CN109650617B

CN109650617B - Integrated control combined treatment process and device for aquaculture wastewater

Info

Publication number: CN109650617B
Application number: CN201910024101.5A
Authority: CN
Inventors: 曾东; 许振成; 林方敏; 魏东洋; 洪鸿加; 胡习兵; 胡丽琼
Original assignee: South China Institute of Environmental Science of Ministry of Ecology and Environment
Current assignee: South China Institute of Environmental Science of Ministry of Ecology and Environment
Priority date: 2019-01-10
Filing date: 2019-01-10
Publication date: 2021-09-07
Anticipated expiration: 2039-01-10
Also published as: CN109650617A

Abstract

The invention discloses an integrated control combined treatment process and device for aquaculture wastewater, wherein the process comprises the following steps: s1: pre-treating; s2: oxidation treatment; s3: filtering; s4: adsorption treatment; the device mainly comprises a filtering tank, an adjusting tank, a decomposition tank, a pulse electric floating tank, an adsorption tank, a water pump and a PLC (programmable logic controller); the equalizing basin passes through intake pump one and filtering ponds intercommunication, and pulse electricity floats the pond and passes through suction pump four with decompose the pond intercommunication, the adsorption tank pass through suction pump five with pulse electricity float pond intercommunication PLC controller with filtering ponds, equalizing basin, decomposition pond, pulse electricity float pond, adsorption tank, suction pump, PLC controller electric connection. The invention has safe treatment process, no pollution and excellent degradation effect, and can reach the emission standard.

Description

Integrated control combined treatment process and device for aquaculture wastewater

Technical Field

The invention belongs to the technical field of wastewater treatment, and particularly relates to an integrated control culture wastewater combined treatment process and device.

Background

In recent years, intensive aquaculture is rapidly developed at home and abroad, China is more fierce, and the aquaculture yield of the intensive aquaculture accounts for about 2/3 of the world aquaculture yield. The prior aquaculture industry in China is in a historical transition period from a traditional high-yield stocking mode to large-scale cultivation and quality benefit transformation, but because the aquaculture in China still adopts a large-scale drainage mode, water resources are greatly consumed, and the water body, pond sediment and the like are polluted by the residues of the feed put in the aquaculture process and pollutants formed by the excrement of fishes, shrimps and crabs, so that the aquaculture water body is gradually eutrophicated, and the surrounding water area environment and the ecological environment are more and more damaged. Some lake-along culture areas of slow-flow shallow-water grass type lakes have serious damage to the aquaculture industry caused by a great variety of pathogenic microorganisms bred by pollutants under the combined action of domestic sewage and fishery self-pollution. The use of a large amount of fodder, fertilizer and chemical brings huge pressure for breeding the water, has surpassed the metabolic capability of the natural purification ecosystem that general breed relied on, leads to a large amount of organic matters can not totally decompose, causes the pollution of water, and the pollutant that the incomplete fodder of artifical aquaculture in-process and fish excrement formed causes water self to pollute and even quality of water worsens simultaneously, shows: the water body is seriously eutrophicated, the suspended matters in the water body are increased, the content of biological oxygen demand, chemical oxygen demand, nitrite nitrogen and the like is increased, and the dissolved oxygen is reduced. Compared with urban domestic sewage and industrial wastewater, the aquaculture water pollution has unique characteristics, namely low potential pollutant content, large primary drainage, difference with common land-source sewage, and greatly increased treatment difficulty.

In the prior art, although some treatment methods are mature aquaculture wastewater treatment methods, certain limitations still exist, a single water treatment technology cannot thoroughly treat various pollutants in the wastewater, a water treatment system formed by combining various water treatment technologies is required to treat the wastewater to realize recycling, suspended matters in the aquaculture wastewater, harmful substances such as ammonia and nitrite in the aquaculture wastewater, and pollutants such as heavy metals can be well removed systematically, the aquaculture wastewater treatment method is convenient to manage, safe and reliable, the cyclic utilization of the aquaculture wastewater is improved, and most of pollutants in the wastewater can be purified.

Disclosure of Invention

Aiming at the problems, the invention provides a combined treatment process and a device for aquaculture wastewater, which have the advantages of good treatment effect on harmful substances in the aquaculture wastewater, short time for degrading organic matters and realization of integrated control of efficient removal and disinfection of suspended matters.

