CN112624519A - Treatment method of preserved szechuan pickle wastewater - Google Patents
Treatment method of preserved szechuan pickle wastewater Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/30—Organic compounds
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02F2209/14—NH3-N
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Abstract
A treatment method of preserved szechuan pickle waste water comprises the following steps: 1) filtering the high-salt preserved szechuan pickle wastewater by a solid-liquid separation unit, and adjusting the pH value of the waste liquid to 6.5-8 by the waste liquid entering an adjusting unit; 2) the waste liquid enters a circulating reaction tank to remove organic matters, ammonia nitrogen, total nitrogen and total phosphorus in the waste liquid; 3) effluent circularly treated by the circulating reaction tank enters a coagulating sedimentation unit for precipitating difficult-to-dissolve organic matters and fine particle suspended matters in waste liquid; 4) the effluent treated by the coagulating sedimentation unit enters an electrodialysis treatment unit, and sodium ions and chloride ions of NaCl in the waste liquid are separated by adopting a membrane separation method, so that the salinity of the waste liquid is reduced; 5) and the effluent of the electrodialysis treatment unit enters an anaerobic digestion treatment unit, so that the anaerobic microorganism composite strain added in the waste liquid is fully contacted with the waste liquid, and the waste liquid can be discharged. After suspended organic and inorganic particles are removed, the electrodialysis equipment is used for removing more than 90% of salt in the wastewater, and the energy consumption and the cost of wastewater treatment are effectively reduced.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method for treating tuber mustard wastewater.
Background
The preserved szechuan pickle is a semi-dry non-fermented salted vegetable, is prepared by pickling stems with mustard serving as a raw material, is a sidedish very popular by the public in China, and has become an essential variety on dining tables of people. The preserved szechuan pickle wastewater generated by producing the preserved szechuan pickle is wastewater with the characteristics of high salt content, high organic matter concentration, high nitrogen and phosphorus, high osmotic pressure and the like, and has the problems of high treatment difficulty, high treatment cost and the like. Although some regions have developed some special treatment actions for the problem, the state has no relevant wastewater pollutant discharge control standard, and the production and processing enterprises discharge the wastewater after mainly diluting the wastewater. A large amount of discharged tuber mustard waste water becomes a main source of regional pollution, soil hardening and salinization phenomena are caused, and serious ecological harm is brought to local environment.
Chinese patent with the publication number of CN101629153A and the publication date of 2010, 1 and 20 discloses a method for treating tuber mustard wastewater by using halophilic (tolerant) complex flora, which is characterized in that microbial strains which have halophilic characteristics and can decompose organic substances in wastewater and widely exist in natural environment are acclimated aerobically or anaerobically to gradually adapt to high-salt environment, so that the capability of resisting salinity impact and degrading the organic substances in the wastewater aerobically (or anaerobically) is improved. However, when the salinity of the preserved szechuan pickle wastewater is 3.5-5.0%, the method has good removal effect on organic matters and ammonia nitrogen, the added microbial inoculum is easy to run off or degenerate along with the increase of the salinity, the maintenance time of the biological enhancement effect is short, the treatment efficiency is obviously reduced, and the method cannot be suitable for the treatment of the preserved szechuan pickle wastewater.
When the method is used for treating the tuber mustard wastewater, in order to ensure the microbial activity, a large amount of tap water is used for diluting the salinity of 12 percent to the salinity of 1.5 to 2 percent, but the salt is continuously accumulated in a biochemical pond, the growth of the microorganisms is inhibited and even dies, and the stability and the reliability of biochemical treatment equipment are reduced. Therefore, the development of a feasible, stable, economical and efficient preserved szechuan pickle wastewater treatment process is an urgent problem to be solved.
Disclosure of Invention
Aiming at the corresponding defects of the prior art, the invention provides a method for treating tuber mustard wastewater, combines the advantages of two processes of a biological method and an electrodialysis treatment technology, and reduces COD (organic matter) concentration and NH4 +The concentration of N (ammonia nitrogen concentration) is reduced, the concentration of SS (mixed liquid suspended solid concentration) of the preserved szechuan pickle wastewater is reduced, the normal operation of electrodialysis equipment is guaranteed, the salinity of the preserved szechuan pickle wastewater is reduced, the problem of removing organic matters, nitrogen and phosphorus under the high-salt condition is solved by combining an aerobic and anaerobic microorganism composite bacteria system, and the preserved szechuan pickle wastewater can be efficiently treated.
