TW202007654A - Organic wastewater treatmeat apparatus and treating method thereof - Google Patents

Abstract

An organic wastewater treatment apparatus including a reaction section, a waste water supply section, and an oxidant supply section is provided. The reaction section has at least one reaction tank for treating wastewater containing organic substances. The reaction tank has at least one composite photocatalyst that absorbs wavelengths in the visible light range, and process photocatalysis to decomposes or cracks organic substances contained in the wastewater. The composite photocatalyst includes at least one porous catalyst carrier and a plurality of nanoparticles. The nanoparticles containing a plurality of nano metal particles and/or a plurality of nano metal oxide particles. The waste water supply section feeds the waste water into the reaction tank and the oxidant supply section feeds at least one oxidant into the reaction tank. A treating method of organic wastewater is also provided.

Description

Organic wastewater treatment device and treatment method

The invention relates to a waste water treatment device, and in particular to an organic waste water treatment device and a treatment method thereof.

The shortage and shortage of water resources are the dilemma that human beings will face together, so they need to be solved and overcome urgently. In addition to increasing open source water resources, in addition to saving water in terms of savings, water recycling is regarded as an important part. After proper treatment of waste water, it can be recycled and reused according to the difference of the used objects. In the early days, due to treatment technology and cost constraints, most of them achieved the purpose of recovery and reuse by removing particles and inorganic ions in water.

However, the wastewater contains a large amount of refractory high-concentration organic substances that will lead to environmental pollution. With the rise of environmental awareness, the treatment and recovery of organic wastewater have also been paid more and more attention. Therefore, making an organic substance that can effectively remove the organic substances contained in the wastewater The waste water treatment device has become an urgent problem to be solved.

The invention provides an organic wastewater treatment device, which can effectively remove organic substances in organic wastewater.

The invention provides an organic wastewater treatment method, which can effectively remove organic substances in organic wastewater.

The invention provides an organic waste water treatment device including a reaction part, a waste water supply part and an oxidant supply part. The reaction part has at least one reaction tank for treating wastewater containing organic substances, wherein the reaction tank has at least one composite photocatalyst, which absorbs wavelengths in the visible light range, while photocatalytically decomposing or cracking organic substances contained in the wastewater. The composite photocatalyst includes at least one porous catalyst carrier and a plurality of nano particles. The porosity of the catalyst carrier is greater than or equal to 50% and less than 100%. A plurality of nano-particles are mounted on a catalyst carrier, the nano-particles include a plurality of nano-metal particles and/or a plurality of nano-metal oxide particles, and the weight content of the nano-particles in the composite photocatalyst It is 1000 ppm to 4000 ppm. The waste water supply unit supplies waste water into the reaction tank. The oxidant supply part supplies at least one oxidant into the reaction tank, and the supply amount of the oxidant and the treatment amount of wastewater have a weight percentage X, and the weight percentage X satisfies the relationship: 0% <X <10%.

The invention provides an organic wastewater treatment method. The organic wastewater treatment method includes the following steps. Provide the aforementioned organic wastewater treatment device. Waste water is injected into the reaction tank from the waste water supply unit. The oxidant is injected into the reaction tank from the oxidant supply part. The residence time of wastewater in the reaction tank is at least 30 minutes.

Based on the above, the organic wastewater treatment device of the present invention has a catalyst carrier, which can make the composite photocatalyst easier to separate from water. Therefore, compared with the reaction in which the composite photocatalyst exists in the wastewater in a nearly homogeneous state, the present invention It will be more advantageous in the practical application of organic waste water recycling. In addition, the composite photocatalyst of the present invention can absorb wavelengths in the visible light range to produce good catalyst catalytic efficiency, and rapidly decompose organic pollutants containing carbon, hydrogen and oxygen. The utility model has the advantages of high stability, simple operation and low cost, and can be recycled and used repeatedly, without secondary pollution, and effectively removes organic substances in organic wastewater.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

Hereinafter, the present invention will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not limiting. As used herein, unless the content clearly indicates, the singular forms "a", "an", and "the" are intended to include the plural forms, including "at least one." "Or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It should also be understood that when used in this specification, the term "comprising" and/or "comprising" specifies the features, regions, wholes, steps, operations, presence of elements and/or components, but does not exclude one or more The presence or addition of other features, regions as a whole, steps, operations, elements, components, and/or combinations thereof.