The technical scheme of the invention is an integrated control aquaculture wastewater combined treatment process, which comprises the following steps:

s1: pretreatment: roughly filtering the aquaculture wastewater through a filtering tank, pumping the aquaculture wastewater into an adjusting tank, adjusting the pH value of the aquaculture wastewater to 6-7, adding a flocculating agent according to 0.1-0.3% of the inlet water mass, then adding a flocculating agent according to 0.1-0.3% of the inlet water mass, standing, and performing solid-liquid separation to obtain a supernatant; wherein, ultrasonic treatment with ultrasonic frequency of 100kHz is carried out 10min before the flocculant is added, and the ultrasonic treatment is stopped 5min after the flocculation is finished;

s2: oxidation treatment: adjusting the pH value of the supernatant obtained in the step S1 to 3-4, pumping the supernatant into a decomposition tank, performing pulse aeration treatment, keeping the gas circulation in the decomposition tank, and controlling the oxygen partial pressure in the decomposition tank to be 0.2-1.5 MPa; meanwhile, the circulating pipeline continuously atomizes and circulates the culture wastewater, the culture wastewater is treated for 2-4 hours, and then the culture wastewater is filtered by a filter membrane filter after the treatment is finished;

s3: and (3) filtering treatment: adding modified adsorption fibers into the aquaculture wastewater treated in the step S2, simultaneously performing pulse electro-flotation treatment on the aquaculture wastewater for 8-10 h, and then filtering the aquaculture wastewater subjected to pulse electro-flotation treatment;

s4: adsorption treatment: and (4) pumping the aquaculture wastewater filtered in the step S3 into an adsorption tank, ionizing the aquaculture wastewater by using a high-frequency discharge plasma generator in the adsorption tank, spraying the aquaculture wastewater filtered in the step S3 into the adsorption tank through a centrifugal ejector, and opening an ozone generator for oxidation digestion to treat the aquaculture wastewater for 8-10 hours.

Further, when the pulse aeration treatment is carried out in the step S2, the pulse period is 5-10 min, the culture wastewater in the decomposition pond is continuously circulated and atomized, the oxygen transfer driving force can be improved, the oxygen utilization rate is high, and organic matters in the culture wastewater are oxidized and decomposed.

Further, the modified adsorbent fiber in step S3 is prepared by the following steps: placing the polytetrafluoroethylene nanofiber matrix in a high-voltage electrostatic environment for pretreatment; then putting the pretreated polytetrafluoroethylene sodium fiber matrix into a methacrylic acid monomer aqueous solution with the volume percentage of 10-25%, and heating to 30-45 ℃ by using microwaves; then adding the heated solution into an ethylene glycol solvent according to the volume ratio of 1:5, and adding 0.1-2.0% by mass of copper naphthenate to obtain a mixed solution; then placing the mixed solution in an ultrasonic reactor, wherein the ultrasonic frequency is 500W, introducing dry mixed gas with the low temperature of 3-6 ℃, and adding an initiator; finally, mixing the modified adsorbent fiber with tartaric acid according to the mass ratio of 1:20, and stirring the mixture under the action of a magnetic field to obtain modified adsorbent fiber; wherein, the mixed gas is argon and nitrogen mixed according to the volume ratio of 1:1.2, and can adsorb heavy metal and fine impurities in the aquaculture wastewater, and the removal rate is high.

Further, before pretreatment, the polytetrafluoroethylene sodium nanofiber is soaked in hydrochloric acid with the pH value of 5.5-6 for 8-13 min, then the temperature is raised to 50-60 ℃ by water bath heating, the specific surface area is increased, and the preparation stability is high.