The purpose of the invention is realized by adopting the following scheme: a treatment method of preserved szechuan pickle waste water comprises the following steps:
1) filtering the high-salt preserved szechuan pickle wastewater by a solid-liquid separation unit, allowing the waste liquid to enter an adjusting unit, and adjusting the pH value of the waste liquid to 6.5-8 by using dilute hydrochloric acid or sodium hydroxide solution;
2) step 1) enabling the waste liquid after the pH value is adjusted to enter a circulating reaction tank to carry out water inlet-aeration-sedimentation-drainage circulation, enabling filler attached with halophilic composite bacteria in filler bundles on a suspension bracket of the circulating reaction tank to be fully contacted with the waste liquid, and removing organic matters, ammonia nitrogen, total nitrogen and total phosphorus in the waste liquid;
3) the effluent after the circular treatment of the circular reaction tank enters a coagulating sedimentation unit, and a coagulant aid are respectively added into a coagulating area and a flocculating area of the coagulating sedimentation unit and are used for precipitating refractory organic matters and fine particle suspended matters of the waste liquid until COD and NH in the waste liquid of the coagulating sedimentation unit4 +The concentration of N, SS is 5500-6500 mg/L, 70-100 mg/L and 10-15 mg/L respectively, and the effluent of the coagulating sedimentation unit enters an electrodialysis treatment unit;
4) the effluent treated by the coagulating sedimentation unit enters an electrodialysis treatment unit, sodium ions and chloride ions of NaCl in the waste liquid are separated by adopting a membrane separation method, and the salinity of the waste liquid is reduced until the COD concentration in the waste liquid of the electrodialysis treatment unit reaches 5500-6500 mg/L, NH4 +The concentration of N reaches 10-15 mg/L, SS and 10-15 mg/L, the salinity is 0.1%, and the effluent of the electrodialysis treatment unit enters an anaerobic digestion treatment unit;
5) controlling the temperature of the waste liquid in the anaerobic digestion treatment unit to be 30-38 ℃ and the HRT to be 12-24 h/d, and fully contacting the anaerobic microorganism composite strain added in the waste liquid with the waste liquid until the COD concentration in the effluent of the anaerobic digestion treatment unit is 50-100 mg/L and NH is generated4 +The concentration of N is 10-15 mg/L, the concentration of SS is 10-15 mg/L, the salinity is 0.1%, and the wastewater is discharged.
The filling volume ratio of the filler in the circulating reaction tank is 60-70%.
Each cycle of the circulation of the circulating reaction tank is 6 hours, wherein water is fed for 1 hour, aeration is carried out for 2.5 hours after water is fed, sedimentation is carried out for 1.5 hours, and water is discharged for 1 hour;
preferably, the water inflow entering the circulating reaction tank is adjusted to be 300-900L/h through a water inlet pump and a flow meter, the aeration intensity range is 900-1200L/h, the sludge concentration is 3200-3500 mg/L, and the water discharge ratio is 1/3.
The halophilic composite microbial inoculum is prepared by compounding Rhodococcus erythropolis C1, Leibetococcus motilis, Pseudomonas aeruginosa, Alcaligenes faecalis and Acinetobacter, wherein the Rhodococcus erythropolis C1: motilin lepigone: the bacterium pseudomonas aeruginosa: alcaligenes faecalis: the volume ratio of the acinetobacter is 10-15%: 20-30%: 10-20%: 15-20%: 10 to 20 percent.
The coagulant is polyaluminium chloride, and the coagulant aid is polyacrylamide anion;
preferably, the adding amount of the polyaluminium chloride per ton of water is 200-400 g;
preferably, the dosage of each ton of water of the polyacrylamide anion is 1-2 g.
The stirring time of a coagulation area and a flocculation area of the coagulation and precipitation unit is 25-30 min, the precipitation time is 1-1.2 h, the HRT of a sedimentation tank is 1.4-1.7 h, the addition amount of a coagulant is 60-80 mg/L, and the addition amount of a coagulant aid is 3-5 mg/L.
And 4) controlling the temperature of the waste liquid in the electrodialysis treatment unit in the step 4) within 15-35 ℃, and introducing direct current with the voltage less than 45V.
And 5) before the effluent of the anaerobic digestion treatment unit is discharged, the effluent enters an up-flow anaerobic sludge bed reactor, so that organic matters in the waste liquid are converted into methane, and then the methane is discharged.
