CN107840532B - Sewage treatment tail water denitrification treatment method - Google Patents
Sewage treatment tail water denitrification treatment method Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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Abstract
The invention discloses a tail water denitrification treatment system of a sewage treatment plant, and belongs to the field of water treatment. According to the invention, the tail water is preliminarily filtered by the filtering area, large suspended solid particles are intercepted, the activated carbon has an adsorption effect and can adsorb nitrogen in the tail water, the strains at the root of soybean are used for culturing algae in the processing area to obtain substances for removing nitrogen, the substances are cultured in a culture medium rich in a carbon source to generate a large amount of algae microorganisms, the algae cells can utilize various inorganic nitrogen and organic nitrogen compounds in a water body as nitrogen sources, carbon dioxide and nitrate are used as carbon sources for photoautotrophic growth, the two plants capable of adsorbing nitrogen are used for grafting in the plant area, the denitrification capability of the two plants can be simultaneously embodied, and the denitrification processing efficiency is improved. The invention solves the problems that the purification effect of the prior plant method is limited, only 20 percent of pollutants can be removed, the transparency of the water body can only reach 0.5 meter, and the denitrification treatment efficiency is low.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a sewage treatment tail water denitrification treatment system.
Background
The tail water refers to industrial, domestic and agricultural drainage which is treated but does not reach the water environment standard. The discharge form of the standard-reaching tail water of the urban sewage plant in China is mainly centralized discharge, and pollutants in the tail water are further degraded by utilizing the self-purification capacity of rivers so as to meet the water environment function target of the receiving water body. However, with the acceleration of the urbanization process, the tail water receiving rivers of most urban sewage plants gradually lose the water environment function. In order to reach higher emission standard, original treatment units of a plurality of water plants cannot meet the existing requirements due to design reasons, and upgrading and modification in the field are difficult to be carried out under the current conditions due to the limitation of the field and the original process, so that more and more tail water advanced treatment projects of sewage treatment plants are developed for planning and construction.
At present, most sewage treatment plants in China still mainly adopt secondary treatment, most pollutants can be reduced by the secondary biological treatment of sewage, and the concentrations of organic matters, nitrogen and phosphorus in tail water are still high. Some sewage treatment plants also often face the risk of effluent quality exceeding standards. Even if the tail water of the sewage plant reaches the first class A standard of the pollutant discharge standard of urban sewage treatment plant (GB 18918-2002) with the highest discharge requirement, the tail water still has a large gap from the lowest class V water (agricultural water and general landscape water) standard of natural water bodies. In general, tail water of a sewage treatment plant is generally clear when leaving a factory and shows a bottom, and after being discharged into a static water body such as a park pond or a small reservoir, the water body is quickly changed into brown or yellow brown, the transparency of the water body is poor, the sensory effect is poor, submerged plants cannot normally grow, the transparency of the natural water body cannot be met, the water quality requirement for growth of aquatic plants is met, and the method is also an important pollution source for a receiving water body, particularly for a receiving water body with limited self-purification capacity. The tail water of the sewage plant is subjected to advanced treatment, so that the influence of the tail water on the receiving water body can be reduced, and the water environment of China is improved.
After the quality of the tail water after advanced treatment reaches a certain standard, the tail water can be reused for industrial and agricultural and municipal water, surface water supplementation, groundwater recharge and the like, so that the water supply is increased, and the influence of human behaviors on the environment is reduced.
The prior art treatment method for tail water of a sewage treatment plant comprises three major methods, namely a chemical method, a plant method and a physical method. The basic principle of the chemical method is to pump part (such as 10%) of water out, and add flocculant to reduce the phosphorus in the water to a lower level, so as to inhibit the growth of algae and achieve the effect of improving the transparency. The main function of the physical method is to prevent the water body from blackening and smelling. The plant method is to utilize planted emergent aquatic plants, floating plants and rhizosphere microorganisms to absorb nitrogen, phosphorus and organic matters in the water body so as to reduce the nutrient level of the water body and inhibit the growth of algae. Although the method has certain effect, the plant method has limited purification effect, can only remove 20% of pollutants, can only remove 0.5 m of water transparency, and has extremely low denitrification efficiency, so the invention provides a treatment method with high denitrification efficiency.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems that the purification effect of the current plant method is limited, only 20% of pollutants can be removed, the transparency of a water body can only reach 0.5 m, and the denitrification treatment efficiency is low, the system for denitrifying the tail water of sewage treatment is provided.
