A method for treating aquaculture wastewater by combining catalytic oxidation slope with functional pond

Abstract

The invention discloses a method for treating aquaculture wastewater by combining a catalytic oxidation slope with a functional pond, and the steps are: 1) loading a photocatalytic material and an oxidant on a smooth inclined plate to prepare a catalytic oxidation slope; 2) spreading a mineral-based porous material inoculated with functional microorganisms on the bottom mud of the ecological pond, and planting submerged plants; 3) placing the catalytic oxidation slope in the middle of the ecological pond, with the slope forming a certain angle with the water surface; 4) the aquaculture wastewater enters the ecological pond, is pumped to the top of the slope by a pump, and flows down the slope evenly and slowly, and an external light source is used to provide illumination on rainy days; 5) the wastewater is subjected to a catalytic oxidation reaction by the photocatalyst and oxidation material on the slope, and at the same time, the functional microorganisms, submerged plants, and porous mineral-based materials in the ecological pond perform physical and chemical adsorption and biodegradation on the wastewater, and the aquaculture wastewater is effectively treated through multiple synergistic effects to achieve recycling. It is environmentally friendly, easy to use, occupies a small area, and can efficiently treat aquaculture wastewater.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and more specifically relates to a method for treating aquaculture wastewater combining a catalytic oxidation slope with a functional pond, which is suitable for treating aquaculture wastewater of fish, shrimps, crabs, etc. Background Art

[0002] In the context of rapid development of science and technology, many high-tech technologies and equipment have been widely used in aquaculture wastewater treatment, resulting in the continuous improvement of treatment technology. Currently, commonly used treatment technologies include physical treatment technology, chemical treatment technology, physical and chemical combined treatment technology, biological treatment technology, artificial wetland treatment technology, etc. As China's environmental protection standards become increasingly stringent, it is necessary to further develop appropriate treatment technologies, organically combine different treatment processes, and comprehensively utilize physical, chemical, biological and other methods to improve the water environment, effectively control the eutrophication process of water bodies, and reduce the adverse effects of aquaculture on the environment. At the same time, it is necessary to achieve the recycling of aquaculture wastewater. Summary of the invention

[0003] In view of the difficulty in treating aquaculture wastewater with existing technologies, the purpose of the present invention is to provide an aquaculture wastewater treatment method that combines a catalytic oxidation slope with a functional ecological pond. This method has the advantages of being environmentally friendly, easy to use, occupying a small area, and being able to efficiently treat aquaculture wastewater.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions.

[0005] The present invention combines catalytic oxidation technology with a multifunctional ecological pond, and uses photocatalysts and oxidizing materials to catalyze oxidation reactions on wastewater. At the same time, functional microorganisms, submerged plants, and biomass mineral-based materials in the ecological pond perform physical and chemical adsorption and biodegradation on wastewater. Through multiple synergistic effects, aquaculture wastewater is effectively treated to achieve the purpose of recycling. The method is environmentally friendly, easy to use, occupies a small area, and can efficiently treat aquaculture wastewater.

[0006] A method for treating aquaculture wastewater by combining a catalytic oxidation slope with a functional ecological pond, the steps of which are:

[0007] 1) Loading photocatalytic materials and oxidants on a smooth inclined plate to obtain a catalytic oxidation inclined surface;

[0008] 2) Spread mineral-based porous materials (spreading thickness 2-5cm) inoculated with functional microorganisms (inoculation amount 5-10 / 1000) on the bottom mud of the ecological pond and plant submerged plants;

[0009] 3) Place the catalytic oxidation slope in the middle of the ecological pond, with the slope forming an angle of about 150 degrees with the water surface;

[0010] 4) Aquaculture wastewater enters the ecological pond and is pumped to the top of the slope, where it flows down evenly and slowly. On rainy days, an external light source is used to provide illumination. A high-pressure mercury lamp and other light sources are installed above the system. When the system is running, it can irradiate for 2-4 hours a day, supplementing the lack of sunlight on rainy days and allowing the catalytic oxidation slope to continue to exert its catalytic efficiency.