As used herein, "about", "approximately", or "substantially" includes the stated value and the average value within an acceptable deviation range for a particular value determined by one of ordinary skill in the art, taking into account the measurements and A certain amount of measurement-related errors (ie, measurement system limitations). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, as used herein, "about", "approximately", or "substantially" can be based on optical properties, reactive properties, or other properties to select a more acceptable range of deviation or standard deviation, and one standard deviation can be applied to all properties .

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology and the present invention, and will not be interpreted as idealized or excessive Formal meaning unless explicitly defined as such in this article.

FIG. 1 is a schematic diagram of an organic wastewater treatment device according to an embodiment of the invention. 2 is a schematic diagram of a composite photocatalyst according to an embodiment of the invention. Referring to FIGS. 1 and 2, the organic wastewater treatment apparatus 100 of this embodiment includes a reaction unit 110, a wastewater supply unit 120 and an oxidant supply unit 130. For the description of the waste water supply unit 120, refer to the subsequent description.

The reaction part 110 has at least one reaction tank 111 for treating wastewater containing organic substances. The organic substances in the wastewater may be organic acids, alcohols, dyes or pigments. For example, the organic acid may be ethylenediaminetetraacetic acid (EDTA), acetic acid, organic acids commonly found in wastewater from the photovoltaic industry, organic acids commonly found in wastewater from other semiconductor industries, or common in wastewater from other industries The organic acids and alcohols can be isopropanol (IPA), ethanol, alcohols commonly found in wastewater from the photovoltaic industry, alcohols commonly found in wastewater from other semiconductor industries, or alcohols commonly found in wastewater from other industries, Or the wastewater in any industry contains the aforementioned organic substances, but the invention is not limited to this. The source of the waste water may be organic waste water generated by industries in the area where the organic waste water treatment device 100 is located or organic waste water generated by industries located outside the area where the organic waste water treatment device 100 is located and the organic waste water is transported through a transportation device (not shown) To the area where the organic wastewater treatment device 100 is located (for example: to the wastewater supply unit 120). Wherein, the transportation device (not shown) may include pipelines, automobiles, ships, or other suitable transportation devices. The number of reaction tanks 111 in the reaction part 110 can be adjusted according to design requirements. For example, the reaction part 110 may also have two reaction tanks 111, but the invention is not limited thereto. The reaction tank 111 may be, for example, a fixed bed reactor (FBR), but is not limited thereto. Furthermore, in order to increase the speed of the organic waste water entering the reaction tank 111 or transferring it to a higher position in the reaction tank 111, a pump P can be selectively added between the reaction tank 111 and the waste water supply part 120, as shown in FIG. 1 for example.

The reaction tank 111 has at least one composite photocatalyst 114. The number of composite photocatalysts 114 in the reaction part 110 can be adjusted according to design requirements, and is not limited in the present invention. In some embodiments, the bulk density of the composite photocatalyst 114 and the waste water in the reaction part 110 is about 0.5 g/ml to 0.6 g/ml, but it is not limited thereto. The composite photocatalyst 114 includes at least one porous catalyst carrier 114a (shown in FIG. 2) and a plurality of nano particles 114b (shown in FIG. 2).

The catalyst carrier 114a has a porosity. The porosity is defined as the percentage of the volume of the pores in the porous catalyst carrier 114a to the total volume of the porous catalyst carrier 114a. When the porous catalyst carrier 114a The higher the porosity, the greater the amount of wastewater that can be impregnated between the pores of the porous catalyst carrier 114a, that is, the higher the porosity, the more wastewater containing organic substances can enter the catalyst The reaction between the pores of the carrier 114a improves the reaction efficiency. The porous catalyst carrier 114a having a porosity of 50% or more and less than 100% is preferable. The porous catalyst carrier 114a is, for example, activated carbon, diatomite, alumina, zeolite, gel, manganese sand, cement, polymer water-absorbing material (such as sponge), water-absorbing coating material, but the invention is not limited thereto . In addition, since the composite photocatalyst 114 of the present invention has a porous catalyst carrier 114a, the composite photocatalyst 114 can be easily separated from water. Therefore, compared with the composite photocatalyst 114, it exists in the wastewater in a homogeneous state (homogeneous). Reaction, the present invention will have more advantages in the practical application of organic wastewater recovery and reuse.

