Integrated control of toxicity of organic micro-pollutants in secondary effluent regeneration treatment process

Abstract

The present application relates to wastewater treatment technical field, and disclose a kind of secondary effluent regeneration treatment process for comprehensively regulating organic micro-pollutant toxicity, copper nanoparticles are loaded carbon nanotube by phase inversion method, polyethylene glycol 1000 is used to modify polyamide, and modified polyamide reverse osmosis membrane is obtained, copper nanoparticles are loaded carbon nanotube in polyamide reverse osmosis membrane in formation three-dimensional physical crosslinking network, improve the water flux, interception efficiency and desalination rate of reverse osmosis membrane.Carbon nanotube loaded copper nanoparticles can improve the antibacterial property and anti-pollution property of reverse osmosis membrane as antibacterial agent.Mixed aqueous solution of tetracycline, methylene blue, bovine serum albumin and sodium chloride is used to simulate secondary effluent of sewage treatment plant, after ozone reaction tower, adsorption pool adsorption filtration, reverse osmosis membrane and other process treatment, with the advantages of high interception rate and removal rate efficiency of organic pollutants, good desalination rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to a secondary effluent regeneration treatment process for comprehensively regulating the toxicity of organic micro-pollutants. BACKGROUND

[0002] The underground storage of reclaimed water with municipal wastewater treatment plant effluent as source water is an important strategy to solve water resource shortage and water environmental pollution problems. Water quality safety and risk prevention and control are the primary concerns in the field of scientific research and engineering practice of underground storage of reclaimed water, and are the main factors restricting the wide application of reclaimed water.

[0003] The underground storage of reclaimed water with municipal wastewater treatment plant effluent as source water uses the underground aquifer space to store reclaimed water resources for subsequent use. It is concerned because it has the dual functions of wastewater treatment plant effluent resource utilization and groundwater system conservation, especially in arid / semi-arid regions, which has significant implications in terms of alleviating water resource shortage crisis, improving water resource utilization efficiency, and improving water environmental quality. However, this process has the risk of introducing toxic and harmful substances into groundwater, especially the impact of organic micro-pollutants and their transformation products on the subsequent use of reclaimed water cannot be ignored. In recent years, trace organic pollutants with high risk, difficult to remove and easy to accumulate in the body, such as endocrine disruptors, pharmaceuticals and personal care products, and industrial additives, have been detected in municipal wastewater. These pollutants can have a profound impact on the endocrine system involved in normal physiological functions of the human body, causing serious harm to human reproductive capacity, immunity, and other aspects. Therefore, water quality safety and risk prevention and control are the primary concerns in the field of scientific research and engineering practice of underground storage of reclaimed water.

[0004] Reverse osmosis is widely used in the regeneration treatment of secondary effluent from wastewater treatment plants. For example, the document "Pilot Test of Coagulation and Membrane Separation for Treatment of Secondary Effluent from Pharmaceutical Wastewater" reports the use of coagulation-ultrafiltration-reverse osmosis membrane process to treat secondary effluent from wastewater treatment plants. The removal rates of turbidity and COD are high, the desalination rate of reverse osmosis process water is above 97.6%, and the effluent meets the water quality indicators for recycling. Patent CN110479119B "Preparation method of polyamide composite reverse osmosis membrane" discloses an interfacial polymerization reaction of water-phase monomer and oil-phase monomer on the surface of nanofiber membrane. By adding silica nano-structures with chiral channels and organic solvents to the water-phase solution, a three-dimensional network-like pore structure is formed on the filtration membrane. The prepared polyamide composite reverse osmosis membrane has excellent performance in terms of high flux and high retention capacity. The present application provides a copper nanoparticle-loaded carbon nanotube and polyethylene glycol modified polyamide reverse osmosis membrane for use in a secondary effluent regeneration treatment process for comprehensively regulating the toxicity of organic micro-pollutants. SUMMARY

[0005] (1) Technical problems solved

[0006] In view of the deficiencies of the prior art, the application provides a copper nanoparticle loaded carbon nanotube and polyethylene glycol modified polyamide reverse osmosis membrane for a secondary effluent regeneration treatment process for comprehensively regulating the toxicity of organic micro-pollutants.