In order to solve the technical problems, the invention adopts the following technical scheme:
a denitrification treatment system for tail water of a sewage treatment plant is characterized by comprising the following steps:
(1) lifting the tail water of the sewage treatment plant to a filtering area for filtering treatment, and arranging a filter plate inside the filtering area:
(2) discharging the filtered tail water of the sewage treatment plant to a treatment area, wherein a bottom material is arranged at the bottom of the treatment area, and adding a treatment agent with the mass of 10-15% of the tail water of the sewage treatment plant into the treatment area for treatment;
(3) conveying the treated tail water of the sewage treatment plant to a plant area, wherein the bottom of the plant area is provided with biological bed charge, and modified plants are planted on the surface of the plant area for adsorption;
(4) discharging the adsorbed tail water of the sewage treatment plant to a catalysis-electrolysis zone, and adding solid catalytic particles with the mass of 5-8% of the tail water of the sewage treatment plant into the catalysis-electrolysis zone for electrolysis;
(5) and conveying the electrolyzed water to a disinfection area for disinfection, and discharging water after disinfection.
The base material in the step (2) is prepared from the following raw materials in a mass ratio of 7-8: 3-4: 1-2, mixing the river sediment, the diatomite and the cobblestones to obtain a mixture, namely the bottom material.
The preparation method of the treating agent in the step (2) comprises the following steps: mixing 40-50 parts of water, 20-30 parts of glutamine, 10-15 parts of glucose and 7-8 parts of sodium chloride in parts by weight, and sterilizing at high temperature to obtain a nutrient solution, wherein the mass ratio of the components is 1: 3-4, performing mixed culture on soybean roots and a nutrient solution, culturing for 2-3 d, filtering to obtain filter residues, placing the filter residues in a culture chamber for culturing until hyphae appear, obtaining hypha filter residues, washing the hypha filter residues with deionized water, collecting washing liquid, injecting the washing liquid into blue-green algae, wherein the injection amount is 50-80 mL, obtaining blue-green algae after injection, mixing 40-50 parts of water, 20-30 parts of peptone, 10-15 parts of glucose, 7-8 parts of sodium chloride and 1-2 parts of sodium carbonate in parts by weight, and performing high-temperature sterilization to obtain a culture solution, wherein the mass ratio of the culture solution is 1: and 3-4, mixing the blue algae after injection with a culture solution, soaking for 4-5 days, and filtering to obtain soaked filter residues, namely the treating agent.
The biological substrate in the step (3) is prepared from the following raw materials in a mass ratio of 7-8: 3-4: 1-2, mixing the pond sludge, the laterite and the gravel to obtain a mixture, and obtaining the biological bed charge.
And (3) obliquely cutting the side surface of the root of the salix lobutra into a position with the root diameter of 1/3 and the length of 2-3 cm, taking branches with 2-3 buds of jasmine, cutting one side of the scion into an inclined plane with 2-3 cm, cutting the opposite side of the scion into a short inclined plane with the length of 1-2 cm, mixing 40-50 parts by weight of water, 20-30 parts by weight of peptone, 10-15 parts by weight of glucose and 7-8 parts by weight of sodium chloride, and sterilizing at high temperature to obtain a nutrient solution a, wherein the mass ratio of the nutrient solution a to the nutrient solution a is 1: 1: 3, putting the oblique cutting plane of the side face of the root of the salix lobular and the short oblique plane of the jasmine branch into the nutrient solution a, soaking for 1-2 hours, taking out, inserting the scion aiming at the cambium of the root, and bundling the scion and the interface of the stock by using a plastic film to obtain the improved plant.
And (4) the solid catalytic particles in the step (4) are manganese dioxide.
