CN113511727A - System for coupling photocatalysis treatment of organic pesticide waste water in constructed wetland - Google Patents

System for coupling photocatalysis treatment of organic pesticide waste water in constructed wetland Download PDF

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CN113511727A
CN113511727A CN202110583993.XA CN202110583993A CN113511727A CN 113511727 A CN113511727 A CN 113511727A CN 202110583993 A CN202110583993 A CN 202110583993A CN 113511727 A CN113511727 A CN 113511727A
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photocatalytic
overflow
photocatalysis
coupling
organic pesticide
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余关龙
汪国梁
谭志斌
朱炎聪
胡锦淋
邓捷
刘湘
陈力然
肖晓珍
王世涛
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Changsha University of Science and Technology
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Changsha University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/306—Pesticides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/34—Organic compounds containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/36—Organic compounds containing halogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/38—Organic compounds containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/343—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the pharmaceutical industry, e.g. containing antibiotics
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/10—Photocatalysts

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Microbiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Biotechnology (AREA)
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  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
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Abstract

The invention discloses a system for coupling and photocatalytic treatment of organic pesticide wastewater by using an artificial wetland, which comprises a photocatalytic device, the artificial wetland and a solar device, wherein the solar device comprises a solar panel, a lead and at least two photocatalytic light sources, the photocatalytic device comprises a photocatalytic tank and at least two overflow plates, each overflow plate is obliquely arranged on the side wall of the photocatalytic tank, a guide plate is arranged between every two adjacent overflow plates, a photocatalyst is attached to each overflow plate, the photocatalytic light sources are respectively arranged at positions opposite to the photocatalysts on the overflow plates, a water outlet is communicated with the artificial wetland, the artificial wetland comprises an artificial wetland pool, a bearing layer and a modified substrate layer, a microorganism layer is arranged in the modified substrate layer, wetland plants are planted on the microorganism layer, and the solar panel is arranged outside the artificial wetland pool. The system has the advantages of simple and compact structure, high organic pesticide removal efficiency, low operation cost, no secondary pollution, convenience in operation and maintenance and the like.

Description

System for coupling photocatalysis treatment of organic pesticide waste water in constructed wetland
Technical Field
The invention relates to the field of sewage treatment, in particular to a system for treating organic pesticide wastewater by coupling photocatalysis in an artificial wetland.
Background
With the development of agricultural science and technology and modernization, the using amount of pesticides is high, and the utilization rate of the pesticides is only about 10% after application, so that a large amount of pesticides enter farmland water to form serious non-point source pollution. Pesticide residues in agricultural non-point source sewage enter water bodies such as rivers, lakes, oceans and the like, so that the pesticide is accumulated in aquatic organisms, and the influence on the ecological environment, the human health and the biodiversity is increasingly remarkable. Therefore, the pesticide pollution problem is also concerned in recent years, and the high-efficiency, low-consumption, safe and environment-friendly pesticide-containing wastewater treatment method has important significance for virtuous cycle of water resources. Especially, the method has important practical significance for removing pesticides in surface water and protecting ecological environment under the background that the country vigorously promotes ecological civilization construction and solves ecological problems.
The traditional techniques for treating the organic pesticide sewage mainly comprise a physical method (comprising an extraction method, an adsorption method, a membrane separation method and the like), a chemical method (comprising a wet oxidation method, an incineration method and the like) and a biological method (comprising an activated sludge method, an anaerobic biological treatment method and the like). Each of the conventional processing techniques has its own advantages, but inevitably has many disadvantages which are difficult to overcome. The physical methods of the extraction method and the adsorption method are simple and easy to implement, but only involve phase separation layers, and some toxic substances still exist after extraction and adsorption, so that the separation cannot be realized, and pollutants cannot be removed fundamentally. Although the membrane separation method has sensitive screening and low energy consumption, the method has the advantages of high manufacturing difficulty, narrow application range and complex and tedious operation. The wet oxidation method has thorough oxidation and short period, but the application of the wet oxidation method is limited by secondary pollution caused by the inactivation and dissolution of the catalyst. The incineration method is a reasonable and low-cost process, but has the problem of secondary pollution caused by overhigh combustion temperature, and only can treat organic pesticide sewage with the calorific value higher than 105kJ/kg, so that the treatment object is obviously limited. The activated sludge method has the defects of low microorganism concentration and short utilization period, and the anaerobic biological treatment technology also has a short board which can not treat organic matters thoroughly.