[0007] (II) Technical scheme

[0008] The secondary effluent regeneration treatment process for comprehensively regulating the toxicity of organic micro-pollutants: a mixed aqueous solution containing 1 mg / L tetracycline, 2 mg / L methylene blue, 2 mg / L bovine milk albumin and 500 mg / L sodium chloride is used to simulate the secondary effluent of a sewage plant, and is introduced into an ozone reaction tower for treatment, then is subjected to adsorption and filtration treatment in an adsorption tank containing activated carbon, is subjected to flocculation treatment in a coagulation reactor, then is introduced into a sand filter tank for separate water backwashing, and finally is subjected to reverse osmosis treatment by the modified polyamide reverse osmosis membrane.

[0009] Preferably, the ozone dosage in the ozone reaction tower is 0.5-1.5 mg / L, and the ozone contact time is 5-12 min.

[0010] Preferably, the amount of activated carbon in the adsorption tank is 100-500 g / L, and the adsorption and filtration treatment time is 10-30 min.

[0011] Preferably, the coagulation reactor contains a flocculant, the flocculant includes any one or a combination of polyaluminum oxide, polyaluminum sulfate, polyferric sulfate, polyferric chloride, polymeric ferric sulfate, and the flocculation treatment time is 10-20 min.

[0012] Preferably, the backwashing intensity of the separate water backwashing in the sand filter tank is 10-20 L / s·m 2 , and the backwashing time is 5-10 min.

[0013] Preferably, the pressure of the reverse osmosis treatment is 0.8-1.2 kPa, and the water inlet temperature is 20-30 DEG C.

[0014] Preferably, the preparation method of the modified polyamide reverse osmosis membrane is as follows:

[0015] (1) amino-functionalized carbon nanotubes, glutaraldehyde and dopamine are added to an ethanol solvent, and after ultrasonic dispersion treatment, they are reacted at 50-70 DEG C for 6-12 h, then after reaction, the mixture is subjected to suction filtration, and the precipitate is washed with ethanol to obtain dopamine modified carbon nanotubes.

[0016] (2) The dopamine modified carbon nanotubes are immersed into a copper nitrate solution, ultrasonic dispersion treatment is carried out, and then stirring is carried out at room temperature for 4-12 hours; after reaction, extraction filtration is carried out, and then deionized water washing is carried out; then the product is placed in an atmosphere furnace, and heated to 400-450 DEG C under an argon atmosphere; after being kept for 30-60 minutes, hydrogen and argon mixed gas is introduced, and kept for 2-4 hours, to obtain copper nanoparticle loaded carbon nanotubes.

[0017] (3) The copper nanoparticle loaded carbon nanotubes are added into N,N-dimethylacetamide, ultrasonic dispersion treatment is carried out, and then polyethylene glycol and polyamide are added; after stirring, the solution is left to stand and defoaming, to form a casting solution; then the casting solution is scraped on a glass plate by using a doctor blade, and then immersed into distilled water for solidification and film formation; the film is washed by using distilled water to remove the solvent and polyethylene glycol, to obtain a modified polyamide reverse osmosis membrane.

[0018] Preferably, the mass ratio of the amino-functionalized carbon nanotubes, glutaraldehyde and dopamine is 1:2-5:2.5-7.

[0019] Preferably, the mass concentration of the copper nitrate solution is 20-100 g / L.

[0020] Preferably, the amount of the copper nanoparticle loaded carbon nanotubes is 1-4% of the mass of the polyamide.