Compared with other methods, the method has the beneficial technical effects that: the invention relates to a denitrification treatment system for tail water of sewage treatment, wherein a filtering area primarily filters the tail water of sewage treatment to intercept large suspended solid particles, active carbon has adsorption effect and can adsorb nitrogen in the tail water, a treatment area utilizes strains at the root of soybean to culture algae to obtain substances for removing nitrogen, the algae cells are cultured in a culture medium with rich carbon sources to generate a large amount of algae microorganisms, meanwhile, the algae cells can utilize various inorganic nitrogen and organic nitrogen compounds in water as nitrogen sources, carbon dioxide and nitrate are used as carbon sources to carry out photoautotrophic growth, nitrate, nitrite and ammonium salt absorbed by the algae cells can be used for synthesizing substances such as amino acid, protein and the like, a plant area utilizes two plants capable of adsorbing nitrogen to carry out grafting, the denitrification capability of the two plants can be simultaneously embodied, and the root absorption range and capability are expanded, thereby improving the denitrification treatment efficiency, and the nitrate nitrogen of the tail water of the sewage plant in the catalysis-electrolysis area is firstly converted into ammonia nitrogen under the catalysis of the solid catalytic particle filler in the reactor and then is further converted into nitrogen. The invention relates to a denitrification treatment system for tail water of sewage treatment, each pair of areas has certain effect on denitrification and are jointly treated, so that the denitrification treatment efficiency is improved.
Drawings
FIG. 1 shows a process flow of a denitrification treatment system for tail water from sewage treatment.
Detailed Description
The base material is prepared from the following raw materials in a mass ratio of 7-8: 3-4: 1-2, mixing the river sediment, the diatomite and the cobblestones to obtain a mixture, namely the bottom material.
The preparation method of the treating agent comprises the following steps: mixing 40-50 parts of water, 20-30 parts of glutamine, 10-15 parts of glucose and 7-8 parts of sodium chloride in parts by weight, and sterilizing at high temperature to obtain a nutrient solution, wherein the mass ratio of the components is 1: 3-4, performing mixed culture on soybean roots and a nutrient solution, culturing for 2-3 d, filtering to obtain filter residues, placing the filter residues in a culture chamber for culturing until hyphae appear, obtaining hypha filter residues, washing the hypha filter residues with deionized water, collecting washing liquid, injecting the washing liquid into blue-green algae, wherein the injection amount is 50-80 mL, obtaining blue-green algae after injection, mixing 40-50 parts of water, 20-30 parts of peptone, 10-15 parts of glucose, 7-8 parts of sodium chloride and 1-2 parts of sodium carbonate in parts by weight, and performing high-temperature sterilization to obtain a culture solution, wherein the mass ratio of the culture solution is 1: and 3-4, mixing the blue algae after injection with a culture solution, soaking for 4-5 days, and filtering to obtain soaked filter residues, namely the treating agent.
The biological bottom material is prepared from the following raw materials in a mass ratio of 7-8: 3-4: 1-2, mixing the pond sludge, the laterite and the gravel to obtain a mixture, and obtaining the biological bed charge.
The method comprises the following steps of obliquely cutting the side face of the root of a small leaf willow to a position with the root diameter of 1/3 and the length of 2-3 cm, taking branches with 2-3 buds of jasmine, cutting one side of a scion into an inclined plane with the length of 2-3 cm, cutting the opposite side of the scion into a short inclined plane with the length of 1-2 cm, mixing 40-50 parts of water, 20-30 parts of peptone, 10-15 parts of glucose and 7-8 parts of sodium chloride in parts by weight, and sterilizing at high temperature to obtain a nutrient solution a, wherein the mass ratio of the nutrient solution a to the nutrient solution a is 1: 1: 3, putting the oblique cutting plane of the side face of the root of the salix lobular and the short oblique plane of the jasmine branch into the nutrient solution a, soaking for 1-2 hours, taking out, inserting the scion aiming at the cambium of the root, and bundling the scion and the interface of the stock by using a plastic film to obtain the improved plant.