A plurality of nano-particles 114b are placed on a porous catalyst carrier 114a. The plurality of nano-particles 114b contain at least one of a plurality of nano-metal particles or a plurality of nano-metal oxide particles in the composite photocatalyst 114 The weight content of the plurality of nanoparticles 114b ranges from about 1000 parts per million (ppm) to 4000 ppm. Nano metal particles are, for example, nano gold particles, nano platinum particles, nano manganese particles, nano iron particles, nano copper particles, nano cobalt particles, nano nickel particles or nano silver particles. Nano metal oxide particles can be iron oxide (for example: Fe ₂ O ₃ ), copper oxide (for example: CuO), cuprous oxide (for example: Cu ₂ O), cobalt oxide (for example: CoO, Co ₂ O ₃ , Co ₃ O ₄ ), nickel oxide (for example: NiO, Ni ₂ O ₃ ), manganese oxide (for example: MnO, Mn ₃ O ₄ , Mn ₂ O ₃ , MnO ₂ ), may also include the following chemical formula (1) Represented compounds: A ²⁺ (B ³⁺ ) ₂ X ₄ chemical formula (1) where A ²⁺ represents Zn ²⁺ , Sn ²⁺ , Cu ²⁺ , Fe ²⁺ , Mn ²⁺ , Ni ²⁺ , Co ²⁺ or Ag ₂ ²⁺ , B ³⁺ means Fe ³⁺ , Mn ³⁺ or Cr ³⁺ , X means O ^2- .

In one embodiment, preferably, the compound of the aforementioned chemical formula (1) is a compound having a spinel crystal structure. The so-called spinel crystal structure includes a normal spinel structure or a reverse spinel structure. Stone structure (inverse spinel structure).

In one embodiment, it is preferable that when A and/or B are magnetic elements, the nano metal oxide particles are magnetic, so that the composite photocatalyst 114 can be reused by being attracted and collected by a magnet. The aforementioned magnet is, for example, a permanent magnet or an electromagnet.

In one embodiment, A ²⁺ represents Zn ²⁺ and B ³⁺ represents Fe ³⁺ .

In another embodiment, A ²⁺ represents Ag ₂ ²⁺ and B ³⁺ represents Fe ³⁺ .

Doping at least one of the aforementioned nano metal particles or the aforementioned nano metal oxide particles in the catalyst carrier 114a for about 1 to 6 hours, and then doping the aforementioned doped nano metal particles or nano metal oxide particles The catalyst carrier 114a is calcined at about 60 to 300 degrees Celsius for about 1 to 24 hours, and the composite photocatalyst 114 can be obtained. The aforementioned catalyst carrier 114a is, for example, porous activated carbon, but the present invention is not limited thereto.

1, the waste water supply unit 120 supplies waste water containing organic substances into the reaction tank 111, and the oxidant supply unit 130 supplies oxidant into the reaction tank 111, and the amount of the oxidant supplied and the amount of waste water treatment have a weight The percentage X and the weight percentage X satisfy the relationship: 0% <X <10%. In some embodiments, the weight percentage X satisfies the relationship: 0.5% <X <3%, but the invention is not limited to this. The oxidant is, for example, peroxide, superoxide, or a combination thereof. For example, the oxidant may be hydrogen peroxide (H ₂ O ₂ ), but it is not limited thereto. Furthermore, in order to accelerate the speed at which the oxidant supply part 130 enters the oxidant into the reaction tank 111, the pump P can be selectively added between the reaction tank 111 and the oxidant supply part 130, as shown in FIG. 1, for example.

In some embodiments, the reaction part 110 may optionally further include a light emitting device 112 to provide a wavelength range that the composite photocatalyst 114 can absorb, but is not limited thereto. In other embodiments, the reaction unit 110 may not include the light-emitting device 112. The light emitting device 112 is a light emitting device that can emit a wavelength range of visible light (about 380 nanometers (nanometer; nm) to about 780 nanometers). For example, the light emitting device 112 may be a visible light tube, an organic or inorganic light emitting element, a perovskite light emitting element, or other suitable light emitting elements, but the invention is not limited thereto. In some embodiments, a transparent window (not shown) may be provided above the reaction part 110, so that sunlight or other visible light sources can illuminate the composite photocatalyst 114 through the transparent window, and other visible light sources can refer to the aforementioned light emission The type described in the device 112 is selected.