[0021] (Three) Beneficial technical effects

[0022] In the present application, glutaraldehyde is used as a crosslinking agent, and the amino-functionalized carbon nanotubes and dopamine are crosslinked to obtain dopamine modified carbon nanotubes; the introduced catechol structure is complexed with copper ions, and the copper ions are uniformly loaded on the surface of the carbon nanotubes; then hydrogen reduction is carried out, and copper nanoparticles are generated in situ on the surface of the carbon nanotubes. The phase inversion method is used to modify the polyamide by using the copper nanoparticle loaded carbon nanotubes and polyethylene glycol 1000, to obtain a modified polyamide reverse osmosis membrane; the copper nanoparticle loaded carbon nanotubes form a three-dimensional physical crosslinking network in the polyamide reverse osmosis membrane, and the water flux, the rejection efficiency and the desalination rate of the reverse osmosis membrane are improved. The copper nanoparticles loaded on the carbon nanotubes can improve the antibacterial property and the anti-fouling property of the reverse osmosis membrane. The mixed aqueous solution of tetracycline, methylene blue, bovine whey protein and sodium chloride is used to simulate the secondary effluent of a sewage treatment plant, and the secondary effluent is treated by using an ozone reaction tower, an adsorption tank, a reverse osmosis membrane and the like, and the method has the advantages of high rejection rate and removal rate of organic pollutants and good desalination rate. DETAILED DESCRIPTION

[0023] The amino-functionalized carbon nanotubes have the following properties: purity: >95%; content of -NH2: 0.45 wt%; outer diameter: 8-15 nm; and inner diameter: 2-4 nm.

[0024] Polyamide: brand: LGBW400R; Tangrun Environmental Protection Technology Co., Ltd.

[0025] Example 1

[0026] (1) 0.2 g of aminated carbon nanotubes, 0.4 g of glutaraldehyde and 0.5 g of dopamine were added to an ethanol solvent, and after ultrasonic dispersion treatment, they were reacted at 50℃ for 12 h. After the reaction, the precipitate was washed with ethanol by suction filtration, and dopamine-modified carbon nanotubes were obtained.

[0027] (2) 0.5 g of dopamine-modified carbon nanotubes were immersed in 100 mL of a 6 g / L copper nitrate solution, and after ultrasonic dispersion treatment, they were stirred at room temperature for 8 h. After the reaction, the product was washed with deionized water by suction filtration, and then the product was heated to 400℃ in an argon atmosphere in a gas furnace, and kept for 40 min. Hydrogen and argon mixed gas was introduced, and the product was kept for h to obtain copper nanoparticle-loaded carbon nanotubes.

[0028] (3) 0.5 g of copper nanoparticle-loaded carbon nanotubes were added to N,N-dimethylacetamide, and after ultrasonic dispersion treatment, 30 g of polyethylene glycol 1000 and 50 g of polyamide were added. After stirring uniformly, the solution was left to stand to degas, forming a casting solution. Then the casting solution was coated on a glass plate with a doctor blade, and then immersed in distilled water to solidify the film. The film was washed with distilled water to remove the solvent and polyethylene glycol, and a modified polyamide reverse osmosis membrane PA1 was obtained.

[0029] (4) A mixed aqueous solution containing 1 mg / L tetracycline, 2 mg / L methylene blue, 2 mg / L bovine whey protein and 500 mg / L sodium chloride was used to simulate secondary effluent from a sewage treatment plant. The ozone dosage was 1.5 mg / L, and the ozone contact time was 5 min. Then the effluent was treated by adsorption filtration in an adsorption tank containing activated carbon, the amount of activated carbon was 100 g / L, and the adsorption filtration time was 30 min. Then the effluent was treated by flocculation in a coagulation reactor, the flocculant was polyaluminum hydroxide, and the flocculation time was 15 min. Subsequently, the effluent was treated by separate water backwashing in a sand filter, the washing intensity was 20 L / s·m 2 , the washing time was 5 min, and finally the effluent was treated by reverse osmosis through the modified polyamide reverse osmosis membrane PA1, the pressure was 1.2 kPa, and the water temperature was 30℃.