[0011] 5) The wastewater is catalytically oxidized by the photocatalyst and oxidant (material) on the slope, while the functional microorganisms, submerged plants, and mineral-based porous materials (biomass mineral-based materials) in the ecological pond perform physical and chemical adsorption and biodegradation on the wastewater. Through multiple synergistic effects, the aquaculture wastewater is effectively treated to achieve the purpose of recycling. The removal rates of total nitrogen, total phosphorus, and organic matter in aquaculture wastewater reach 90%, 90%, and 80% respectively, and the wastewater can be recycled.

[0012] The photocatalyst (material) is a visible light responsive catalyst bismuth tungstate Bi2MoO6, and the oxidant is barium peroxide (BaO2);

[0013] The bismuth tungstate (Bi2MoO6) is a new type of photocatalytic material, which has the advantages of narrow band gap, high photochemical stability, strong oxidation ability, low cost, easy excitation under visible light irradiation, high utilization rate of solar energy, efficient organic matter degradation ability and high catalytic activity.

[0014] The functional microorganism is a rhizosphere growth-promoting bacterium (deposit number: CCTCC M 2020188, purchased) with multiple functions such as solubilizing phosphorus and promoting the growth of submerged plants;

[0015] The mineral-based porous material is a mineral mixture prepared by mixing sepiolite and mica in a mass ratio of 5-10:1.

[0016] The ratio of the functional microorganisms to the mixed mineral mixture is 5-10 / 1000 in inoculation amount and 2-5 cm in spreading thickness;

[0017] The submerged plants are Vallisneria and Hydrilla, and the planting ratio of Vallisneria and Hydrilla is 5:5.

[0018] The wastewater is catalytically oxidized by the photocatalyst and oxidizing materials on the slope. Meanwhile, the functional microorganisms, submerged plants and porous mineral-based materials in the ecological pond physically and chemically adsorb and biodegrade the wastewater. Through multiple synergistic effects, the aquaculture wastewater is effectively treated to achieve the purpose of recycling.

[0019] Through the above five steps of technical measures:

[0020] The most critical step is to combine the catalytic oxidation slope with the functional ecological pond.

[0021] The wastewater is catalytically oxidized by the photocatalyst and oxidant (material) on the slope. At the same time, the functional microorganisms, submerged plants, and mineral-based porous materials (biomass mineral-based materials) in the ecological pond physically and chemically adsorb and biodegrade the wastewater. Through multiple synergistic effects, the aquaculture wastewater is effectively treated and the purpose of recycling is achieved. The invention solves the technical problems of low efficiency of aquaculture tailwater treatment (most existing technologies such as surface flow artificial wetland + ecological pond combination technology have a removal rate of only 50%, 40% and 40% of total nitrogen, total phosphorus and organic matter in aquaculture wastewater), large land occupation of traditional ecological engineering technology, and difficulty in recycling wastewater (traditional ecological engineering treatment technology to treat aquaculture tailwater, the land area needs to account for 8-12% of the aquaculture water surface, and it is difficult for general aquaculture areas to provide such a large-scale land; at the same time, with the increasingly strict management of aquaculture tailwater discharge and precious water resources, wastewater recycling is a top priority, but the water quality after purification by traditional ecological engineering technology is difficult to meet the recycling requirements). The present invention combines catalytic oxidation technology with multifunctional ecological ponds, catalytic oxidation reaction of wastewater by photocatalysts and oxidizing materials, and physical and chemical adsorption and biodegradation of wastewater by functional microorganisms, submerged plants, and biomass mineral-based materials in the ecological pond. Through numerous experiments, it is found that its multiple synergistic effects can effectively treat aquaculture wastewater and achieve the purpose of recycling. It effectively solves the problems of low efficiency and large land occupation of traditional ecological engineering technology, and can efficiently treat aquaculture wastewater. After applying the technology of the present invention, the removal rates of total nitrogen, total phosphorus and organic matter in aquaculture wastewater reach over 90%, 90% and 80% respectively.

[0022] Compared with the ecological pond treatment technology, the present invention can increase the removal rates of total nitrogen, total phosphorus and organic matter in aquaculture wastewater by 200%, 300% and 150% respectively, and reduce the occupied area by more than half.

