization.

In summary, the content of the present invention has been exemplified by the above embodiments, but the present invention is not limited to the embodiments. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention; for example, combining or modifying the technical contents exemplified in the foregoing embodiments. As a new embodiment, these embodiments are of course considered as belonging to the present invention. Therefore, the scope of protection to be covered in this case also includes the scope of the patent application described below and the scope defined by it.

Then, in each of the contaminated sediments (S0) of the confluence of the Errenxi, the Wukongqiao and the second-tier bridge, the vitrification promoter (G0) is directly injected by pressurized pumping and fully mixed to obtain the blended Contaminated sediment (S1) mixed with a vitrification promoter. The amount of the glass transition promoter added and its composition are shown in Table 1.

no.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a graph showing the relationship between the glass transition heating temperature and the temperature time between heatings in accordance with a specific embodiment of the present invention.

no

Claims (10)

A method for vitrifying a contaminated sediment, comprising: a glassing accelerator adding step of adding a vitrification promoter to the contaminated sludge, followed by heating to T ° C and maintaining at the temperature for t seconds (sec) a harmless vitrified solid (Sg); wherein the vitrification promoter is at least one selected from the group consisting of alkali metal oxides, alkaline earth metal oxides, glass sand, iron sand, and mixtures thereof; ) and t (sec) satisfy the following relations (1), (2), (3): T = 360.27 ✕ ln(t+1) + 7.1218 --------------- ----------------------- (1) 500 ≦ T ≦ 2000 ------------------- ------------------- (2) 0 ≦ t ≦ 1000 ----------------------- --------------- (3) The total addition amount (Gw) of the vitrification accelerator is compared with the total amount of the contaminated sediment (Sw), when weighted, Sw: Gw is in the range of 100:5 to 5:100. The method for vitrifying a contaminated sludge according to claim 1, wherein the vitrification promoter comprises at least one selected from the group consisting of glass sand, iron sand, sodium oxide, calcium oxide, magnesium oxide, and aluminum oxide. The method for vitrifying a contaminated sediment according to claim 1, wherein the vitrification promoter is composed of glass sand and iron sand. The method for vitrifying a contaminated sediment according to claim 1, wherein the vitrification promoter is composed of an alkali metal oxide, an alkaline earth metal oxide, and iron sand. The method for vitrifying a contaminated sludge according to claim 1, wherein the vitrification promoter comprises at least one of sodium oxide (Na ₂ O), calcium oxide (CaO), and a mixture thereof. The method for vitrifying a contaminated sediment as recited in claim 1 or 2, wherein the contaminated sediment is vitrified to form quartz glass, soda silicate glass, sodium borosilicate glass, lead oxidized glass, aluminum bismuth glass, or oxide glass. Any of the harmless vitrified solids. The method for vitrifying a contaminated sediment as recited in claim 1 or 2, wherein the removal rate of the polychlorinated biphenyl contained in the contaminated sediment is in the range of 90% to 100%. The method for vitrifying a contaminated sediment according to claim 1 or 2, wherein the contaminated sediment has a water content of 80% or less. The method for vitrifying a contaminated sediment as recited in claim 1 or 2, wherein the pollutant contained in the contaminated sediment comprises arsenic, cadmium, chromium, copper, mercury, nickel, lead, zinc, polychlorinated biphenyls. At least one of them. The method for vitrifying a contaminated sediment according to claim 1 or 2, wherein the stability of the harmless vitrified solid is in the range of 97.0 to 100.0%.