[0030] Example 2

[0031] (1) 0.2 g of aminated carbon nanotubes, 0.5 g of glutaraldehyde and 0.8 g of dopamine were added to an ethanol solvent, and after ultrasonic dispersion treatment, they were reacted at 70℃ for 10 h. After the reaction, the precipitate was washed with ethanol by suction filtration, and dopamine-modified carbon nanotubes were obtained.

[0032] (2) 0.5 g of dopamine modified carbon nanotubes was immersed into 100 mL of 20 g / L copper nitrate solution, after ultrasonic dispersion treatment, stirring at room temperature for 4 h, after reaction, suction filtration, deionized water washing, then the product was in the atmosphere furnace, in argon atmosphere, heated to 450℃, holding for 30 min, in the mixed gas of hydrogen and argon, holding for 3 h, to obtain copper nanoparticles loaded carbon nanotubes.

[0033] (3) 1 g of copper nanoparticles loaded carbon nanotubes was added into N,N-dimethylacetamide, after ultrasonic dispersion treatment, 30 g of polyethylene glycol 1000 and 50 g of polyamide were added, after stirring uniformly, the solution was left to stand to degas, forming a casting solution, then the casting solution was coated on a glass plate by doctor blade, then immersed into distilled water to solidify into a film, the film was washed by distilled water to remove solvent and polyethylene glycol, to obtain modified polyamide reverse osmosis membrane PA2.

[0034] (4) The mixed aqueous solution containing 1 mg / L tetracycline, 2 mg / L methylene blue, 2 mg / L bovine whey protein and 500 mg / L sodium chloride was used to simulate the secondary effluent of sewage plant, and was introduced into an ozone reaction tower for treatment, the ozone dosage was 1.5 mg / L, and the ozone contact time was 5 min; then the adsorption and filtration treatment was carried out in an adsorption tank containing activated carbon, the amount of activated carbon was 200 g / L, and the adsorption and filtration treatment time was 20 min; then the flocculation treatment was carried out in a coagulation reactor, the flocculant was polyaluminum oxide, and the flocculation treatment time was 15 min; then the single water backwashing was carried out in a sand filter tank, the washing intensity was 10 L / s·m 2 , the washing time was 10 min, and finally the reverse osmosis treatment was carried out through the modified polyamide reverse osmosis membrane PA2, the pressure was 1 kPa, and the water temperature was 20℃.

[0035] Example 3

[0036] (1) 0.2 g of aminated carbon nanotubes, 1 g of glutaraldehyde and 1.4 g of dopamine were added into an ethanol solvent, after ultrasonic dispersion treatment, reaction at 70℃ for 8 h, after reaction, suction filtration, ethanol washing of the precipitate, to obtain dopamine modified carbon nanotubes.

[0037] (2) 0.5 g of dopamine modified carbon nanotubes was immersed into 100 mL of 100 g / L copper nitrate solution, after ultrasonic dispersion treatment, stirring at room temperature for 4 h, after reaction, suction filtration, deionized water washing, then the product was in the atmosphere furnace, in argon atmosphere, heated to 450℃, holding for 60 min, in the mixed gas of hydrogen and argon, holding for 3 h, to obtain copper nanoparticles loaded carbon nanotubes.

[0038] (3) 2 g of copper nanoparticle loaded carbon nanotubes were added to N, N- dimethylacetamide, and after ultrasonic dispersion treatment, 30 g of polyethylene glycol 1000 and 50 g of polyamide were added. After stirring, the solution was left to stand to remove bubbles, forming a casting solution. The casting solution was then coated on a glass plate using a doctor blade, and then immersed in distilled water to solidify and form a film. The film was washed with distilled water to remove the solvent and polyethylene glycol, and a modified polyamide reverse osmosis membrane PA3 was obtained.