The filler in the step 2) is a combined soft filler, the outer ring of the combined soft filler is pressed on the double-ring large plastic ring by fiber filaments with the monofilament diameter of 11-18 mu m, and the distance between each bundle of the filler is phi 100 mm.
And 5) compounding the anaerobic microorganism composite strain by pseudomonas, methanogenic bacteria and propionic acid degrading bacteria, wherein the pseudomonas comprises the following components in parts by weight: methanogenic bacteria: the volume ratio of the propionic acid degrading bacteria is 30-40%: 20-30%: 20-30%.
The invention has the following beneficial effects:
(1) according to the invention, the coagulating sedimentation unit is utilized to remove a large amount of suspended organic and inorganic particles in the preserved szechuan pickle wastewater, so that the problem that the electrodialysis treatment unit is blocked due to overhigh concentration of suspended solid in the mixed liquid of the preserved szechuan pickle wastewater is effectively avoided;
(2) with the help of the coagulating sedimentation unit, the electrodialysis treatment unit normally treats high-salinity wastewater with the salinity of more than 10 percent, and the operation at low voltage can reduce Cl-Salt loss due to electrochemical oxidation.
(3) Due to electroosmosisNa in the precipitation treatment unit+And NH4+Will move towards the cathode, where it will contact OH-Combined production of NH3And NaOH; cl-And PO4 3-Will migrate to the anode and concentrate. Wherein PO4 3-Can be mixed with Ca2+Bound precipitate forms Ca3(PO4)2The residual HCl can be reused in an acid form as a fertilizer, so that the salt content in the waste liquid is greatly reduced, and the normal growth and metabolism of anaerobic fermentation microorganisms in an anaerobic digestion treatment unit are ensured;
(4) when the anaerobic digestion treatment unit is coupled with the electrodialysis treatment unit, organic substances in the effluent water of the electrodialysis treatment unit are used as a carbon source of the anaerobic digestion treatment unit;
(5) the method can effectively recover NaCl in the preserved szechuan pickle wastewater and perform energy conversion under the condition of less energy consumption, and can simultaneously remove N and P in the wastewater, thereby realizing zero emission of the wastewater.
In conclusion, the suspended organic matter and inorganic matter particles in the preserved szechuan pickle wastewater are removed, after the problem that an electrodialysis device cannot normally work for a long time is solved, the electrodialysis device is used for separating charged particles in a solution under the action of concentration difference and potential difference, one side of a membrane is enriched and concentrated, more than 90% of salt in the wastewater is removed, inorganic ions are recycled in an acid form, and even the organic matter in the wastewater can be converted into methane through an up-flow anaerobic sludge bed reactor, so that the resource utilization of waste is realized, the energy consumption and cost of wastewater treatment are effectively reduced, the treatment time of high-salt preserved szechuan pickle wastewater is shortened, the pollutant load of each treatment unit can be reduced to the maximum extent, the wastewater treatment difficulty is reduced, and the resource utilization and the stable standard discharge of the wastewater are finally realized.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view of a wastewater treatment system according to an embodiment.
Detailed Description
As shown in fig. 1 to 2, a method for treating tuber mustard wastewater comprises the following steps:
1) filtering the high-salt preserved szechuan pickle wastewater by a solid-liquid separation unit, allowing the waste liquid to enter an adjusting unit, and adjusting the pH value of the waste liquid to 6.5-8 by using dilute hydrochloric acid or sodium hydroxide solution;
2) step 1) enabling the waste liquid after the pH value is adjusted to enter a circulating reaction tank to carry out water inlet-aeration-sedimentation-drainage circulation, enabling filler attached with halophilic composite bacteria in filler bundles on a suspension bracket of the circulating reaction tank to be fully contacted with the waste liquid, and removing organic matters, ammonia nitrogen, total nitrogen and total phosphorus in the waste liquid;
the halophilic composite microbial inoculum is prepared by compounding Rhodococcus erythropolis C1, Leibetococcus motilis, Pseudomonas aeruginosa, Alcaligenes faecalis and Acinetobacter, wherein the Rhodococcus erythropolis C1: motilin lepigone: the bacterium pseudomonas aeruginosa: alcaligenes faecalis: the volume ratio of the acinetobacter is 10-15%: 20-30%: 10-20%: 15-20%: 10 to 20 percent.
The filling volume ratio of the filler in the circulating reaction tank is 60-70%.