Compared with the traditional treatment method, the photocatalysis method for treating the organic matters has the advantages of capability of degrading organic macromolecules, mild reaction conditions, good purification effect, stable operation, low operation cost, easy operation and management, no secondary pollution and the like, can better show the superiority when treating organic pesticide wastewater with low concentration, large flow and strong biodegradability, and has wide application prospect.
The photocatalytic reaction has been successfully applied to the treatment of low-concentration polluted non-point source sewage, but the following main problems exist in the specific operation: 1) the photocatalytic degradation is not thorough, and an intermediate product can be generated in the degradation process; 2) the photocatalyst is not easy to recycle, so that the catalyst is difficult to reuse; 3) the photocatalyst has a narrow photoresponse range, most of the photocatalyst has higher catalytic activity under the ultraviolet condition, and solar energy cannot be fully utilized; 4) with respect to the visible light catalyst, the photocatalytic reaction cannot be performed at night.
The material of the photocatalyst is mainly titanium dioxide (TiO)2) And different ion doped TiO2Modified derivatives formed, e.g. N-TiO2、Mg-TiO2And the like. TiO formed by doping with ions of various kinds is also sometimes used2Modified derivative, TiO2And also has both solid and suspended forms. In addition to this, SiO is used2、Fe3O4、C3N4The properties of a photocatalyst, which is a material, vary in various ways.
Although the traditional photocatalytic reaction can reach higher carbonization rate when treating organic pesticides, the photocatalytic reaction is not degraded completely, an intermediate product can be generated, the toxicity of the pesticides cannot be completely eliminated, and even part of the product has stronger toxicity than before degradation, so that the application of the photocatalytic reaction is limited to a certain extent. The artificial wetland has been shown to have excellent performance in the removal of various pollutants as a complex ecosystem for removing the pollutants in wastewater by utilizing the synergistic effect among the substrate, the plants and the microorganisms. Therefore, by using the artificial wetland coupling photocatalysis technology, the organic pollutants can be further degraded by the artificial wetland after being subjected to photocatalysis, and finally, complete degradation is realized.
Disclosure of Invention
The system for treating the organic pesticide wastewater by coupling the artificial wetland with the photocatalysis overcomes the defects in the prior art, and has the advantages of simple and compact structure, high organic pesticide removal efficiency, low operation cost, long operation period, no secondary pollution and convenient operation and maintenance.
In order to solve the technical problems, the invention adopts the following technical scheme.
A system for treating organic pesticide wastewater by coupling photocatalysis of an artificial wetland comprises a photocatalysis device, the artificial wetland and a solar device, wherein the solar device comprises a solar panel, a lead and at least two photocatalysis light sources, the photocatalysis device comprises a photocatalysis tank and at least two overflow plates, each overflow plate is obliquely arranged on the side wall of the photocatalysis tank, a guide plate is arranged between every two adjacent overflow plates, the guide plate is obliquely arranged on the side wall of the photocatalysis tank, an overflow channel is formed between every two adjacent overflow plates and the guide plate, a photocatalyst is attached to each overflow plate, the photocatalysis light sources are respectively arranged at the positions opposite to the photocatalysts on the overflow plates, a water outlet is arranged on the photocatalysis tank and is communicated with the artificial wetland, the artificial wetland comprises the artificial wetland tank, and a supporting layer and a modified substrate layer which are arranged in the artificial wetland tank from bottom to top, the modified substrate layer is internally provided with a microbial layer, wetland plants are planted on the modified substrate layer, the outer side of the artificial wetland pool is provided with a solar panel, and the solar panel is connected with each photocatalytic light source through the leads.