[0039] (4) A mixed aqueous solution containing 1 mg / L tetracycline, 2 mg / L methylene blue, 2 mg / L bovine whey protein, and 500 mg / L sodium chloride was used to simulate secondary effluent from a sewage treatment plant. The simulated secondary effluent was treated by passing through an ozone reaction tower at an ozone dosage of 1.5 mg / L and an ozone contact time of 7 min. Then, the effluent was treated by adsorption filtration in an adsorption tank containing activated carbon at a dosage of 100 g / L for 10 min. Subsequently, the effluent was treated by flocculation in a coagulation reactor using polyaluminum hydroxide as the flocculant for 10 min. Then, the effluent was treated by separate water backwashing in a sand filter at a washing intensity of 15 L / s·m2 and a washing time of 8 min. Finally, the effluent was treated by reverse osmosis using the modified polyamide reverse osmosis membrane PA3 at a pressure of 1.2 kPa and an inlet water temperature of 20°C. 2

[0040] Example 4

[0041] (1) 0.2 g of amino-functionalized carbon nanotubes, 0.8 g of glutaraldehyde, and 1.2 g of dopamine were added to an ethanol solvent, and after ultrasonic dispersion treatment, the mixture was reacted at 60°C for 8 h. After reaction, the mixture was suction filtered and the precipitate was washed with ethanol to obtain dopamine-modified carbon nanotubes.

[0042] (2) 0.5 g of dopamine-modified carbon nanotubes were immersed in 100 mL of a 20 g / L copper nitrate solution, and after ultrasonic dispersion treatment, the mixture was stirred at room temperature for 12 h. After reaction, the mixture was suction filtered and washed with deionized water. Then, the product was heated to 450°C in an argon atmosphere in a furnace, and after maintaining the temperature for 3 min, a mixture of hydrogen and argon was introduced, and the temperature was maintained for 4 h to obtain copper nanoparticle loaded carbon nanotubes.

[0043] (3) 1.5 g of copper nanoparticle loaded carbon nanotubes were added to N, N- dimethylacetamide, and after ultrasonic dispersion treatment, 30 g of polyethylene glycol 1000 and 50 g of polyamide were added. After stirring, the solution was left to stand to remove bubbles, forming a casting solution. The casting solution was then coated on a glass plate using a doctor blade, and then immersed in distilled water to solidify and form a film. The film was washed with distilled water to remove the solvent and polyethylene glycol, and a modified polyamide reverse osmosis membrane PA4 was obtained.

[0044] ​(4) The simulated secondary effluent of sewage plant is treated by passing into an ozone reaction tower containing a mixed aqueous solution of 1 mg / L tetracycline, 2 mg / L methylene blue, 2 mg / L bovine milk albumin and 500 mg / L sodium chloride, the ozone dosage is 1.5 mg / L, the ozone contact time is 7 min; then the solution is treated by adsorption filtration in an adsorption tank containing activated carbon, the activated carbon dosage is 500 g / L, the adsorption filtration treatment time is 15 min; then the solution is treated by flocculation in a coagulation reactor, the flocculant is polyaluminum oxide, the flocculation treatment time is 20 min; then the solution is treated by separate water backwashing in a sand filter, the washing intensity is 10 L / s·m 2 , the washing time is 10 min, finally the solution is treated by reverse osmosis through a modified polyamide reverse osmosis membrane PA4, the pressure is 0.8 kPa, the water temperature is 25℃.

[0045] Example 5

[0046] (1) 0.2 g of amino-functionalized carbon nanotubes, 0.8 g of glutaraldehyde and 1.2 g of dopamine are added to an ethanol solvent, after ultrasonic dispersion treatment, the reaction is carried out at 50℃ for 12 h, after reaction, the precipitate is extracted by filtration and washed with ethanol to obtain dopamine-modified carbon nanotubes.