The device for the integrated control combined treatment process of the aquaculture wastewater mainly comprises a filter tank, an adjusting tank, a decomposition tank, a pulse electric floating tank, an adsorption tank, a water suction pump and a PLC (programmable logic controller); the water suction pumps comprise a first water suction pump, a second water suction pump, a third water suction pump, a fourth water suction pump and a fifth water suction pump; a filtering screen is arranged in the filtering tank and used for filtering large solid wastes; the adjusting tank is communicated with the filtering tank through the first water inlet pump, a feeding tank is arranged above the adjusting tank, ultrasonic probes are distributed at the bottom of the adjusting tank at equal intervals and connected with an external ultrasonic generator, and a separator is arranged inside the adjusting tank and used for performing solid-liquid separation on suspended matters in the breeding wastewater; the decomposing tank is communicated with a filter screen for carrying out adsorption treatment on the aquaculture wastewater treated by the regulating tank, the filter screen is communicated with the regulating tank through the water pump II, the decomposing tank comprises a frame body, a regulating sieve, a uniform atomizer and a stirrer, a water inlet is arranged above the frame body, a water outlet is arranged at the bottom of the frame body, the regulating sieve is positioned inside the frame body, the uniform atomizer is communicated with the water inlet, the stirrer is positioned below the regulating sieve, pulse aeration heads are uniformly distributed at the bottom of the frame body, an air pressure sensor is arranged inside the frame body, a circulating pipeline is arranged outside the frame body, a water pump III is arranged on the circulating pipeline and used for carrying out atomization circulation on the aquaculture wastewater of the decomposing tank, the upper end of the circulating pipeline is communicated with the uniform atomizer, and the lower end of the circulating pipeline is communicated with the bottom of the decomposing tank; the utility model discloses a high-frequency discharge plasma emitter and ozone generator, including suction pump, pulse electricity floating pond, adsorption pond, PLC controller, filtering ponds, regulating pond, decomposition pond, pulse electricity floating pond, adsorption pond, suction pump, PLC controller and suction pump, decomposition pond, pulse electricity floating pond internal portion are equipped with the electrode, and pulse electricity floating pond internal portion is equipped with the filter residue ware, the filter residue ware is used for getting rid of the heavy metal or the tiny impurity of breeding waste water, the adsorption pond passes through five and pulse electricity floating pond intercommunication of suction pump, and the adsorption pond outer wall is equipped with the slide rail, the symmetry is equipped with the magnet that the magnetic pole is opposite on the slide rail, be equipped with the slider on the magnet, magnet passes through slide rail, slider with the adsorption pond and is connected, the inside high-frequency discharge plasma emitter and the ozone generator that is equipped with of adsorption pond, the electrode of high-frequency discharge plasma emitter is symmetry from top to bottom, the PLC controller with filtering ponds, regulating pond, decomposition pond, pulse electricity floating pond, adsorption pond, suction pump, PLC controller electric connection.

Further, pulse electricity floats pond middle part and is equipped with the reciprocating sieve, the electrode is equipped with many pairs, is head and the tail crisscross distribution, reduces power consumption, and the increase electrode is to the area of contact of breeding waste water, increases the bubble utilization ratio in the pulse electricity floats the pond.

Furthermore, the filtering material used by the filter screen consists of 8-13 parts of coconut shell carbon, 20-25 parts of calcium bentonite, 4-5 parts of silicate, 2-6 parts of polystyrene and 1-5 parts of activated clay by weight, and the emulsified oil and soluble COD substances in the aquaculture wastewater are further adsorbed and removed.

Further, the frame body bottom symmetry is equipped with the slant piece, pulse aeration head 35 is located on the slant piece, the stirring leaf fan of agitator is the staggered distribution for to the even stirring of aerated breed waste water handle, the agitator stirs breed waste water, can more efficient improvement oxygen utilization ratio, can obtain better denitrogenation effect.

Further, the preparation method of the filter material comprises the following steps: mixing coconut shell carbon, calcium bentonite and activated clay according to the proportion, and crushing at the temperature of 50-60 ℃; then, under the conditions that the pressure is 0.1-0.3 MPa and the stirring speed is 150-200 r/min, soaking the mixture into an alkaline solution with the pH value of 7.1-8.2, stirring the mixture, and taking out the mixture for 3-6 min; drying at the temperature of 30-35 ℃; and then mixing the dried coconut shell carbon, calcium bentonite and activated clay with silicate and polystyrene, heating to 210-260 ℃ under the protection of nitrogen, sintering, raising the temperature to 280-300 ℃, treating for 30-40 min, standing and blowing to obtain the filtering material, wherein the removing rate is high, the safety is high, the adsorption specific surface area is large, and the adaptability is strong.

The invention has the beneficial effects that:

1) the treatment process is safe, non-toxic, free of residue, free of secondary pollution, good in effect, wide in applicability and capable of enabling the treated breeding wastewater to reach the discharge standard;

2) according to the invention, the aquaculture wastewater is pretreated, so that solid waste in the aquaculture wastewater can be removed, and through pulse aeration in oxidation treatment and continuous atomization circulation of the aquaculture wastewater, the oxygen transfer driving force can be improved, the oxygen utilization rate is high, organic matters in the aquaculture wastewater are oxidized and decomposed, and the decomposition, decomposition and removal rate of the organic matters is improved by combining filtration of a filter membrane filter;

3) according to the invention, the modified adsorption fibers are added and pulse electro-flotation treatment is carried out, so that impurities in the culture wastewater are further separated and the heavy metal pollution is reduced, the solid-liquid separation process is realized, and the modified adsorption fibers are convenient to recycle;

4) according to the invention, the peculiar smell of the aquaculture wastewater can be eliminated by adsorbing the aquaculture wastewater, so that the peculiar smell is oxidized and digested, the effluent has no obvious peculiar smell, and the treated wastewater can reach the emission standard.