The filler in the step 2) is a combined soft filler, the outer ring of the combined soft filler is pressed on the double-ring large plastic ring by fiber filaments with the monofilament diameter of 11-18 mu m, and the distance between each bundle of the filler is phi 100 mm.
Each cycle of the circulation of the circulating reaction tank is 6 hours, wherein water is fed for 1 hour, aeration is carried out for 2.5 hours after water is fed, sedimentation is carried out for 1.5 hours, and water is discharged for 1 hour;
preferably, the water inflow entering the circulating reaction tank is adjusted to be 300-900L/h through a water inlet pump and a flow meter, the aeration intensity range is 900-1200L/h, the sludge concentration is 3200-3500 mg/L, and the water discharge ratio is 1/3.
3) The effluent after the circular treatment of the circular reaction tank enters a coagulating sedimentation unit, and a coagulant aid are respectively added into a coagulating area and a flocculating area of the coagulating sedimentation unit and are used for precipitating refractory organic matters and fine particle suspended matters of the waste liquid until COD and NH in the waste liquid of the coagulating sedimentation unit4 +The concentration of N, SS is 5500-6500 mg/L, 70-100 mg/L and 10-15 mg/L respectively, and the effluent of the coagulating sedimentation unit enters an electrodialysis treatment unit;
the coagulant is polyaluminium chloride, and the coagulant aid is polyacrylamide anion;
preferably, the adding amount of the polyaluminium chloride per ton of water is 200-400 g;
preferably, the dosage of each ton of water of the polyacrylamide anion is 1-2 g.
The stirring time of a coagulation area and a flocculation area of the coagulation and precipitation unit is 25-30 min, the precipitation time is 1-1.2 h, the HRT of a sedimentation tank is 1.4-1.7 h, the addition amount of a coagulant is 60-80 mg/L, and the addition amount of a coagulant aid is 3-5 mg/L.
4) The effluent treated by the coagulating sedimentation unit enters an electrodialysis treatment unit, sodium ions and chloride ions of NaCl in the waste liquid are separated by adopting a membrane separation method, and the salinity of the waste liquid is reduced until the COD concentration in the waste liquid of the electrodialysis treatment unit reaches 5500-6500 mg/L, NH4 +The concentration of N reaches 10-15 mg/L, SS and 10-15 mg/L, the salinity is 0.1%, and the effluent of the electrodialysis treatment unit enters an anaerobic digestion treatment unit;
and 4) controlling the temperature of the waste liquid in the electrodialysis treatment unit in the step 4) within 15-35 ℃, and introducing direct current with the voltage less than 45V.
5) Controlling the temperature of the waste liquid in the anaerobic digestion treatment unit to be 30-38 ℃ and the HRT to be 12-24 h/d, and fully contacting the anaerobic microorganism composite strain added in the waste liquid with the waste liquid until the COD concentration in the effluent of the anaerobic digestion treatment unit is 50-100 mg/L and NH is generated4 +The concentration of N is 10-15 mg/L, the concentration of SS is 10-15 mg/L, the salinity is 0.1%, and the wastewater is discharged.
And 5) before the effluent of the anaerobic digestion treatment unit is discharged, the effluent enters an up-flow anaerobic sludge bed reactor, so that organic matters in the waste liquid are converted into methane, and then the methane is discharged.
And 5) compounding the anaerobic microorganism composite strain by pseudomonas, methanogenic bacteria and propionic acid degrading bacteria, wherein the pseudomonas comprises the following components in parts by weight: methanogenic bacteria: the volume ratio of the propionic acid degrading bacteria is 30-40%: 20-30%: 20-30%.