[0047] (2) 0.5 g of dopamine-modified carbon nanotubes is immersed in 100 mL of 50 g / L copper nitrate solution, after ultrasonic dispersion treatment, the solution is stirred at room temperature for 4 h, after reaction, the solution is extracted by filtration and washed with deionized water, then the product is heated to 400℃ in an argon atmosphere in a gas furnace, and kept for 50 min, and then heated to 400℃ in a hydrogen and argon mixed gas atmosphere and kept for 2 h to obtain copper nanoparticle-loaded carbon nanotubes.

[0048] (3) 1 g of copper nanoparticle-loaded carbon nanotubes is added to N,N-dimethylacetamide, after ultrasonic dispersion treatment, 30 g of polyethylene glycol 1000 and 50 g of polyamide are added, the solution is stirred uniformly and then left to stand to remove bubbles to form a casting solution, then the casting solution is coated on a glass plate by using a doctor blade, and then immersed in distilled water to solidify the film, and the film is washed with distilled water to remove solvents and polyethylene glycol to obtain a modified polyamide reverse osmosis membrane PA5.

[0049] (4) The simulated wastewater from a sewage plant secondary effluent containing 1 mg / L tetracycline, 2 mg / L methylene blue, 2 mg / L bovine serum albumin, and 500 mg / L sodium chloride was introduced into an ozone reaction tower for treatment, with an ozone dosage of 0.5 mg / L and an ozone contact time of 5 min; then adsorption and filtration treatment was performed in an adsorption tank containing activated carbon, with an activated carbon dosage of 200 g / L and an adsorption and filtration treatment time of 12 min; flocculation treatment was then performed in a coagulation reactor, with a flocculant of polyaluminum oxide and a flocculation treatment time of 15 min; subsequent separate water backwashing was performed in a sand filter, with a washing intensity of 10 L / s·m 2 , a washing time of 10 min, and finally reverse osmosis treatment was performed using a modified polyamide reverse osmosis membrane PA5, with a pressure of 0.8 kPa and an inlet water temperature of 30°C.

[0050] Comparative Example 1

[0051] (1) The simulated wastewater from a sewage plant secondary effluent containing 1 mg / L tetracycline, 2 mg / L methylene blue, 2 mg / L bovine serum albumin, and 500 mg / L sodium chloride was introduced into an ozone reaction tower for treatment, with an ozone dosage of 1 mg / L and an ozone contact time of 12 min; then adsorption and filtration treatment was performed in an adsorption tank containing activated carbon, with an activated carbon dosage of 200 g / L and an adsorption and filtration treatment time of 15 min; flocculation treatment was then performed in a coagulation reactor, with a flocculant of polyaluminum oxide and a flocculation treatment time of 10 min; subsequent separate water backwashing was performed in a sand filter, with a washing intensity of 10 L / s·m 2 , a washing time of 10 min, and finally reverse osmosis treatment was performed using a polyamide reverse osmosis membrane PA, with a pressure of 0.8 kPa and an inlet water temperature of 25°C.

[0052] The concentrations of tetracycline, methylene blue, and bovine serum albumin in the simulated wastewater after treatment in each example and comparative example were determined by ultraviolet-visible spectrophotometry, and the removal rates were calculated.

[0053]

[0054] The water contact angle and water flux of the polyamide reverse osmosis membrane were tested by a water contact angle tester and a water flux tester.

[0055] Polyamide reverse osmosis membrane pure water flux (L-m -2 ·h -1 )]]> Water contact angle (°) PA1 162.2 79.4 PA2 194.8 68.0 PA3 160.7 76.4 PA4 149.6 82.0 PA5 156.0 79.9 PA 120.9 93.2

[0056] The pure water flux of the polyamide reverse osmosis membrane modified by copper nanoparticle-loaded carbon nanotubes and polyethylene glycol 1000 reached 149.6-194.8 L·m -2 ·h -1 , and the water contact angle was only 68.0° at the lowest.