In the system for treating the organic pesticide wastewater by coupling the artificial wetland and the photocatalysis, preferably, the inclined included angle of the overflow plate relative to the bottom wall of the photocatalysis tank is 15-45 ℃, the overflow plates are parallel to each other, and the guide plates are parallel to the adjacent overflow plates.
The system for coupling the constructed wetland and carrying out photocatalytic treatment on the organic pesticide wastewater is preferred, the number of the overflow plates is two, the overflow plates are a first-level overflow plate and a second-level overflow plate in sequence along the water flow direction, the photocatalytic light source is arranged on the side wall of the photocatalytic tank opposite to the photocatalyst on the first-level overflow plate, and the photocatalytic light source is arranged on the surface of the flow guide plate opposite to the photocatalyst on the second-level overflow plate.
The system for treating the organic pesticide wastewater by coupling the artificial wetland and the photocatalysis is preferably characterized in that the photocatalysis tank and the artificial wetland tank share a common side wall, the water outlet is formed in the common side wall, the top of the common side wall is provided with a triangular weir, and the water outlet is formed in the triangular weir.
The system for coupling the artificial wetland and carrying out photocatalytic treatment on the organic pesticide wastewater preferably comprises a photocatalytic tank, wherein a sludge hopper is arranged at the bottom of the photocatalytic tank, and an outlet of the sludge hopper is communicated with a sludge discharge pipe.
The system for coupling the artificial wetland and carrying out photocatalytic treatment on the organic pesticide wastewater preferably comprises a photocatalytic tank, a water inlet is formed in the side wall, away from the water outlet, of the photocatalytic tank, a water collecting pipe is arranged at the bottom of the artificial wetland tank and communicated with a water drainage pipe, and a water level control device is arranged on the water drainage pipe.
In the system for coupling and photocatalytic treatment of organic pesticide wastewater by using the artificial wetland, preferably, the modified substrate layer is composed of a modified substrate, the porosity of the modified substrate layer is 30-35%, the pore diameter is 1-3 cm, and the microorganism layer is composed of immobilized microorganism pellets.
Preferably, the immobilized microorganism pellets comprise resistant microorganisms, wrapping materials and essential substances for microorganism growth, and the resistant microorganisms are obtained by acclimatizing, expanding culture and purifying wastewater containing intermediate products generated after photocatalytic degradation of pesticides by activated sludge in a secondary sedimentation tank of a municipal sewage plant.
In the system for coupling and photocatalytic treatment of organic pesticide wastewater in the artificial wetland, preferably, the photocatalyst is a visible light catalyst, the photocatalytic light source is a visible light source, and the solar device is used at night or in rainy days.
Preferably, the organic pesticide comprises fluazuron and/or 2, 4-dichlorophenoxyacetic acid.
In the system for coupling and photocatalytic treatment of organic pesticide wastewater in the artificial wetland, preferably, the solar panels are obliquely arranged on two sides of the artificial wetland pool through the supporting pieces.
In the invention, the coupling technology solves the limitation of the traditional technology in treating substances with strong toxicity and difficult degradation on the one hand, and macromolecular substances with strong toxicity and difficult degradation are converted into micro-toxic or non-toxic easily-degradable micromolecular substances through the degradation of the photocatalysis technology; on the other hand, the problem of incomplete decomposition of the photocatalytic technology is solved, the photocatalytic technology cannot completely mineralize the substrate, an intermediate product can be generated in the decomposition process, the organic matter cannot be completely removed, but the intermediate product can achieve the effect of complete degradation under the combined action of plants, matrix and microorganisms after entering the artificial wetland. The artificial wetland is used as an artificial ecosystem, the ecological stability is poor, external toxic substances can impact the artificial wetland, the photocatalysis technology is coupled with the artificial wetland, the impact of part of toxic substances on the artificial wetland is eliminated, and the stability of the artificial wetland can be effectively improved, so that the application range of the artificial wetland is widened, and the artificial wetland can be applied to more fields.