The high-salt preserved szechuan pickle wastewater treatment system comprises a high-salt preserved szechuan pickle wastewater pretreatment device, an electrodialyzer and a UASB reactor which are sequentially arranged, wherein the high-salt preserved szechuan pickle wastewater pretreatment device comprises an adjusting tank 17, a circulating reaction tank 18, a middle tank 19 and a sedimentation tank 20 which are sequentially arranged, the adjusting tank 17 is connected with a grid 16 arranged at the upstream through a pipeline, a valve and a water pump are arranged on the pipeline, and the grid 16 is used for filtering impurities and suspended matters in wastewater to be treated; the downstream of equalizing basin 17 connects circulation reaction tank 18 through main inlet tube 3, is provided with first suction pump 1 and first check valve 2 on this main inlet tube 3 to and be used for measuring the flowmeter of the flow of intaking, first suction pump 1 is arranged in drawing water from equalizing basin 17, and first check valve 2 is used for preventing the water backward flow that flows through. The circulating reaction tank 18 is internally divided into a biological selection area 18-1, a pre-reaction area 18-2 and a main reaction area 18-3 by partition walls in sequence according to water flow, the partition wall between the biological selection area 18-1 and the pre-reaction area 18-2 is an overflow wall, so that the biological selection area 18-1 enters the pre-reaction area 18-2 through overflow, and the lower part of the partition wall between the pre-reaction area 18-2 and the main reaction area 18-3 is provided with an upper partition wall of a flow through port, so that water in the pre-reaction area 18-2 enters the main reaction area 18-3 through the flow through port. The main reaction zone is internally provided with a plurality of filler hangers 13, a plurality of filler bundles 13a for attaching halophilic complex bacteria agents are arranged on each filler hanger 13 from top to bottom, and the filling volume of the filler bundles accounts for 60-70% of the volume of the main reaction zone. The filler bundle comprises a framework and a fiber bundle attached with the halophilic complex microbial inoculum, the framework is composed of two circular rings and a plurality of radially extending connecting strips for connecting the two circular rings, the fiber bundles are fixed on the framework and extend in a ray shape to form a filler bundle 13a with the diameter of 80 mm-100 mm, and the filler bundle 13a is convenient for the halophilic complex microbial inoculum to be attached to form a hanging film. The biological selection device is characterized in that a first backflow pump 6 is arranged in the main reaction zone 18-3, the downstream end of the first backflow pump 6 is connected with a first backflow pipe 12, the downstream end of the first backflow pipe 12 is inserted into the biological selection zone 18-1 to form a first backflow circulation structure, a flow meter is arranged on the first backflow pipe 12 and used for measuring first backflow flow, and a stirrer 15 driven by a motor is arranged in the biological selection zone. The bottom of the main reaction zone 18-3 is provided with an aeration pipe 5, the aeration pipe 5 is provided with a plurality of microporous aeration heads, and the aeration pipe 5 extends out of the circulating reaction tank 18 and is connected with an aeration pump 9. The main reaction zone 18-3 is connected with the inlet end of a second water pump 24 through a water pumping pipe 23, and a flowmeter and a check valve are arranged on the water pumping pipe 23 and used for measuring the water quantity pumped out of the main reaction zone 18-3. The water pumping pipe 23 is connected with a second return pipe 22, the second return pipe 22 is welded on the water pumping pipe 23 through a tee joint, the water pumping pipe 23 is connected with the main water inlet pipe 3 through the second return pipe 22 to form a second return circulation structure, and the second return pipe 22 is connected with the main water inlet pipe 3 through a tee joint or welding. The second return pipe 22 is provided with a second return pump 25, a second check valve 4, and a flow meter 14, and the flow meter 14 is used for measuring a second return flow rate. The outlet end of the second water pump 24 is connected with the water inlet pipe of the intermediate tank 19, the water outlet pipe of the intermediate tank 19 is connected with the sedimentation tank 20, and the water outlet pipe is provided with a third water pump 26. The sedimentation tank 20 is sequentially divided into a coagulation area 20-1, a flocculation area 20-2 and a sedimentation area 20-3 by partition walls according to a flowing water sequence, the coagulation area 20-1 is communicated with the flocculation area 20-2 through a guide pipe at the lower part, a flocculation guide cylinder 27 is arranged in the flocculation area 20-2, the flocculation guide cylinder 27 is positioned above the lower downstream opening of the guide pipe, stirrers 15 driven by a motor are respectively arranged in the flocculation guide cylinder 27 and the coagulation area 20-1, an overflow channel 28 is formed between the flocculation area 20-2 and the sedimentation area 20-3 by an upper partition wall at the side of the flocculation area and an overflow wall at the side of the sedimentation area to be communicated, and flocculated water overflows into the sedimentation area 20-3 through the overflow channel 28. The upper part of the settling zone 20-3 is provided with a water outlet 21, the bottom of the settling zone 20-3 is provided with a sludge discharge port 20-4, a sludge scraper 29 is arranged above the sludge discharge port 20-4, the sludge scraper 29 is fixedly connected on a rotating shaft driven by a motor, the water outlet of the settling zone is connected with the water inlet of the electrodialyzer through a pipeline, and the water outlet of the electrodialyzer is connected with the water inlet of the UASB reactor through a pipeline.