The composite photocatalyst 114 can absorb light in the wavelength range of visible light. After the composite photocatalyst 114 absorbs light in the visible range of wavelengths, it can generate electron hole pairs, and then catalyze the oxidant to produce hydroxyl radicals or superoxide ions with high oxidizing power to decompose or crack the organic substances contained in the wastewater. The organic matter can be finally oxidized into carbon dioxide (CO ₂ ) and water (H ₂ O), where the water can be transferred to the appropriate machine, suitable site, suitable discharge place, or other suitable site through the outlet Wout, Carbon dioxide (CO ₂ ) can be collected as one of the gases for chemical or physical reactions, or other suitable uses. Therefore, the composite photocatalyst 114 of the present invention can absorb wavelengths in the visible light range to produce good catalytic efficiency of the catalyst, and rapidly decompose organic pollutants containing carbon, hydrogen and oxygen. The utility model has the advantages of high stability, simple operation and low cost, and can be recycled and used repeatedly, without secondary pollution, and effectively removes organic substances in organic wastewater.

In some embodiments, the degree to which hydroxyl radicals decompose or crack organic substances can be adjusted according to design requirements. For example, in low-concentration organic wastewater with chromophores, the reaction only needs to be decomposed or cracked The chromophore can be discharged after achieving the effect of decolorization, and does not need to mineralize organic substances into carbon dioxide and water. Therefore, the time of photocatalysis can be reduced and the cost can be further reduced, but the invention is not limited to this.

The organic waste water treatment device 100 further includes a circulation part 140 having a circulation line 140a that enters the reaction tank 111 after the decomposition or cracking of the waste water, so as to decompose or crack the residual organic substances in the waste water. In the present invention, by setting the circulation line 140a, waste water that does not meet the discharge standard can be subjected to a photocatalytic reaction again, and further decomposition of organic substances in the waste water is continued. In addition, in order to accelerate the speed of the waste water after decomposition or cracking to enter the reaction tank 111 or transfer it to a higher position in the reaction tank 111, the pump P can be selectively added to the circulation part 140 (for example: the circulation line 140a), For example, as shown in Figure 1.

Please refer to Table 1. In the present invention, it is found that the pH value of the raw water is about 2, the total organic carbon (TOC) value of the raw water is about 138,400 ppm, and the residence time is at least about 30 minutes, for example: about 1 hour If only adding about 3% hydrogen peroxide, the TOC value of the raw water can be slightly reduced to about 123,600 ppm. However, if the composite photocatalyst 114 of the present invention is used together with about 3% hydrogen peroxide, it can be The TOC value of the raw water is greatly reduced to about 18,200 ppm, and the decrease is about 87%. That is to say, the oxidant combined with the composite photocatalyst 114 of the present invention can greatly improve its ability to generate hydroxyl radicals, accelerate its decomposition or cracking organic Material reaction efficiency.

Table 1

FIG. 3 is a processing step diagram of a processing method using an organic wastewater treatment device 100 according to an embodiment of the present invention.

Please refer to FIG. 3. In one embodiment, one of step S210 and step S220 may inject the fluid described in the step into the reaction tank 111. For example, step S210 and step S220 may be performed first, that is, the wastewater is first injected into the reaction tank 111 from the wastewater supply unit 120, and then the oxidant is injected into the reaction tank 111 from the oxidant supply unit 130, but the present invention does not use this as limit. In yet another embodiment, step S210 and step S220 may also be performed simultaneously, that is, the wastewater is injected into the reaction tank 111 from the wastewater supply unit 120 and the oxidant is injected into the reaction tank 111 from the oxidant supply unit 130, but the present invention does not This is limited.

In some embodiments, the waste water supply part 120 may be a liquid storage tank 121 with a water inlet Win above the liquid storage tank 121, and the waste water to be treated may be first sent to the liquid storage tank 121 for storage, and then injected into the reaction tank 111 to improve the process Design flexibility, but the invention is not limited to this. Among them, the source of wastewater can be described in the preceding paragraph.

In some embodiments, waste water and oxidant may be injected into the reaction tank 111 via pump P, but the invention is not limited thereto.

Next, after the waste water and the oxidant are injected into the reaction tank 111, step S230 is performed. In step S230, after the composite photocatalyst 114 absorbs wavelengths in the visible light range in the reaction tank 111, electron hole pairs can be generated, thereby catalyzing the oxidant to generate hydroxyl radicals or superoxide ions with high oxidation capacity to decompose or crack the waste water organic material.

In some embodiments, the residence time of the wastewater in the reaction tank 111 with the composite photocatalyst 114 in the illuminated state is at least about 30 minutes, for example: at least about 1 hour, but the invention is not limited thereto.