Drawings

FIG. 1 is a schematic structural view of a treatment apparatus for treating aquaculture wastewater according to the present invention;

FIG. 2 is a schematic structural diagram of a decomposition tank according to the present invention;

FIG. 3 is a schematic structural diagram of a pulse electric floating pool;

the device comprises a filter tank 1, a regulating tank 2, a feeding tank 21, an ultrasonic probe 22, a decomposition tank 3, a frame 31, a regulating sieve 32, a uniform atomizer 33, a stirrer 34, a pulse aeration head 35, a circulating pipeline 36, a pulse electric floating tank 4, an electrode 41, a residue filter 42, an adsorption tank 5, a high-frequency discharge plasma generator 51, an ozone generator 52, a PLC 6, a water pump I71, a water pump II 72, a water pump III 73, a water pump III 74, a water pump IV 75, a water pump V8 and a filter 8.

Detailed Description

Example 1

An integrated control aquaculture wastewater combined treatment process comprises the following steps:

s1: pretreatment: roughly filtering the aquaculture wastewater through a filtering tank, pumping the aquaculture wastewater into an adjusting tank, adjusting the pH value of the aquaculture wastewater to be 6, adding a flocculating agent according to 0.1% of the inlet water mass, then adding the flocculating agent according to 0.1% of the inlet water mass, standing, performing solid-liquid separation, and taking supernate; wherein, ultrasonic treatment with ultrasonic frequency of 100kHz is carried out 10min before the flocculant is added, and the ultrasonic treatment is stopped 5min after the flocculation is finished;

s2: oxidation treatment: adjusting the pH value of the supernatant obtained in the step S1 to 3, pumping the supernatant into a decomposition tank, performing pulse aeration treatment with a pulse period of 5min, maintaining the gas circulation in the decomposition tank, and controlling the oxygen partial pressure in the decomposition tank to be 0.2 MPa; meanwhile, the circulating pipeline continuously atomizes and circulates the culture wastewater for 2 hours, and then the culture wastewater is filtered by a filter membrane filter after the treatment;

s3: and (3) filtering treatment: before pretreatment, the polytetrafluoroethylene sodium nanofiber is soaked in hydrochloric acid with the pH value of 5.5 for 8min, then the temperature is raised to 50 ℃ by utilizing water bath heating, finally deionized water is used for cleaning for 1 time, and then the polytetrafluoroethylene sodium nanofiber substrate is pretreated in a high-voltage electrostatic environment; then putting the pretreated polytetrafluoroethylene sodium fiber matrix into 10 volume percent methacrylic acid monomer aqueous solution, and heating to 30 ℃ by using microwaves; then adding the heated solution into an ethylene glycol solvent according to the volume ratio of 1:5, and adding 0.1% by mass of copper naphthenate to obtain a mixed solution; then placing the mixed solution in an ultrasonic reactor, wherein the ultrasonic wave is 500W, introducing dry mixed gas with the low temperature of 3 ℃, and adding 0.08g of ammonium persulfate initiator; finally, mixing the modified adsorbent fiber with tartaric acid according to the mass ratio of 1:20, and stirring the mixture under the action of a magnetic field to obtain modified adsorbent fiber; mixing argon and nitrogen according to a volume ratio of 1:1.2, finally adding modified adsorption fibers into the aquaculture wastewater treated in the step S2, simultaneously performing pulse electro-flotation treatment on the aquaculture wastewater for 8 hours, and then filtering the aquaculture wastewater subjected to pulse electro-flotation treatment;

s4: adsorption treatment: and (4) pumping the aquaculture wastewater filtered in the step S3 into an adsorption tank, ionizing the aquaculture wastewater by using a high-frequency discharge plasma generator in the adsorption tank, spraying the aquaculture wastewater filtered in the step S3 into the adsorption tank through a centrifugal ejector, and turning on an ozone generator for oxidation digestion for 8 hours.