Compared with the prior art, the invention has the advantages that:
1. the invention provides a system for coupling photocatalysis treatment of organic pesticide wastewater by constructed wetland, which can overcome the defect of incomplete decomposition of pesticide molecules by photocatalysis technology and realize complete degradation of pesticide wastewater by strengthening measures in the constructed wetland. The application of the device not only can widen the practical application range of the artificial wetland, but also is beneficial to water ecological restoration and water environment protection. The multistage overflow plates and the guide plates in the photocatalytic device jointly form a sloping plate sedimentation tank, sediment in inlet water can be precipitated in advance during photocatalytic reaction, and the blocking condition of a subsequent constructed wetland substrate layer can be greatly improved. And the multistage overflow plates are arranged in parallel at intervals, and the adjacent two stages of overflow plates are separated by the guide plate, so that the flow state of the wastewater can be optimized into a laminar flow state, and the wastewater can be in full contact with the photocatalyst for multiple times in sequence to achieve the purpose of fully degrading pollutants. Under the action of the unidirectional water flow scouring of laminar flow fluid, the photocatalyst on the multi-stage overflow plate is difficult to be covered by sediment to influence the catalytic activity. When in use, the multi-stage overflow plates formed by obliquely and parallelly arranging the plurality of overflow plates can replace a single overflow plate (with the photocatalyst) in time according to the aging, loss or failure condition of the photocatalyst so as to ensure the continuous and efficient operation of the process. The system can meet the requirements of different treatment capacities according to the increase and decrease of the number of the overflow plates.
2. The invention adopts the solar device to supply energy to the visible light photocatalyst at night, not only fully utilizes clean energy, but also realizes multi-stage continuous photocatalytic reaction, improves the continuity and stability of the coupling process for treating pesticide wastewater, and is beneficial to ensuring the treatment efficiency and the treatment scale.
3. The substrate layer of the artificial wetland of the invention introduces the pesticide-resistant immobilized microorganism pellets, so that the photocatalytic products which have influence on the treatment efficiency of the artificial wetland are removed in a targeted and reinforced manner, the efficient treatment of the pesticide can be realized, and the secondary pollution can be avoided.
4. The system has the advantages of high treatment efficiency, simple application, long operation period and simple maintenance, is very suitable for treating the pesticide wastewater with large flow and low concentration, and can effectively control the overgrowth of microorganisms on the substrate layer of the artificial wetland by the low-concentration organic pesticide to avoid blockage.
5. The single body treatment area of the system is large, the system is suitable for treating the organic pesticide wastewater in the farmland, the farmland is used as the main part of rural land, and in addition, the farmland is generally and intensively distributed, and the pesticide non-point source pollution in one area can be treated by the system.
Drawings
Fig. 1 is a front sectional view of a system for coupling photocatalytic treatment of organic pesticide wastewater in an artificial wetland in embodiment 1 of the invention.
Fig. 2 is a top view of a system for coupling and photocatalytic treatment of organic pesticide wastewater in an artificial wetland in example 1 of the invention (wetland plants and a modified substrate layer are not shown).
Fig. 3 is a left side view of the system for coupling and photocatalytic treatment of organic pesticide wastewater by constructed wetland in example 1 of the invention (wetland plants and modified substrate layer are not shown).
Fig. 4 is a schematic structural diagram of a common wall in the system for coupling photocatalytic treatment of organic pesticide wastewater in the artificial wetland in embodiment 1 of the invention.
Illustration of the drawings:
1. a photocatalytic device; 11. a photocatalytic cell; 12. an overflow plate; 121. a primary overflow plate; 122. a secondary overflow plate; 13. a baffle; 14. a water outlet; 15. a water inlet; 16. a sludge hopper; 17. a sludge discharge pipe; 2. artificial wetland; 21. an artificial wetland pool; 22. a modified substrate layer; 23. a microbial layer; 24. wetland plants; 25. a drain pipe; 26. a water collection pipe; 27. a water level control device; 28. a support layer; 3. a solar panel; 4. a wire; 5. a photocatalytic light source; 6. a common side wall; 7. and a triangular weir.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention. The materials and equipment used in the following examples are commercially available.