In some embodiments, if the reaction tank 111 is a continuous reaction tank with a circulation part 140, the residence time of the waste water in the reaction tank 111 is a hydraulic retention time (HRT), and the hydraulic retention time is one of the reaction tank 111 The effective volume is divided by the flow rate of the reaction tank 111. In other words, the hydraulic retention time is the time during which the wastewater can stay in the reaction tank 111 in the macroscopic state. For example, if the effective volume of the reaction tank 111 is about 700 liters (liter; 1) and the flow rate is about 700 liters/hour, the hydraulic retention time is about 1 hour.

In addition, since the photocatalytic reaction occurs on the surface of the composite photocatalyst 114 in the pores of the porous catalyst carrier 114a, the reaction efficiency of the photocatalytic reaction is positively related to the amount of waste water that can enter the pores of the catalyst carrier 114a. That is, if the reaction tank 111 is a continuous reaction tank having a circulation part 140, the waste water may be a fluid that is always flowing. Compared with the composite photocatalyst 114 standing still in the wastewater to carry out the photocatalytic reaction, the wastewater can flow into the pores of the catalyst carrier 114a without interruption in a flowing state, increasing the amount of wastewater entering the pores of the catalyst carrier 114a, and even can Turbulent flow is generated in the pores of the media carrier 114a to increase the mass transfer reaction rate, thereby more effectively decomposing or cracking organic substances in the wastewater.

Please continue to refer to FIG. 3, after the waste water stays in the reaction tank 111 for at least 1 hour to perform the photocatalytic decomposition reaction, step S240 or step S250 may be performed. In some embodiments, the waste water after decomposition or cracking can be directly discharged from a water outlet (not shown) under the reaction part 110.

In some other embodiments, the organic wastewater treatment device 100 further includes a circulation part 140 having a circulation line 140a to enter the reaction tank 111 after the decomposed or cracked wastewater, so as to allow the residual organic substances in the wastewater to be decomposed or cracked. Therefore, Step S250 may be performed, and the decomposed or cracked wastewater is re-entered into the circulation line 140a of the reaction tank 111, so that the organic substances remaining in the wastewater continue to be decomposed or cracked.

Decolorization

Experimental Example 1

The sewage water sample used in Experimental Example 1 of the present invention is rhodamine B (rhodamine B; RhB) standard dye. The concentration of rhodamine B is about 30 ppm, and the chromaticity before treatment is greater than 3600. Use The oxidant is about 0.3% H ₂ O _{2. The} size of the reaction part 110 is for example: length about 33 cm (centimeter; cm), width about 34 cm, height about 77 cm, the reaction tank 111 is a fixed bed reactor, The reaction tank 111 has a volume of about 1500 ml, a circulating water volume of about 700 ml/hour, and a residence time of about 1 hour. The catalyst carrier 114a in the composite photocatalyst 114 used is activated carbon, and the porosity is about 50%. Nano metal The oxide particles are, for example, iron oxide, but are not limited thereto.

The experimental results show that the experimental example 1 of the present invention can reduce the chroma of rhodamine B from greater than 3600 before treatment to about 24, and the decolorization rate is greater than 99%, which represents the practical application of experimental example 1 of the present invention in industry It also has a good color removal effect.

In summary, the organic wastewater treatment device of the present invention has a catalyst carrier, which can make the composite photocatalyst easier to separate from water. Therefore, compared with the reaction of the composite photocatalyst in the wastewater in a homogeneous state (homogeneous), The invention has more advantages in the practical application of organic waste water recycling and reuse. In addition, the composite photocatalyst of the present invention can absorb wavelengths in the visible light range to produce good catalyst catalytic efficiency, and rapidly decompose organic pollutants containing carbon, hydrogen and oxygen. The utility model has the advantages of high stability, simple operation and low cost, and can be recycled and used repeatedly, without secondary pollution, and effectively removes organic substances in organic wastewater.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

100‧‧‧Organic wastewater treatment device 110‧‧‧Reaction part 111‧‧‧Reaction tank 112‧‧‧Lighting device 114‧‧‧Composite photocatalyst 114a‧‧‧Porous catalyst carrier 114b‧ Nanoparticle 120 ‧‧‧ Waste water supply unit 121‧‧‧Liquid storage tank 130‧‧‧Oxidant supply unit 140‧‧‧‧Circulation unit 140a‧‧‧Circulation line P‧‧‧Pump Win‧‧‧Inlet Wout‧‧‧Outlet

FIG. 1 is a schematic diagram of an organic wastewater treatment device according to an embodiment of the invention. 2 is a schematic diagram of a composite photocatalyst according to an embodiment of the invention. FIG. 3 is a process diagram of a method for treating an organic wastewater treatment device using an embodiment of the present invention.