The treatment steps of the high-salt preserved szechuan pickle wastewater by using the system are as follows, namely, the solid-liquid separation unit is a grid, the adjusting unit is an adjusting tank, the coagulating sedimentation unit is a sedimentation tank, the electrodialysis treatment unit is an electrodialyzer, and the anaerobic digestion treatment unit is an UASB reactor:
1) high-salt preserved szechuan pickle waste water passes through the grid, filters, removes partial suspended substance, eliminates the influence of suspended substance to follow-up processing system. Enabling the waste water filtered by the grids to enter an adjusting tank, and adjusting the pH value of the waste water to 6.5-8 by using dilute hydrochloric acid or NaOH;
2) and (2) enabling the wastewater with the pH value adjusted to enter a circulating reaction tank for water inlet-aeration-precipitation-drainage circulation, wherein each cycle of the circulation is 6 hours, wherein water inlet is 1 hour, aeration is performed for 2.5 hours after water inlet, precipitation is performed for 1.5 hours, and drainage is performed for 1 hour, so that organic matters, ammonia nitrogen, total nitrogen and total phosphorus in the wastewater are continuously removed in the circulation, the water inlet amount entering the circulating reaction tank is adjusted to be 300-900L/h through a water inlet pump and a flow meter, the aeration intensity range is 900-1200L/h, the sludge concentration is 3200-3500 mg/L, and the drainage ratio is 1/3 (the ratio of the water inlet liquid level to the decantation liquid level)/the water inlet liquid level). After the wastewater is treated by a CASS pool reinforced by halophilic compound bacteria, most of pollutants such as COD (chemical oxygen demand), SS (suspended solid) and the like in the wastewater can be removed, and nitrogen-containing pollutants such as ammonia nitrogen and the like are mainly removed by virtue of aerobic nitrification reaction in a main reaction zone;
in the wastewater circulation process, the filler attached with halophilic compound bacteria in the filler bundles on the suspension bracket is fully contacted with the wastewater, and organic matters, ammonia nitrogen, total nitrogen and total phosphorus in the wastewater are removed or reduced; the filling volume ratio of the filler in the main reaction zone of the circulating reaction tank is 60-70%, so that the specific surface area of the filler is large, the oxygen utilization rate is high, the blockage is not easy to occur (the fixed snowflake-shaped branches in the filler bundles can be used for film hanging and can also effectively cut bubbles, the oxygen transfer rate and the oxygen utilization rate are improved), and pollutants in water can be efficiently removed.
The halophilic composite microbial inoculum is prepared by compounding Rhodococcus erythropolis C1, Leibetococcus motilis, Pseudomonas aeruginosa, Alcaligenes faecalis and Acinetobacter, wherein the Rhodococcus erythropolis C1: motilin lepigone: the bacterium pseudomonas aeruginosa: alcaligenes faecalis: the volume ratio of the acinetobacter is 10-15%: 20-30%: 10-20%: 15-20%: 10 to 20 percent
3) And the effluent circularly treated by the circulating reaction tank enters the sedimentation tank after passing through the intermediate tank, wherein the effluent of the circulating reaction tank is regulated by the flowmeter to enter the intermediate tank and then enters the sedimentation tank from the intermediate tank so as to ensure the stable flow of the water flow of the system. Effluent sequentially passes through a coagulation zone, a flocculation zone and a sedimentation zone in a sedimentation tank, and coagulant polyaluminium chloride and coagulant aid polyacrylamide anions are respectively added into the coagulation zone and the flocculation zone of the sedimentation tank and are used for precipitating difficult-to-dissolve organic matters and fine particle suspended matters in wastewater; the coagulant and the flocculating agent are respectively and fully mixed with the pollutants in the wastewater by stirring in the coagulation area and the flocculation area through the stirring rod 15, so that the treatment effect is improved. The stirring time of the coagulation zone and the flocculation zone of the sedimentation tank is 25-30 min, the sedimentation time is 1-1.2 h, and the HRT of the sedimentation tank is 1.4-1.7 h.