The solid catalytic particles are manganese dioxide.
A denitrification treatment system for tail water of sewage treatment comprises the following steps:
(1) promote sewage treatment plant's tail water to the filtering area and carry out filtration treatment to set up the filter plate that the clearance is 5~10mm in the inside filter plate that is equipped with of filtering area, and the filter plate below is equipped with the filter screen, loads the active carbon in the filter screen:
(2) discharging the filtered tail water of the sewage treatment plant to a treatment area, wherein a bottom material is arranged at the bottom of the treatment area, and adding a treating agent with the mass of 10-15% of the tail water of the sewage treatment plant into the treatment area for treatment for 1-2 h;
(3) conveying the treated tail water of the sewage treatment plant to a plant area, wherein a biological bed charge is arranged at the bottom of the plant area, and improved plants are planted on the surface of the plant area for adsorption for 2-3 hours;
(4) discharging the tail water of the sewage treatment plant after adsorption to a catalysis-electrolysis region, and adding solid catalytic particles with the mass of 5-8% of the tail water of the sewage treatment plant into the catalysis-electrolysis region for electrolysis, wherein the current is 32-34 mA, and the hydraulic retention time is 30-40 min;
(5) and conveying the electrolyzed water to a disinfection area for disinfection, and discharging water after disinfection.
Example 1
The bottom materials are as follows by mass ratio of 7: 3: 1, mixing the river sediment, the diatomite and the cobblestones to obtain a mixture, namely the bottom material.
The preparation method of the treating agent comprises the following steps: mixing 40 parts of water, 20 parts of glutamine, 10 parts of glucose and 7 parts of sodium chloride in parts by weight, and sterilizing at high temperature to obtain a nutrient solution, wherein the mass ratio of the components is 1: 3, performing mixed culture on soybean roots and a nutrient solution, culturing for 2-3 d, filtering to obtain filter residues, placing the filter residues in a culture chamber for culturing until hyphae appear, obtaining hypha filter residues, washing the hypha filter residues with deionized water, collecting a washing solution, injecting the washing solution into blue-green algae, wherein the injection amount is 50mL, obtaining blue-green algae after injection, mixing 40 parts of water, 20 parts of peptone, 10 parts of glucose, 7 parts of sodium chloride and 1 part of sodium carbonate according to parts by weight, and performing high-temperature sterilization to obtain a culture solution, wherein the culture solution is prepared by the following steps of: 3, mixing the blue algae after injection with the culture solution, soaking for 4d, and filtering to obtain soaking filter residues, namely the treating agent.
The biological bottom material comprises the following components in percentage by mass: 3: 1, mixing the pond sludge, the laterite and the gravels to obtain a mixture, namely the biological bed charge.
Beveling the side face of the root of the salix lobus, cutting into a position with the root diameter of 1/3, wherein the length is 2cm, taking a branch with 2 buds of jasmine, cutting one side of a scion into a 2cm inclined plane, cutting the opposite side of the scion into a short inclined plane with the length of 1cm, mixing 40 parts of water, 20 parts of peptone, 10 parts of glucose and 7 parts of sodium chloride in parts by weight, and sterilizing at high temperature to obtain a nutrient solution a, wherein the mass ratio of the nutrient solution a to the branch is 1: 1: 3, putting the oblique cutting plane of the side face of the root of the salix lobular and the short oblique plane of the jasmine branch into the nutrient solution a, soaking for 1h, taking out, inserting the scion aiming at the cambium of the root, and bundling the scion and the interface of the stock by using a plastic film to obtain the improved plant.
The solid catalytic particles are manganese dioxide.