100‧‧‧ Organic wastewater treatment device

110‧‧‧Response Department

111‧‧‧Reaction tank

112‧‧‧Lighting device

114‧‧‧Composite photocatalyst

120‧‧‧ Wastewater Supply Department

121‧‧‧Liquid storage tank

130‧‧‧Oxidant Supply Department

140‧‧‧Circulation Department

140a‧‧‧Circulation pipeline

P‧‧‧Pump

Win‧‧‧water inlet

Wout‧‧‧ Outlet

Claims (12)

An organic wastewater treatment device includes: a reaction section having at least one reaction tank for treating wastewater containing organic substances, wherein the reaction tank has at least one composite photocatalyst, which absorbs wavelengths in the visible light range, and photocatalytically decomposes or cracks the wastewater The organic substance contained, and the composite photocatalyst includes: at least one porous catalyst carrier with a porosity greater than or equal to 50% and less than 100%; and a plurality of nanoparticles mounted on the catalyst carrier Above, the nano-particles include at least one of a plurality of nano-metal particles or a plurality of nano-metal oxide particles, and the weight content of the nano-particles in the composite photocatalyst ranges from 1000 ppm to 4000 ppm; A waste water supply part, which supplies the waste water to the reaction tank; and an oxidant supply part, which supplies at least one oxidant to the reaction tank, and the supply amount of the oxidant and the treatment amount of the waste water have a weight percentage X, and The weight percentage X satisfies the relationship: 0% <X <10%. The organic wastewater treatment device as described in item 1 of the patent application scope, wherein the organic substance includes at least one of the following organic acids, alcohols, dyes or pigments. An organic wastewater treatment device as described in item 1 of the patent application scope, wherein the oxidant includes at least one of the following peroxides or superoxides. The organic wastewater treatment device as described in item 1 of the patent application scope, wherein the nano metal particles include at least one of nano gold particles, nano platinum particles, nano manganese particles, nano iron particles, nano particles Copper particles, nano cobalt particles, nano nickel particles or nano silver particles. The organic wastewater treatment device as described in item 1 of the patent application scope, wherein the nano metal oxide particles are represented by the following chemical formula (1): A ²⁺ (B ³⁺ ) ₂ X ₄ chemical formula (1) where, A ²⁺ means Zn ²⁺ , Sn ²⁺ , Cu ²⁺ , Fe ²⁺ , Mn ²⁺ , Ni ²⁺ , Co ²⁺ or Ag ₂ ²⁺ , B ³⁺ means Fe ³⁺ , Mn ³⁺ or Cr ^{3 +} , X represents O ^2- . The organic wastewater treatment device as described in item 1 of the patent application scope, wherein the nano metal oxide particles include at least one of the following: Fe ₂ O ₃ , CuO, Cu ₂ O, CoO, Co ₂ O ₃ , Co ₃ O ₄ , NiO, Ni ₂ O ₃ , MnO, Mn ₃ O ₄ , Mn ₂ O ₃ or MnO ₂ . The organic wastewater treatment device as described in item 1 of the patent application scope, wherein the weight percentage X satisfies the relationship: 0.5% ≦ X ≦ 3%. The organic wastewater treatment device as described in item 1 of the patent application range, wherein the bulk density of the composite photocatalyst and the wastewater in the reaction section is 0.5 g/ml to 0.6 g/ml. The organic wastewater treatment device as described in item 1 of the patent application scope, wherein the reaction part further includes a light-emitting device to provide a wavelength range that the composite photocatalyst can absorb. The organic waste water treatment device as described in item 1 of the patent application scope further includes a circulation part having a circulation line for recombining the waste water after decomposition or cracking into the reaction tank to allow the organic substances remaining in the waste water Decompose or crack. An organic waste water treatment method, comprising: providing an organic waste water treatment device according to any one of claims 1 to 9; injecting the waste water from the waste water supply part into the reaction tank; injecting the oxidant from the oxidant supply part into the reaction Tank; wherein: the residence time of the waste water in the reaction tank is at least 30 minutes. The treatment method as described in item 11 of the patent application scope, wherein the organic waste water treatment device further includes a circulation part, which has a circulation line that enters the waste water after decomposition or cracking into the reaction tank to allow residue in the waste water The organic matter is decomposed or cracked, and the treatment method further includes: entering the waste water from the recirculation section into the reaction tank after the decomposition or cracking to allow the organic matter remaining in the wastewater to be decomposed or cracked.

Images