The device for the integrated control combined treatment process of the aquaculture wastewater mainly comprises a filtering tank 1, an adjusting tank 2, a decomposing tank 3, a pulse electric floating tank 4, an adsorption tank 5, a water pump and a PLC (programmable logic controller) 6; the water pumps comprise a first water pump 71, a second water pump 72, a third water pump 73, a fourth water pump 74 and a fifth water pump 75; a filtering screen is arranged in the filtering tank 1 and is used for filtering large solid wastes; the adjusting tank 2 is communicated with the filtering tank 1 through a water inlet pump I71, a feeding tank 21 is arranged above the adjusting tank 2, ultrasonic probes 22 are distributed at the bottom of the adjusting tank 2 at equal intervals, the ultrasonic probes 22 are connected with an external ultrasonic generator, and a separator is arranged inside the adjusting tank 2 and used for carrying out solid-liquid separation on suspended matters in the cultivation wastewater; the decomposing pool 3 is communicated with a filter screen 8 and used for carrying out adsorption treatment on the aquaculture wastewater treated by the adjusting pool 2, the filter screen 8 is communicated with the adjusting pool 2 through a water pump II 72, the decomposing pool 3 comprises a frame body 31, an adjusting screen 32, a uniform atomizer 33 and a stirrer 34, a water inlet is arranged above the frame body 31, a water outlet is arranged at the bottom of the frame body 31, the adjusting screen 32 is positioned inside the frame body 1, the uniform atomizer 33 is communicated with the water inlet, the stirrer 34 is positioned below the adjusting screen, pulse aeration heads 35 are uniformly distributed at the bottom of the frame body 31, inclined blocks are symmetrically arranged at the bottom of the frame body 31, the pulse aeration heads 35 are arranged on the inclined blocks, stirring blades of the stirrer 34 are distributed in a staggered manner and used for carrying out uniform stirring treatment on the aerated aquaculture wastewater, an air pressure sensor is arranged inside the frame body 31, a circulating pipeline 36 is arranged outside the frame body 31, and a water, the device is used for atomizing and circulating the culture wastewater in the decomposition pool 3, the upper end of a circulating pipeline 34 is communicated with a uniform atomizer 33, and the lower end of the circulating pipeline 34 is communicated with the bottom of the decomposition pool 3; the pulse electric floating pool 4 is communicated with the decomposition pool 3 through a water pump four 74, an electrode 41 is arranged in the pulse electric floating pool 4, a vibrating screen is arranged in the middle of the pulse electric floating pool 4, a plurality of pairs of electrodes 41 are arranged and distributed in a head-to-tail staggered manner, a residue filter 42 is arranged in the pulse electric floating pool 4, the residue filter 42 is used for removing heavy metals or fine impurities in the aquaculture wastewater, an adsorption pool 5 is communicated with the pulse electric floating pool 4 through a water pump five 75, a slide rail is arranged on the outer wall of the adsorption pool 5, magnets with opposite magnetic poles are symmetrically arranged on the slide rail, a slide block is arranged on the magnets, the magnets are connected with the adsorption pool through the slide rail and the slide block, a high-frequency discharge plasma emitter 51 and an ozone generator 52 are arranged in the adsorption pool 5, the electrodes of the high-frequency discharge plasma emitter 51 are vertically symmetrical, the electrodes are discharged by the electrodes, the ozone generators 52 on two sides release ozone, and under the action of a rotating magnetic field, under the ionization and the physical action, make the peculiar smell break away from and breed waste water, guarantee that it is better to breed waste water purification efficiency, PLC controller and filtering ponds 1, equalizing basin 2, decomposition tank 3, pulse electricity float pond 4, adsorption tank 5, suction pump, 6 electric connection of PLC controller.

Wherein, the filtering material used by the filter 8 consists of 13 parts of coconut shell carbon, 25 parts of calcium bentonite, 5 parts of silicate, 6 parts of polystyrene and 5 parts of activated clay by weight, and the preparation method comprises the following steps: mixing coconut shell carbon, calcium bentonite and activated clay according to the proportion, and crushing at the temperature of 60 ℃; then immersing the mixture into alkaline solution with pH8.2 under the conditions that the pressure is 0.3MPa and the stirring speed is 200r/min, stirring, and taking out after 6 min; drying at 35 deg.C; and then mixing the dried coconut shell carbon, calcium bentonite and activated clay with silicate and polystyrene, heating to 260 ℃ under the protection of nitrogen, sintering, raising the temperature to 300 ℃, treating for 40min, standing and blowing to obtain the filter material, wherein the removal rate is high, the safety is high, the adsorption specific surface area is large, and the adaptability is strong.