[0023] The main differences between the technical solution and the existing technology are: 1) On the basis of traditional ecological pond technology, mineral-based porous materials inoculated with functional microorganisms are spread on the bottom mud of the ecological pond and submerged plants are planted; 2) The catalytic oxidation slope is placed in the middle of the ecological pond, and the catalytic oxidation slope is combined with the functional ecological pond. The wastewater is catalytically oxidized by the photocatalyst and oxidant (material) on the slope, while the functional microorganisms, submerged plants, and mineral-based porous materials (biomass mineral-based materials) in the ecological pond perform physical and chemical adsorption and biodegradation on the wastewater, and the aquaculture wastewater is effectively treated through multiple synergistic effects to achieve the purpose of recycling.

[0024] The removal rates of total nitrogen, total phosphorus and organic matter in aquaculture wastewater reach over 90%, 90% and 80% respectively, and the wastewater can be recycled.

[0025] Compared with the prior art, the present invention has the following advantages and effects:

[0026] 1. The method is easy to implement, simple to operate, occupies a small area, and has significant environmental and social benefits;

[0027] 2. The material is natural clay mineral, which is eco-friendly and environmentally friendly, without secondary pollution. It gives full play to the characteristics of natural materials and can significantly promote the growth of microbial film and submerged plants;

[0028] 3. Through the synergistic effects of photocatalytic oxidation, functional microorganisms, submerged plants, and porous mineral-based materials, aquaculture wastewater is effectively treated to achieve the purpose of recycling;

[0029] 4. After applying this technology, the removal rates of total nitrogen, total phosphorus and organic matter in aquaculture wastewater reached over 90%, 90% and 80% respectively. DETAILED DESCRIPTION

[0030] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0031] Embodiment 1:

[0032] A method for treating aquaculture wastewater by combining a catalytic oxidation slope with a functional ecological pond, the steps of which are:

[0033] 1) Loading photocatalytic materials and oxidants on a smooth inclined plate to obtain a catalytic oxidation inclined surface;

[0034] 2) Spread mineral-based porous materials inoculated with functional microorganisms on the bottom mud of the ecological pond and plant submerged plants;

[0035] 3) Place the catalytic oxidation slope in the middle of the ecological pond, with the slope forming an angle of 150 degrees with the water surface;

[0036] 4) Aquaculture wastewater enters the ecological pond and is pumped to the top of the slope, flowing down the slope evenly and slowly. On rainy days, an external light source is used to provide light; a 500W high-pressure mercury lamp is used to provide light, and the irradiation time is 4 hours per day;

[0037] 5) The wastewater is catalytically oxidized by the photocatalyst and oxidizing materials on the slope. At the same time, the functional microorganisms, submerged plants, and biomass mineral-based materials in the ecological pond physically and chemically adsorb and biodegrade the wastewater. Through multiple synergistic effects, the aquaculture wastewater is effectively treated to achieve the purpose of recycling.

[0038] The photocatalytic material is a visible light responsive catalyst bismuth tungstate Bi2MoO6, and the oxidant is barium peroxide (BaO2);

[0039] The functional microorganism is a rhizosphere growth-promoting bacterium with multiple functions such as solubilizing phosphorus and promoting the growth of submerged plants (deposit number: CCTCC M 2020188);

[0040] The biomass mineral-based material (mineral-based porous material) is a mineral mixture prepared by mixing sepiolite and mica in a mass ratio of 5:1, 6:1 or 7:1.

[0041] The ratio of the functional microorganisms to the mixed mineral mixture is 1 / 100 of the inoculation amount, and the spreading thickness is 2 cm.

[0042] The submerged plants are Vallisneria and Hydrilla, and the planting ratio of Vallisneria and Hydrilla is 5:5.

[0043] The above method was used to treat aquaculture wastewater. After multiple tests (10-20 times), the content of various pollutants in the wastewater was: total nitrogen 16.8 mg / L, ammonia nitrogen 9.5 mg / L, total phosphorus 2.2 mg / L, COD 60 mg / L. The retention time was 4 hours, and the removal rates of total nitrogen, ammonia nitrogen, total phosphorus and COD were 91%, 95%, 92% and 80% respectively.