Example 1:
the invention relates to a system for coupling and photocatalytic treatment of organic pesticide wastewater by artificial wetland, which comprises a photocatalytic device 1, an artificial wetland 2 and a solar device, wherein the solar device comprises a solar panel 3, a lead 4 and a plurality of photocatalytic light sources 5, the photocatalytic device 1 comprises a photocatalytic tank 11 and at least two overflow plates 12, each overflow plate 12 is obliquely arranged on the side wall of the photocatalytic tank 11, a guide plate 13 is arranged between adjacent overflow plates 12, the guide plate 13 is obliquely arranged on the side wall of the photocatalytic tank 11, so that an overflow channel is formed between the adjacent overflow plates 12 and the guide plate 13, a photocatalyst is attached to each overflow plate 12, the plurality of photocatalytic light sources 5 are respectively arranged at positions opposite to the photocatalysts on the overflow plates 12, a water outlet 14 is arranged on the photocatalytic tank 11, the water outlet 14 is communicated with the artificial wetland 2, the artificial wetland 2 comprises an artificial wetland tank 21, and a modified substrate layer 22 and a support layer 28 which are arranged in the artificial wetland tank 21, the modified substrate layer 22 is internally provided with a microorganism layer 23, the microorganism layer 23 is composed of immobilized microorganism pellets, wetland plants 24 are planted on the modified substrate layer 22, the outer side of the artificial wetland pool 21 is provided with a solar panel 3, and the solar panel 3 is connected with each photocatalytic light source 5 through a lead 4.
Each overflow plate 12 is parallel to each other and slope arrangement in photocatalysis pond 11 in this embodiment, the incline direction that the slope was arranged is for following the water flow direction, separate with guide plate 13 between two adjacent overflow plates 12, guide plate 13 and overflow plate 12 parallel arrangement, the topside of overflow plate 12 is less than the open end of photocatalysis pond 11, the side of overflow plate 12 and the lateral wall laminating of photocatalysis pond 11, in order to ensure that rivers pass through from overflow plate 12 top, the topside of guide plate 13 is higher than the topside of overflow plate 12, the side of guide plate 13 and the lateral wall laminating of photocatalysis pond 11, the bottom of guide plate 13 leaves the interval with 11 low walls of photocatalysis pond, make rivers can follow guide plate 13 below and flow through to next grade overflow plate 12. The photocatalytic device 1 mainly realizes the primary decomposition of pesticide wastewater through a photocatalyst, and decomposes pesticide macromolecules into micromolecules.
In this embodiment, the inclined angle of the overflow plate 12 with respect to the bottom wall (horizontal plane) of the photocatalytic cell 11 is 45 ℃, the overflow plates 12 are parallel to each other, and the guide plates 13 are parallel to the adjacent overflow plates 12.
In this embodiment, two overflow plates 12 are provided, which are a primary overflow plate 121 and a secondary overflow plate 122 in sequence along the water flow direction, a photocatalytic light source 5 is provided on the side wall of the photocatalytic tank 11 opposite to the photocatalyst on the primary overflow plate 121, and a photocatalytic light source 5 is provided on the surface of the guide plate 13 opposite to the photocatalyst on the secondary overflow plate 122.
In the practical application process, the number of the overflow plates 12, the guide plates 13 and the photocatalytic light sources 5 can be increased according to the requirement.
In this embodiment, the photocatalytic pool 11 and the artificial wetland pool 21 share a common side wall 6, the water outlet 14 is disposed on the common side wall 6, and the top of the common side wall 6 is provided with a plurality of triangular weirs 7. When pesticide micromolecules degraded in the photocatalytic device 1 enter the artificial wetland 2 from the triangular weir 7 through overflow, the triangular weir 7 can further play a role in changing the flow state of wastewater, so that the artificial wetland 2 can uniformly feed water.