Claims

1. A secondary effluent regeneration treatment process for comprehensively regulating the toxicity of organic micro-pollutants, characterized in that: The secondary effluent regeneration treatment process is: a mixed aqueous solution containing 1 mg / L tetracycline, 2 mg / L methylene blue, 2 mg / L bovine whey protein and 500 mg / L sodium chloride is used to simulate secondary effluent of a sewage treatment plant, and is introduced into an ozone reaction tower for treatment, then is subjected to adsorption filtration treatment in an adsorption tank containing activated carbon, is subjected to flocculation treatment in a coagulation reactor, then is introduced into a sand filter tank for separate water backwashing, and finally is subjected to reverse osmosis treatment through a modified polyamide reverse osmosis membrane; The preparation method of the modified polyamide reverse osmosis membrane is: (1) amino-functionalized carbon nanotubes, glutaraldehyde and dopamine are added into an ethanol solvent, and after ultrasonic dispersion treatment, reaction is carried out at 50-70 DEG C for 6-12 h, after reaction, the product is extracted by filtration, and the precipitate is washed with ethanol to obtain dopamine-modified carbon nanotubes; (2) the dopamine-modified carbon nanotubes are immersed in a copper nitrate solution, and after ultrasonic dispersion treatment, stirring is carried out at room temperature for 4-12 h, after reaction, the product is extracted by filtration, and then is washed with deionized water, then the product is heated to 400-450 DEG C in an argon atmosphere in an atmosphere furnace, and is kept for 30-60 min, then a mixed gas of hydrogen and argon is introduced, and is kept for 2-4 h to obtain copper nanoparticle-loaded carbon nanotubes; (3) the copper nanoparticle-loaded carbon nanotubes are added into N,N-dimethylacetamide, and after ultrasonic dispersion treatment, polyethylene glycol and polyamide are added, and after stirring, the solution is left to stand to remove bubbles to form a casting solution, then the casting solution is coated on a glass plate by using a doctor blade, and then is immersed in distilled water to solidify into a membrane, and the membrane is washed with distilled water to remove solvents and polyethylene glycol to obtain a modified polyamide reverse osmosis membrane; The mass ratio of the amino-functionalized carbon nanotubes, glutaraldehyde and dopamine is 1:2-5:2.5-7; The amount of the copper nanoparticle-loaded carbon nanotubes is 1-4% of the mass of the polyamide.

2. The secondary effluent regeneration treatment process for integratively regulating the toxicity of organic micro-pollutants according to claim 1, characterized in that: The ozone dosage in the ozone reaction tower is 0.5-1.5 mg / L, and the ozone contact time is 5-12 min.

3. The secondary effluent regeneration treatment process for integratively regulating the toxicity of organic micro-pollutants according to claim 1, characterized in that: The amount of the activated carbon in the adsorption tank is 100-500 g / L, and the adsorption filtration treatment time is 10-30 min.

4. The secondary effluent regeneration treatment process for integratively regulating the toxicity of organic micro-pollutants according to claim 1, characterized in that: The coagulation reactor contains a flocculant, the flocculant includes any one or a combination of polyaluminum oxide, polyaluminum sulfate, polyferric sulfate, polyferric chloride and polymeric ferric sulfate, and the flocculation treatment time is 10-20 min.

5. The secondary effluent regeneration treatment process for integratively regulating the toxicity of organic micro-pollutants according to claim 1, characterized in that: The backwashing intensity of the separate water backwashing in the sand filter tank is 10-20 L / s·m, and the backwashing time is 5-10 min.

6. The secondary effluent regeneration treatment process for integratively regulating the toxicity of organic micro-pollutants according to claim 1, characterized in that: The pressure of the reverse osmosis treatment is 0.8-1.2 kPa, and the water inlet temperature is 20-30 DEG C.

7. The secondary effluent regeneration treatment process for integratively regulating the toxicity of organic micro-pollutants according to claim 1, characterized in that: The mass concentration of the copper nitrate solution is 20-100 g / L.

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