A denitrification treatment system for tail water of sewage treatment comprises the following steps:
(1) promote sewage treatment plant's tail water to the filtering area and carry out filtration treatment to set up the filter plate that the clearance is 5mm in the inside filter plate that is equipped with of filtering area, and the filter plate below is equipped with the filter screen, loads the active carbon in the filter screen:
(2) discharging the filtered tail water of the sewage treatment plant to a treatment area, wherein a bottom material is arranged at the bottom of the treatment area, and adding a treatment agent with the mass of 10% of the tail water of the sewage treatment plant into the treatment area for treatment for 1 hour;
(3) conveying the treated tail water of the sewage treatment plant to a plant area, wherein the bottom of the plant area is provided with biological bed charge, and modified plants are planted on the surface of the plant area for adsorption for 2 hours;
(4) discharging the tail water of the sewage treatment plant after adsorption to a catalysis-electrolysis region, and adding solid catalytic particles accounting for 5% of the tail water of the sewage treatment plant in mass into the catalysis-electrolysis region for electrolysis, wherein the current is 32mA, and the hydraulic retention time is 30 min;
(5) and conveying the electrolyzed water to a disinfection area for disinfection, and discharging water after disinfection.
Example 2
The bottom materials are mixed according to the mass ratio of 4: 2: 1, mixing the river sediment, the diatomite and the cobblestones to obtain a mixture, namely the bottom material.
The preparation method of the treating agent comprises the following steps: mixing 50 parts of water, 30 parts of glutamine, 15 parts of glucose and 8 parts of sodium chloride in parts by weight, and sterilizing at high temperature to obtain a nutrient solution, wherein the mass ratio of the nutrient solution to the nutrient solution is 1: and 4, performing mixed culture on soybean roots and a nutrient solution, culturing for 3d, filtering to obtain filter residues, placing the filter residues in a culture chamber for culture until hyphae appear to obtain hyphae filter residues, washing the hyphae filter residues with deionized water, collecting washing liquid, injecting the washing liquid into blue-green algae, wherein the injection amount is 50-80 mL, obtaining the blue-green algae after injection, mixing 50 parts of water, 30 parts of peptone, 15 parts of glucose, 8 parts of sodium chloride and 2 parts of sodium carbonate according to parts by weight, and performing high-temperature sterilization to obtain a culture solution, wherein the culture solution is prepared by the following steps of: and 4, mixing the blue algae after injection with the culture solution, soaking for 5d, and filtering to obtain soaked filter residues, namely the treating agent.
The biological bottom material comprises the following components in percentage by mass 4: 2: 1, mixing the pond sludge, the laterite and the gravels to obtain a mixture, namely the biological bed charge.
Beveling the side face of the root of the salix lobus, cutting into a position with the root diameter of 1/3 and the length of 2.5cm, taking a branch with 2 buds of jasmine, cutting one side of a scion into an inclined plane with the length of 2cm, cutting the opposite side of the scion into a short inclined plane with the length of 1cm, mixing 45 parts of water, 25 parts of peptone, 12 parts of glucose and 7 parts of sodium chloride in parts by weight, and sterilizing at high temperature to obtain a nutrient solution a, wherein the mass ratio of the nutrient solution a to the branch is 1: 1: 3, putting the oblique cutting plane of the side face of the root of the salix lobular and the short oblique plane of the jasmine branch into the nutrient solution a, soaking for 1.5h, taking out, inserting the scion aiming at the cambium of the root, and bundling the scion and the interface of the stock by using a plastic film to obtain the improved plant.
The solid catalytic particles are manganese dioxide.
A denitrification treatment system for tail water of sewage treatment comprises the following steps:
(1) promote sewage treatment plant's tail water to the filtering area and carry out filtration treatment to set up the filter plate that the clearance is 10mm in the inside filter plate that is equipped with of filtering area, and the filter plate below is equipped with the filter screen, loads the active carbon in the filter screen:
(2) discharging the filtered tail water of the sewage treatment plant to a treatment area, wherein a bottom material is arranged at the bottom of the treatment area, and adding a treatment agent accounting for 15% of the mass of the tail water of the sewage treatment plant into the treatment area for treatment for 2 hours;
(3) conveying the treated tail water of the sewage treatment plant to a plant area, wherein the bottom of the plant area is provided with biological bed charge, and modified plants are planted on the surface of the plant area for adsorption for 3 hours;
(4) discharging the tail water of the sewage treatment plant after adsorption to a catalysis-electrolysis region, and adding solid catalytic particles with the mass of 5-8% of the tail water of the sewage treatment plant into the catalysis-electrolysis region for electrolysis, wherein the current is 34mA, and the hydraulic retention time is 40 min;
(5) and conveying the electrolyzed water to a disinfection area for disinfection, and discharging water after disinfection.