In this embodiment, the bottom of the photocatalytic tank 11 is provided with a sludge hopper 16, the outlet of the sludge hopper 16 is communicated with a sludge discharge pipe 17, and the sludge discharge pipe 17 is used for discharging sludge in the sludge hopper 16 out of the photocatalytic tank 11, so that the sludge discharge effect can be achieved, and the recovery of the lost photocatalyst is also facilitated.
In this embodiment, the bottom end of the side wall of the photocatalytic tank 11 away from the water outlet 14 is provided with a water inlet 15, the bottom of the artificial wetland tank 21 (the bottom of the supporting layer 28) is provided with a water collecting pipe 26, the water collecting pipe 26 is communicated with a water draining pipe 25, and the water draining pipe 25 is provided with a water level control device 27. The sewage treated by the photocatalytic device 1 and the artificial wetland 2 is collected by the water collecting pipe 26 and discharged by the water discharging pipe 25, the water level in the artificial wetland 2 is controlled by the water level control assembly, the water level in the artificial wetland 2 is flexibly adjusted according to the quality of inlet water, so that different hydraulic retention time is achieved, and the treatment efficiency is ensured.
In this embodiment, the modified matrix layer 22 is composed of a modified matrix, the porosity of the modified matrix layer 22 is 30% to 35%, the pore diameter is 1cm to 3cm, the modified matrix is specifically modified artificial zeolite, and the nitrogen source (potassium nitrate) and the phosphorus source (sodium phosphate) are loaded on the zeolite to provide part of the nitrogen source and the phosphorus source required for growth of microorganisms in the matrix.
In this embodiment, the immobilized microorganism pellet includes resistant microorganisms, a wrapping material, and essential substances for microorganism growth, and the resistant microorganisms are obtained by acclimatizing wastewater containing intermediate products, which is generated by subjecting activated sludge in a secondary sedimentation tank of a municipal sewage plant to photocatalytic degradation of pesticides, and then performing propagation and purification. The resistant microorganism can be selected and domesticated according to the actual treated object, for example, the microorganism domesticated by 2, 4-dichlorphenoxyacetic acid is the microorganism resistant to 2, 4-dichlorphenoxyacetic acid, and then is prepared into immobilized microorganism pellets, the wrapping material usually adopts polyvinyl alcohol and sodium alginate, and the essential substance for microorganism growth usually is microelement required by the microorganism. After the resistant microorganisms are introduced into the modified substrate layer 22 of the artificial wetland 2, the microorganisms have specificity on photocatalytic degradation products, can be efficiently decomposed and reach the treatment efficiency of more than 98 percent.
In the embodiment, the diameter of the immobilized microorganism pellet is about 0.3 cm-1.0 cm, the immobilized microorganism pellet is positioned in the modified substrate layer 22 and is intensively distributed at the root part of the plant, and the planar laying density is 3-6/cm2. After the wastewater after photocatalytic degradation enters the artificial wetland, the pesticide wastewater can be thoroughly and efficiently decomposed under the synergistic effect of the modified substrate layer 22, the wetland plant 24 and the microorganism layer 23.
The wetland plant 24 in this embodiment is reed, has developed root system, and can effectively transmit oxygen to the microorganism through the root system, so as to meet the requirement of the microorganism on oxygen when degrading the intermediate product. Of course, other local dominant indigenous aquatic plants such as typha orientalis and pinwheel grass may be used in other embodiments.
In the embodiment, the photocatalyst is a visible light photocatalyst, the photocatalytic light source is a visible light source, and the solar device is used at night or in rainy days, so that the energy is saved, the environment is protected, the day and night continuous operation of a photocatalytic system is realized, and the processing scale and the process stability of the device are guaranteed.