COD and NH in the effluent of the sedimentation tank4 +The concentration of the-N, SS reaches 5500-6500 mg/L, 70-100 mg/L and 10-15 mg/L respectively, thus completing the pretreatment of the high-salt tuber mustard wastewater;
4) the effluent of the sedimentation tank enters an electrodialyzer, sodium ions and chloride ions of NaCl in the waste liquid are separated by adopting a membrane separation method, the salinity of the waste liquid is reduced until the COD concentration in the waste liquid of the electrodialyzer reaches 5500-6500 mg/L, NH4 +The concentration of N reaches 10-15 mg/L, SS and the salinity is 0.1%, and effluent of the electrodialyzer enters a UASB reactor;
5) controlling the temperature of the waste liquid in the UASB reactor to be 30-38 ℃ and the HRT to be 12-24 h/d, and fully contacting the anaerobic microorganism composite strain added in the waste liquid with the waste liquid until the COD concentration in the effluent of the UASB reactor is 50-100 mg/L and NH is generated4 +The concentration of N is 10-15 mg/L, the concentration of SS is 10-15 mg/L, the salinity is 0.1%, and the wastewater is discharged.
The invention will be further illustrated with reference to the following examples:
example 1:
the invention is adopted to treat the hot pickled mustard tuber waste water of a certain hot pickled mustard tuber factory in Fuling according to the steps, and COD and NH in the hot pickled mustard tuber waste water4 +The water quality of N and SS is 14380-14410, 441-453 and 218-230 mg/L respectively, and the salinity is 7%;
adjusting the pH value of the solution to 6.5-8.5 in an adjusting tank through a grid, entering a circulating reaction tank for biological enhancement treatment, and carrying out activation treatment (cold storage) on halophilic bacteria (the inoculum size is 5-10%)Performing amplification culture on halophilic compound bacteria seed liquid, adding a culture medium to enable the halophilic compound bacteria seed liquid to grow to the optimal concentration) 3d, setting HRT (high temperature transport) 12h and sequencing batch water change, wherein the water drainage ratio is 1/3, the aeration intensity is 1000L/h, and the sludge concentration is 3200 mb/L; then coagulation, flocculation and sedimentation treatment are carried out, namely the coagulation flocculation retention time is set to be 0.7h, the coagulant addition amount is 70mg/L, the flocculation addition amount is 4mg/L, the removal rate of COD and SS of the preserved szechuan pickle wastewater is about 50 percent and 95 percent, and supernatant COD and NH after sedimentation are carried out4 +N, SS the water quality is 5500-6500 mg/L, 70-100 mg/L, 10-15 mg/L, respectively, enters into electrodialyzer, the liquid inlet temperature of electrodialyzer is controlled at about 20 deg.C, the working voltage is controlled at about 20 deg.C<DC45V, wherein the COD concentration of the effluent finally treated by the electrodialyzer is 5500-6500 mg/L, the ammonia nitrogen concentration is 10-15 mg/L, the SS concentration is 10-15 mg/L, the salinity is 0.1%, and the effluent of the electrodialyzer enters the UASB reactor.
In the UASB reactor, the residual organic matters in the water are further removed by means of the combined action of anaerobic microorganisms and the UASB reactor. The temperature of the waste water is controlled to be about 35 ℃, and the retention time is set to be 39 h. Finally, the COD of the treated effluent is about 98.5mg/L, the ammonia nitrogen is about 11.42mg/L, the SS is about 9.5mg/L, and the salinity is about 0.1 percent, so that the effluent can be discharged.
The indexes of the pollutants in and out of the water and the removal rate results of each unit are shown in table 1.
TABLE 1
Example 2:
after the comprehensive wastewater and the mixed liquor of the pickle preserving wastewater generated in the production process of a certain pickle factory in Banan, Chongqing are treated according to the steps, the mixed liquor sequentially passes through a high-salt pickle wastewater pretreatment device, an electrodialyzer and a UASB reactor, and finally the effluent can meet the discharge standard, and the specific treatment conditions are shown in Table 2.
TABLE 2
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make modifications without departing from the spirit of the present invention.