Example 3
The bottom material is prepared from the following raw materials in a mass ratio of 7.5: 3.5: 1.5, mixing the river sediment, the diatomite and the cobblestones to obtain a mixture, namely the bottom material.
The preparation method of the treating agent comprises the following steps: according to the weight portion, 45 portions of water, 25 portions of glutamine, 12.5 portions of glucose and 7.5 portions of sodium chloride are mixed and sterilized at high temperature to obtain nutrient solution, and the weight ratio of the nutrient solution to the components is 1: 3.5, performing mixed culture on soybean roots and a nutrient solution, culturing for 2.5d, filtering to obtain filter residues, placing the filter residues in a culture chamber for culturing until hyphae appear, obtaining hypha filter residues, washing the hypha filter residues with deionized water, collecting washing liquid, injecting the washing liquid into blue-green algae, wherein the injection amount is 65mL, obtaining blue-green algae after injection, mixing 45 parts of water, 25 parts of peptone, 12.5 parts of glucose, 7.5 parts of sodium chloride and 1.5 parts of sodium carbonate according to parts by weight, and performing high-temperature sterilization to obtain a culture solution, wherein the culture solution comprises the following components in parts by weight of 1: 3.5, mixing the blue algae after injection with the culture solution, soaking for 4.5 days, and filtering to obtain soaking filter residues, namely the treating agent.
The biological bottom material is prepared from the following raw materials in a mass ratio of 7.5: 3.5: 1.5, mixing the pond sludge, the laterite and the gravels to obtain a mixture, namely the biological bed charge.
Beveling the side face of the root of the salix lobus, cutting into a position with the root diameter of 1/3, wherein the length is 3cm, taking branches with 3 buds of jasmine, cutting one surface of a scion into an inclined plane with the length of 3cm, cutting the opposite side of the scion into a short inclined plane with the length of 2cm, mixing 50 parts by weight of water, 30 parts by weight of peptone, 15 parts by weight of glucose and 8 parts by weight of sodium chloride, and sterilizing at high temperature to obtain a nutrient solution a, wherein the mass ratio of the nutrient solution a to the parts by weight of water to the parts by weight of peptone, 15 parts: 1: 3, putting the oblique cutting plane of the side face of the root of the salix lobular and the short oblique plane of the jasmine branch into the nutrient solution a for soaking for 2 hours, taking out, inserting the scion aiming at the cambium of the root, and bundling the scion and the interface of the stock by using a plastic film to obtain the improved plant.
The solid catalytic particles are manganese dioxide.
A denitrification treatment system for tail water of sewage treatment comprises the following steps:
(1) promote sewage treatment plant's tail water to the filtering area and carry out filtration treatment to set up the filter plate that the clearance is 7.5mm in the inside filter plate that is equipped with of filtering area, and the filter plate below is equipped with the filter screen, loads the active carbon in the filter screen:
(2) discharging the filtered tail water of the sewage treatment plant to a treatment area, wherein a bottom material is arranged at the bottom of the treatment area, and adding a treating agent accounting for 12.5 percent of the mass of the tail water of the sewage treatment plant into the treatment area for treatment for 1.5 hours;
(3) conveying the treated tail water of the sewage treatment plant to a plant area, wherein the bottom of the plant area is provided with biological bed charge, and modified plants are planted on the surface of the plant area for adsorption for 2.5 hours;
(4) discharging the tail water of the sewage treatment plant after adsorption to a catalysis-electrolysis region, and adding solid catalytic particles with the mass of 6.5% of the tail water of the sewage treatment plant into the catalysis-electrolysis region for electrolysis, wherein the current is 33mA and the hydraulic retention time is 35 min;
(5) and conveying the electrolyzed water to a disinfection area for disinfection, and discharging water after disinfection.