In this embodiment, the organic pesticide in the treated wastewater includes teflubenzuron, 2, 4-dichlorophenoxyacetic acid, and the like.
In this embodiment, as shown in fig. 3, the solar panel 3 is obliquely installed on both sides of the artificial wetland pool 21 through the supporting member, wherein an included angle between the solar panel 3 and the sidewall of the artificial wetland pool 21 is 70 °, and may be set to 55 ° to 80 ° in other embodiments.
The working principle of the system for treating organic pesticide wastewater by coupling artificial wetland and photocatalysis is as follows:
organic pesticide waste water in the farmland enters from a water inlet 15 at the bottom of the photocatalytic device 1, then flows from the bottom end of the first-stage overflow plate 121 to the upper end, overflows from the upper end of the first-stage overflow plate 121, is guided to the bottom of the photocatalytic tank 11 by the guide plate 13, flows to the second-stage overflow plate 122 from the lower part of the guide plate 13, is flushed to the upper end from the bottom end of the second-stage overflow plate 122, and enters the artificial wetland through the triangular weir 7. One-level overflow plate 121, second grade overflow plate 122 and guide plate 13 interval parallel arrangement optimize into the laminar flow state with the waste water flow state, make waste water fully contact with the photocatalyst on one-level overflow plate 121, the second grade overflow plate 122 in proper order, can guarantee organic pesticide in the waste water and photocatalyst fully react, can make the waste water flow state stable again, effectively improve photocatalysis efficiency. The primary overflow plate 121, the secondary overflow plate 122 and the guide plate 13 jointly form a tilted plate sedimentation tank, so that sediments in the inlet water can be precipitated at the same time of photocatalytic reaction, and the blocking condition of a subsequent artificial wetland substrate layer can be greatly improved. And under the action of the unidirectional water flow scouring of the laminar flow fluid, the photocatalyst on the overflow plate 13 is difficult to be covered by the sediment to influence the catalytic activity. The mud discharging area at the bottom can play a role in discharging mud and is convenient for recovering the lost photocatalyst. The pesticide micromolecules after photocatalytic degradation enter the artificial wetland 2 along with the wastewater through the triangular weir 7, and the pesticide wastewater is thoroughly purified through the synergistic effect of the modified substrate layer 22, the wetland plants 24 and the immobilized microorganism pellets.
The photocatalyst with high activity can decompose pesticide macromolecules into micromolecular organic matters under the irradiation of visible light, so that the biodegradability of the wastewater is improved, and the mineralization rate can reach more than 95%. For example, benzoyl urea pesticides such as fluazuron can be degraded into micro-toxic 2-fluorobenzamide by photocatalysis, and the 2-fluorobenzamide can be completely mineralized after being treated by an artificial wetland.
The invention couples the solar device through the coupling of the photocatalysis technology and the artificial wetland, ensures continuous multistage photocatalysis reaction and combines the decomposition of immobilized resistant microorganisms, and finally achieves the aim of efficiently treating the organic pesticide wastewater.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.

Claims (10)

1. The system for treating the organic pesticide wastewater by coupling the artificial wetland and photocatalysis is characterized by comprising a photocatalysis device (1), the artificial wetland (2) and a solar device, wherein the solar device comprises a solar panel (3), a lead (4) and at least two photocatalysis light sources (5), the photocatalysis device (1) comprises a photocatalysis pool (11) and at least two overflow plates (12), each overflow plate (12) is obliquely arranged on the side wall of the photocatalysis pool (11), a guide plate (13) is arranged between every two adjacent overflow plates (12), the guide plate (13) is obliquely arranged on the side wall of the photocatalysis pool (11) to form an overflow channel between every two adjacent overflow plates (12) and the guide plate (13), a photocatalyst is attached to each overflow plate (12), and the photocatalysis light sources (5) are respectively arranged at positions corresponding to the photocatalysts on the overflow plates (12), be equipped with delivery port (14) on photocatalysis pond (11), delivery port (14) with constructed wetland (2) intercommunication, constructed wetland (2) include constructed wetland pond (21) and by supreme supporting layer (28) and the modified matrix layer (22) of setting in constructed wetland pond (21) down, be equipped with microorganism layer (23) in modified matrix layer (22), plant wetland plant (24) on modified matrix layer (22), solar panel (3) have been installed in constructed wetland pond (21) outside, solar panel (3) pass through with each photocatalysis light source (5) wire (4) are connected.