Claims (10)
1. The treatment method of the preserved szechuan pickle wastewater is characterized by comprising the following steps of:
1) filtering the high-salt preserved szechuan pickle wastewater by a solid-liquid separation unit, allowing the waste liquid to enter an adjusting unit, and adjusting the pH value of the waste liquid to 6.5-8 by using dilute hydrochloric acid or sodium hydroxide solution;
2) step 1) enabling the waste liquid after the pH value is adjusted to enter a circulating reaction tank to carry out water inlet-aeration-sedimentation-drainage circulation, enabling filler attached with halophilic composite bacteria in filler bundles on a suspension bracket of the circulating reaction tank to be fully contacted with the waste liquid, and removing organic matters, ammonia nitrogen, total nitrogen and total phosphorus in the waste liquid;
3) the effluent after the circular treatment of the circular reaction tank enters a coagulating sedimentation unit, and a coagulant aid are respectively added into a coagulating area and a flocculating area of the coagulating sedimentation unit and are used for precipitating refractory organic matters and fine particle suspended matters of the waste liquid until COD and NH in the waste liquid of the coagulating sedimentation unit4 +The concentration of N, SS is 5500-6500 mg/L, 70-100 mg/L and 10-15 mg/L respectively, and the effluent of the coagulating sedimentation unit enters an electrodialysis treatment unit;
4) the effluent treated by the coagulating sedimentation unit enters an electrodialysis treatment unit, sodium ions and chloride ions of NaCl in the waste liquid are separated by adopting a membrane separation method, and the salinity of the waste liquid is reduced until the COD concentration in the waste liquid of the electrodialysis treatment unit reaches 5500-6500 mg/L, NH4 +The concentration of N reaches 10-15 mg/L, SS and 10-15 mg/L, the salinity is 0.1%, and the effluent of the electrodialysis treatment unit enters an anaerobic digestion treatment unit;
5) controlling the temperature of the waste liquid in the anaerobic digestion treatment unit to be 30-38 ℃ and the HRT (Rockwell temperature) to be 12-24 h/d, and enabling the anaerobic microorganism composite strain added in the waste liquid to fully contact with the waste liquid until the waste liquid is heated to a temperature of 30-38 DEG CThe COD concentration in the effluent of the anaerobic digestion treatment unit is 50-100 mg/L, NH4 +The concentration of N is 10-15 mg/L, the concentration of SS is 10-15 mg/L, the salinity is 0.1%, and the wastewater is discharged.
2. The method of claim 1, wherein: the filling volume ratio of the filler in the circulating reaction tank is 60-70%.
3. The method of claim 1, wherein: each cycle of the circulation of the circulating reaction tank is 6 hours, wherein water is fed for 1 hour, aeration is carried out for 2.5 hours after water is fed, sedimentation is carried out for 1.5 hours, and water is discharged for 1 hour;
preferably, the water inflow entering the circulating reaction tank is adjusted to be 300-900L/h through a water inlet pump and a flow meter, the aeration intensity range is 900-1200L/h, the sludge concentration is 3200-3500 mg/L, and the water discharge ratio is 1/3.
4. The method of claim 1, wherein: the halophilic composite microbial inoculum is prepared by compounding Rhodococcus erythropolis C1, Leibetococcus motilis, Pseudomonas aeruginosa, Alcaligenes faecalis and Acinetobacter, wherein the Rhodococcus erythropolis C1: motilin lepigone: the bacterium pseudomonas aeruginosa: alcaligenes faecalis: the volume ratio of the acinetobacter is 10-15%: 20-30%: 10-20%: 15-20%: 10 to 20 percent.
5. The method of claim 1, wherein: the coagulant is polyaluminium chloride, and the coagulant aid is polyacrylamide anion;
preferably, the adding amount of the polyaluminium chloride per ton of water is 200-400 g;
preferably, the dosage of each ton of water of the polyacrylamide anion is 1-2 g.
6. The method of claim 1, wherein: the stirring time of a coagulation area and a flocculation area of the coagulation and precipitation unit is 25-30 min, the precipitation time is 1-1.2 h, the HRT of a sedimentation tank is 1.4-1.7 h, the addition amount of a coagulant is 60-80 mg/L, and the addition amount of a coagulant aid is 3-5 mg/L.
7. The method of claim 1, wherein: and 4) controlling the temperature of the waste liquid in the electrodialysis treatment unit in the step 4) within 15-35 ℃, and introducing direct current with the voltage less than 45V.
8. The method of claim 1, wherein: and 5) before the effluent of the anaerobic digestion treatment unit is discharged, the effluent enters an up-flow anaerobic sludge bed reactor, so that organic matters in the waste liquid are converted into methane, and then the methane is discharged.
9. The method of claim 1, wherein: the filler in the step 2) is a combined soft filler, the outer ring of the combined soft filler is pressed on the double-ring large plastic ring by fiber filaments with the monofilament diameter of 11-18 mu m, and the distance between each bundle of the filler is phi 100 mm.
10. The method of claim 1, wherein: and 5) compounding the anaerobic microorganism composite strain by pseudomonas, methanogenic bacteria and propionic acid degrading bacteria, wherein the pseudomonas comprises the following components in parts by weight: methanogenic bacteria: the volume ratio of the propionic acid degrading bacteria is 30-40%: 20-30%: 20-30%.
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