Comparative example: a tail water treatment system provided by a certain company in Tianjin.
1L of tail water of a certain sewage treatment plant is selected, the tail water is treated by the treatment system of the invention and the treatment system of the comparative example respectively, and experimental data are recorded. Before treatment, the COD concentration is 105 mg/L, BOD mg/L, and the ammonia nitrogen concentration is 68 mg/L. The test data are shown in table 1.
Table 1:
in conclusion, the tail water treatment system has good denitrification effect and high water transparency, and is worthy of popularization and application.
Claims (1)
1. A denitrification treatment method for tail water of a sewage treatment plant is characterized by comprising the following steps:
(1) lifting the tail water of the sewage treatment plant to a filtering area for filtering treatment, and arranging a filter plate inside the filtering area:
(2) discharging the filtered tail water of the sewage treatment plant to a treatment area, wherein a bottom material is arranged at the bottom of the treatment area, and adding a treatment agent with the mass of 10-15% of the tail water of the sewage treatment plant into the treatment area for treatment; the base material is prepared from the following raw materials in a mass ratio of 7-8: 3-4: 1-2, mixing the river sediment, diatomite and cobblestones to obtain a mixture, namely a bottom material;
the preparation method of the treating agent comprises the following steps: mixing 40-50 parts of water, 20-30 parts of glutamine, 10-15 parts of glucose and 7-8 parts of sodium chloride in parts by weight, and sterilizing at high temperature to obtain a nutrient solution, wherein the mass ratio of the components is 1: 3-4, performing mixed culture on soybean roots and a nutrient solution, culturing for 2-3 d, filtering to obtain filter residues, placing the filter residues in a culture chamber for culturing until hyphae appear, obtaining hypha filter residues, washing the hypha filter residues with deionized water, collecting washing liquid, injecting the washing liquid into blue-green algae, wherein the injection amount is 50-80 mL, obtaining blue-green algae after injection, mixing 40-50 parts of water, 20-30 parts of peptone, 10-15 parts of glucose, 7-8 parts of sodium chloride and 1-2 parts of sodium carbonate in parts by weight, and performing high-temperature sterilization to obtain a culture solution, wherein the mass ratio of the culture solution is 1: 3-4, mixing the blue algae after injection with a culture solution, soaking for 4-5 days, and filtering to obtain soaked filter residues, namely the treating agent;
(3) conveying the treated tail water of the sewage treatment plant to a plant area, wherein the bottom of the plant area is provided with biological bed charge, and modified plants are planted on the surface of the plant area for adsorption; the biological bottom material is prepared from the following raw materials in a mass ratio of 7-8: 3-4: 1-2, mixing the pond sludge, the laterite and the gravel to obtain a mixture, namely the biological bottom material;
the improved plant is obtained by beveling the side face of the root of salix lobular with one cut at 1/3 parts of root diameter and 2-3 cm in length, taking branches of jasmine with 2-3 buds, cutting one side of a scion into 2-3 cm inclined planes, cutting the opposite side of the scion into a short inclined plane with the length of 1-2 cm, mixing 40-50 parts by weight of water, 20-30 parts by weight of peptone, 10-15 parts by weight of glucose and 7-8 parts by weight of sodium chloride, and performing high-temperature sterilization to obtain a nutrient solution a, wherein the weight ratio of the nutrient solution a to the nutrient solution a is 1: 1: 3, putting the oblique cut plane of the side face of the root of the salix lobular and the short oblique plane of the jasmine branch into the nutrient solution a, soaking for 1-2 hours, taking out, inserting the scion aiming at the cambium of the root, and bundling the scion and the interface of the stock by using a plastic film to obtain the improved plant;
(4) discharging the adsorbed tail water of the sewage treatment plant to a catalysis-electrolysis zone, and adding solid catalytic particles with the mass of 5-8% of the tail water of the sewage treatment plant into the catalysis-electrolysis zone for electrolysis; the solid catalytic particles are manganese dioxide;
(5) and conveying the electrolyzed water to a disinfection area for disinfection, and discharging water after disinfection.
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