The device and the method are used for treating the change of the water quality parameters of the sewage: before water enters: 90-100mg/L of COD, 545-60 mg/L of BOD, 25-45mg/L of SS, 50-65mg/L of ammonia nitrogen content and 20-23mg/L of TP; after water is discharged: 30-35mg/L of COD, 510-15 mg/L of BOD, 2.1-3.5mg/L of SS, 10-13mg/L of ammonia nitrogen content, 5-6mg/L of TP and 92% of color removal rate.

Example 2

Different from the embodiment 1, the integrated control aquaculture wastewater combined treatment process comprises the following steps:

s1: pretreatment: roughly filtering the aquaculture wastewater through a filtering tank, pumping the aquaculture wastewater into an adjusting tank, adjusting the pH value of the aquaculture wastewater to be 6.5, adding a flocculating agent according to 0.2% of the inlet water mass, then adding the flocculating agent according to 0.2% of the inlet water mass, standing, performing solid-liquid separation, and taking supernatant; wherein, ultrasonic treatment with ultrasonic frequency of 100kHz is carried out 10min before the flocculant is added, and the ultrasonic treatment is stopped 5min after the flocculation is finished;

s2: oxidation treatment: adjusting the pH value of the supernatant obtained in the step S1 to 3.5, pumping the supernatant into a decomposition tank, performing pulse aeration treatment, keeping the gas circulation in the decomposition tank for 8min, and controlling the oxygen partial pressure in the decomposition tank to be 1.0 MPa; meanwhile, the circulating pipeline continuously atomizes and circulates the culture wastewater, the culture wastewater is treated for 3 hours, and then the culture wastewater is filtered by a filter membrane filter after the treatment is finished;

s3: and (3) filtering treatment: before pretreatment, the polytetrafluoroethylene sodium nanofiber is soaked in hydrochloric acid with the pH value of 5.8 for 10min, then the temperature is raised to 55 ℃ by utilizing water bath heating, finally deionized water is used for cleaning for 1 time, and then the polytetrafluoroethylene sodium nanofiber substrate is pretreated in a high-voltage electrostatic environment; then putting the pretreated polytetrafluoroethylene sodium fiber matrix into a methacrylic acid monomer aqueous solution with the volume percentage of 20%, and heating to 40 ℃ by utilizing microwave; then adding the heated solution into an ethylene glycol solvent according to the volume ratio of 1:5, and adding 1.0 mass percent of copper naphthenate to obtain a mixed solution; then placing the mixed solution in an ultrasonic reactor, wherein the ultrasonic wave is 500W, introducing dry mixed gas with the low temperature of 5 ℃, and adding 0.08g of ammonium persulfate initiator; finally, mixing the modified adsorbent fiber with tartaric acid according to the mass ratio of 1:20, and stirring the mixture under the action of a magnetic field to obtain modified adsorbent fiber; wherein the mixed gas is argon and nitrogen mixed according to the volume ratio of 1: 1.2. Adding modified adsorption fibers into the aquaculture wastewater treated in the step S2, simultaneously performing pulse electro-flotation treatment on the aquaculture wastewater for 8 hours, and then filtering the aquaculture wastewater subjected to pulse electro-flotation treatment;

s4: adsorption treatment: and (4) pumping the aquaculture wastewater filtered in the step S3 into an adsorption tank, ionizing the aquaculture wastewater by using a high-frequency discharge plasma generator in the adsorption tank, spraying the aquaculture wastewater filtered in the step S3 into the adsorption tank through a centrifugal ejector, and turning on an ozone generator for oxidation digestion to treat the aquaculture wastewater for 9 hours.

The device and the method are used for treating the change of the water quality parameters of the sewage: before water enters: COD 85-95mg/L, BOD 535-40 mg/L, SS 30-45mg/L, ammonia nitrogen content 45-55mg/L, TP 15-23 mg/L; after water is discharged: 15-20mg/L of COD, 58-13 mg/L of BOD, 1.8-2.1mg/L of SS, 8-13mg/L of ammonia nitrogen content, 4-5mg/L of TP and 95% of color removal rate.