[0044] Embodiment 2:

[0045] 1. A method for treating aquaculture wastewater by combining a catalytic oxidation slope with a functional ecological pond, the steps of which are:

[0046] 1) Loading photocatalytic materials and oxidants on a smooth inclined plate to obtain a catalytic oxidation inclined surface;

[0047] 2) Spread mineral-based porous materials inoculated with functional microorganisms on the bottom mud of the ecological pond and plant submerged plants;

[0048] 3) Place the catalytic oxidation slope in the middle of the ecological pond, with the slope forming an angle of 150 degrees with the water surface;

[0049] 4) Aquaculture wastewater enters the ecological pond and is pumped to the top of the slope, flowing down the slope evenly and slowly. On rainy days, an external light source is used to provide illumination;

[0050] 5) The wastewater is catalytically oxidized by the photocatalyst and oxidizing materials on the slope. At the same time, the functional microorganisms, submerged plants, and biomass mineral-based materials in the ecological pond physically and chemically adsorb and biodegrade the wastewater. Through multiple synergistic effects, the aquaculture wastewater is effectively treated to achieve the purpose of recycling.

[0051] The photocatalytic material is a visible light responsive catalyst bismuth tungstate Bi2MoO6, and the oxidant is barium peroxide BaO2;

[0052] The functional microorganism is a rhizosphere growth-promoting bacterium with multiple functions such as solubilizing phosphorus and promoting the growth of submerged plants (deposit number: CCTCC M 2020188);

[0053] The mineral-based porous material is a mineral mixture prepared by mixing sepiolite and mica in a mass ratio of 10:1, 9:1 or 8:1.

[0054] The ratio of the functional microorganisms to the mixed mineral mixture is 5 / 1000 in inoculation amount and the spreading thickness is 5 cm;

[0055] The submerged plants are Vallisneria and Hydrilla, and the planting ratio of Vallisneria and Hydrilla is 5:5.

[0056] The above method was used to treat aquaculture wastewater. After multiple tests (10-20 times), the content of various pollutants in the wastewater was: total nitrogen 6.9 mg / L, ammonia nitrogen 3.8 mg / L, total phosphorus 0.9 mg / L, COD 30 mg / L. The retention time was 4 hours, and the removal rates of total nitrogen, ammonia nitrogen, total phosphorus and COD were 90%, 92%, 90% and 86% respectively.

Claims

1. A method for treating aquaculture wastewater by combining a catalytic oxidation slope with a functional pond, characterized in that: The steps are: 1) Loading photocatalytic materials and oxidants on a smooth inclined plate to obtain a catalytic oxidation inclined surface; 2) Spread mineral-based porous materials inoculated with functional microorganisms on the bottom mud of the ecological pond and plant submerged plants; 3) Place the catalytic oxidation slope in the middle of the ecological pond, with the slope forming an angle of 150 degrees with the water surface; 4) Aquaculture wastewater enters the ecological pond and is pumped to the top of the slope, flowing down the slope evenly and slowly. On rainy days, an external light source is used to provide illumination. A 500W high-pressure mercury lamp is installed above the system. When the system is running, it irradiates for 4 hours a day. 5) The wastewater is catalytically oxidized by the photocatalyst and oxidant on the slope, while the functional microorganisms, submerged plants, and mineral-based porous materials in the ecological pond physically and chemically adsorb and biodegrade the wastewater. Through multiple synergistic effects, the aquaculture wastewater is effectively treated and recycled; The ratio of the functional microorganisms to the mixed mineral mixture is 1 / 100 of the inoculation amount, and the spreading thickness is 2 cm.

2. The method for treating aquaculture wastewater by combining a catalytic oxidation slope with a functional pond according to claim 1, characterized in that: The photocatalyst is a visible light responsive catalyst bismuth tungstate, and the oxidant is barium peroxide.

3. The aquaculture wastewater treatment method combining a catalytic oxidation slope and a functional pond according to claim 1 is characterized in that: The mineral-based porous material is a mineral mixture prepared by mixing sepiolite and mica in a mass ratio of 5-10:

1.

4. The method for treating aquaculture wastewater by combining a catalytic oxidation slope with a functional pond according to claim 1, characterized in that: The submerged plants are Vallisneria and Hydrilla, and the planting ratio of Vallisneria and Hydrilla is 5:5.