2. The system for coupling and photocatalytic treatment of organic pesticide wastewater by constructed wetlands according to claim 1, wherein the inclined angle of the overflow plates (12) relative to the bottom wall of the photocatalytic tank (11) is 15-45 ℃, the overflow plates (12) are parallel to each other, and the guide plates (13) are parallel to the adjacent overflow plates (12).
3. The system for coupling photocatalytic treatment of organic pesticide wastewater through constructed wetlands according to claim 2, wherein the number of the overflow plates (12) is two, a primary overflow plate (121) and a secondary overflow plate (122) are sequentially arranged along the water flow direction, the photocatalytic light source (5) is arranged on the side wall of the photocatalytic pool (11) opposite to the photocatalyst on the primary overflow plate (121), and the photocatalytic light source (5) is arranged on the surface of the guide plate (13) opposite to the photocatalyst on the secondary overflow plate (122).
4. The system for coupling and photocatalytic treatment of organic pesticide wastewater by using the constructed wetland according to any one of claims 1 to 3, wherein the photocatalytic tank (11) and the constructed wetland tank (21) share a common side wall (6), the water outlet (14) is arranged on the common side wall (6), a triangular weir (7) is arranged at the top of the common side wall (6), and the water outlet (14) is formed on the triangular weir (7).
5. The system for coupling and photocatalytic treatment of organic pesticide wastewater through constructed wetlands according to any one of claims 1 to 3, wherein a sludge hopper (16) is arranged at the bottom of the photocatalytic tank (11), and an outlet of the sludge hopper (16) is communicated with a sludge discharge pipe (17).
6. The system for coupling and photocatalytic treatment of organic pesticide wastewater by the constructed wetland according to any one of claims 1 to 3, characterized in that a water inlet (15) is formed in the side wall of the photocatalytic tank (11) far away from the water outlet (14), a water collecting pipe (26) is formed at the bottom of the constructed wetland tank (21), the water collecting pipe (26) is communicated with a water discharge pipe (25), and a water level control device (27) is arranged on the water discharge pipe (25).
7. The system for coupling and photocatalytic treatment of organic pesticide wastewater through constructed wetlands according to any one of claims 1 to 3, wherein the modified substrate layer (22) is composed of a modified substrate, the porosity of the modified substrate layer (22) is 30-35%, the pore diameter is 1-3 cm, and the microorganism layer (23) is composed of immobilized microorganism pellets.
8. The system for coupling photocatalytic treatment of organic pesticide wastewater through constructed wetlands according to any one of claims 1 to 3, wherein the immobilized microorganism pellets comprise resistant microorganisms, wrapping materials and essential substances for microorganism growth, and the resistant microorganisms are obtained by acclimatization, propagation and purification of wastewater containing intermediate products generated after photocatalytic degradation of pesticides by activated sludge in secondary sedimentation tanks of municipal sewage plants.
9. The system for coupling and photocatalytic treatment of organic pesticide wastewater through constructed wetlands according to any one of claims 1 to 3, wherein the photocatalyst is a visible light catalyst, the photocatalytic light source is a visible light source, and the solar device is used at night or on rainy days.
10. The system for coupling photocatalysis treatment of organic pesticide wastewater through constructed wetlands according to any one of claims 1 to 3, wherein the organic pesticide comprises fluazuron and/or 2, 4-dichlorophenoxyacetic acid.
CN202110583993.XA 2021-05-27 2021-05-27 System for coupling photocatalysis treatment of organic pesticide waste water in constructed wetland Pending CN113511727A (en)

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