Example 3

s1: pretreatment: roughly filtering the aquaculture wastewater through a filtering tank, pumping the aquaculture wastewater into an adjusting tank, adjusting the pH value of the aquaculture wastewater to 7, adding a flocculating agent according to 0.3 percent of the inlet water mass, then adding the flocculating agent according to 0.3 percent of the inlet water mass, standing, performing solid-liquid separation, and taking supernatant; wherein, ultrasonic treatment with ultrasonic frequency of 100kHz is carried out 10min before the flocculant is added, and the ultrasonic treatment is stopped 5min after the flocculation is finished;

s2: oxidation treatment: adjusting the pH value of the supernatant obtained in the step S1 to 4, pumping the supernatant into a decomposition tank, performing pulse aeration treatment with a pulse period of 10min, maintaining the gas circulation in the decomposition tank, and controlling the oxygen partial pressure in the decomposition tank to be 1.5 MPa; meanwhile, the circulating pipeline continuously atomizes and circulates the aquaculture wastewater, the aquaculture wastewater is treated for 4 hours, and then the aquaculture wastewater is filtered by a filter membrane filter after the treatment is finished;

s3: and (3) filtering treatment: before pretreatment, the polytetrafluoroethylene sodium nanofiber is soaked in hydrochloric acid with the pH value of 6 for 13min, then the temperature is raised to 60 ℃ by utilizing water bath heating, finally the polytetrafluoroethylene sodium nanofiber is washed for 2 times by using deionized water, and then the polytetrafluoroethylene sodium nanofiber substrate is pretreated in a high-voltage electrostatic environment; then putting the pretreated polytetrafluoroethylene sodium fiber matrix into 25 volume percent methacrylic acid monomer aqueous solution, and heating to 45 ℃ by utilizing microwave; then adding the heated solution into an ethylene glycol solvent according to the volume ratio of 1:5, and adding 2.0 mass percent of copper naphthenate to obtain a mixed solution; then placing the mixed solution in an ultrasonic reactor, wherein the ultrasonic wave is 500W, introducing dry mixed gas with the low temperature of 6 ℃, and adding 0.08g of ammonium persulfate initiator; finally, mixing the modified adsorbent fiber with tartaric acid according to the mass ratio of 1:20, and stirring the mixture under the action of a magnetic field to obtain modified adsorbent fiber; mixing argon and nitrogen according to a volume ratio of 1:1.2, finally adding modified adsorption fibers into the aquaculture wastewater treated in the step S2, simultaneously performing pulse electro-flotation treatment on the aquaculture wastewater for 8 hours, and then filtering the aquaculture wastewater subjected to pulse electro-flotation treatment;

s4: adsorption treatment: pumping the aquaculture wastewater filtered in the step S3 into an adsorption tank, ionizing the aquaculture wastewater by using a high-frequency discharge plasma generator in the adsorption tank, spraying the aquaculture wastewater filtered in the step S3 into the adsorption tank through a centrifugal ejector, and turning on an ozone generator for oxidation digestion for 10 hours.

The device and the method are used for treating the change of the water quality parameters of the sewage: before water enters: 95-110mg/L of COD, 555-70 mg/L of BOD, 20-30mg/L of SS, 45-55mg/L of ammonia nitrogen content and 10-15mg/L of TP; after water is discharged: 10-13mg/L of COD, 53-6 mg/L of BOD, 1.6-2.3mg/L of SS, 6-8mg/L of ammonia nitrogen content, 4-6mg/L of TP and 98% of color removal rate.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An integrated control aquaculture wastewater combined treatment process is characterized by comprising the following steps:

s4: adsorption treatment: pumping the culture wastewater filtered in the step S3 into an adsorption tank, ionizing the culture wastewater by using a high-frequency discharge plasma generator in the adsorption tank, spraying the culture wastewater filtered in the step S3 into the adsorption tank through a centrifugal ejector, and opening an ozone generator for oxidation digestion to treat the culture wastewater for 8-10 hours;

the modified adsorption fiber in the step S3 is prepared by the following steps: placing the polytetrafluoroethylene nanofiber matrix in a high-voltage electrostatic environment for pretreatment; then putting the pretreated polytetrafluoroethylene sodium fiber matrix into a methacrylic acid monomer aqueous solution with the volume percentage of 10-25%, and heating to 30-45 ℃ by using microwaves; then adding the heated solution into an ethylene glycol solvent according to the volume ratio of 1:5, and adding 0.1-2.0% by mass of copper naphthenate to obtain a mixed solution; then placing the mixed solution in an ultrasonic reactor, introducing dry mixed gas with the low temperature of 3-6 ℃, and adding an initiator; finally, mixing the modified adsorbent fiber with tartaric acid according to the mass ratio of 1:20, and stirring the mixture under the action of a magnetic field to obtain modified adsorbent fiber; wherein the mixed gas is argon and nitrogen mixed according to the volume ratio of 1: 1.2.

Before pretreatment, soaking the polytetrafluoroethylene sodium nanofiber in hydrochloric acid with the pH of 5.5-6 for 8-13 min, heating the polytetrafluoroethylene sodium nanofiber in a water bath to raise the temperature to 50-60 ℃, and finally washing the polytetrafluoroethylene sodium nanofiber with deionized water for 1-2 times;

the device for the integrated control combined treatment process of the aquaculture wastewater mainly comprises a filtering tank (1), an adjusting tank (2), a decomposing tank (3), a pulse electric floating tank (4), an adsorption tank (5), a water pump and a PLC (programmable logic controller) (6); the water pumps comprise a first water pump (71), a second water pump (72), a third water pump (73), a fourth water pump (74) and a fifth water pump (75); a filtering screen is arranged in the filtering tank (1); the adjusting tank (2) is communicated with the filtering tank (1) through the water inlet pump I (71), a feeding tank (21) is arranged above the adjusting tank (2), ultrasonic probes (22) are distributed at the bottom of the adjusting tank (2) in an equal distance mode, the ultrasonic probes (22) are connected with an external ultrasonic generator, a separator is arranged inside the adjusting tank (2), the decomposing tank (3) is communicated with a filter screen (8), the filter screen (8) is communicated with the adjusting tank (2) through the water suction pump II (72), the decomposing tank (3) comprises a frame body (31), an adjusting screen (32), an even atomizer (33) and a stirrer (34), a water inlet is arranged above the frame body (31), a water outlet is arranged at the bottom of the frame body (31), the adjusting screen (32) is arranged inside the frame body (1), the even atomizer (33) is communicated with the water inlet, and the stirrer (34) is arranged below the adjusting screen, pulse aeration heads (35) are uniformly distributed at the bottom of the frame body (31), an air pressure sensor is arranged in the frame body (31), a circulating pipeline (34) is arranged outside the frame body (31), a water suction pump III (73) is arranged on the circulating pipeline (36), the upper end of the circulating pipeline (34) is communicated with the uniform atomizer (33), and the lower end of the circulating pipeline (34) is communicated with the bottom of the decomposition tank (3); pulse electricity floats pond (4) and passes through four (74) and decomposition pond (3) intercommunications of suction pump, pulse electricity floats pond (4) inside and is equipped with electrode (41), and pulse electricity floats pond (4) inside filter residue ware (42) of being equipped with, filter residue ware (42) are used for getting rid of the heavy metal or tiny impurity of breeding waste water, adsorption tank (5) are passed through five (75) and pulse electricity of suction pump float pond (4) intercommunication, and adsorption tank (5) outer wall is equipped with the slide rail, the symmetry is equipped with the magnet that the magnetic pole is opposite on the slide rail, be equipped with the slider on the magnet, magnet passes through slide rail, slider with the adsorption tank and is connected, and adsorption tank (5) inside is equipped with high frequency discharge plasma emitter (51) and ozone generator (52), the PLC controller with filtering ponds (1), equalizing basin (2), decomposition pond (3), pulse electricity float pond (4), adsorption tank (5), The water pump is electrically connected with the PLC (6);

the middle part of the pulse electric floating pool (4) is provided with a vibrating screen, and a plurality of pairs of electrodes are arranged and distributed in a head-to-tail staggered manner;

the filtering material used by the filtering mesh screen (8) consists of 8-13 parts by weight of coconut shell carbon, 20-25 parts by weight of calcium bentonite, 4-5 parts by weight of silicate, 2-6 parts by weight of polystyrene and 1-5 parts by weight of activated clay;

slant blocks are symmetrically arranged at the bottom of the frame body (31), the pulse aeration heads (35) are arranged on the slant blocks, and stirring blades and fans of the stirrer (34) are distributed in a staggered manner and are used for uniformly stirring and treating the aerated aquaculture wastewater.

2. The integrated control aquaculture wastewater combined treatment process according to claim 1, wherein the pulse period in the step S2 is 5-10 min.

3. The device for the combined treatment of the integrally controlled aquaculture wastewater as claimed in claim 1, wherein the filtering material used by the filtering mesh screen (8) comprises 8-13 parts by weight of coconut shell charcoal, 20-25 parts by weight of calcium bentonite and 1-5 parts by weight of activated clay.