CN110590074A - High-concentration pickle wastewater treatment process - Google Patents
High-concentration pickle wastewater treatment process Download PDFInfo
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- CN110590074A CN110590074A CN201910959175.8A CN201910959175A CN110590074A CN 110590074 A CN110590074 A CN 110590074A CN 201910959175 A CN201910959175 A CN 201910959175A CN 110590074 A CN110590074 A CN 110590074A
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- 235000021110 pickles Nutrition 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 11
- 239000002351 wastewater Substances 0.000 claims abstract description 49
- 150000003839 salts Chemical class 0.000 claims abstract description 48
- 239000012452 mother liquor Substances 0.000 claims abstract description 21
- 238000001704 evaporation Methods 0.000 claims abstract description 20
- 230000008020 evaporation Effects 0.000 claims abstract description 19
- 239000013505 freshwater Substances 0.000 claims abstract description 17
- 238000000909 electrodialysis Methods 0.000 claims abstract description 16
- 238000002425 crystallisation Methods 0.000 claims abstract description 15
- 230000008025 crystallization Effects 0.000 claims abstract description 15
- 239000012266 salt solution Substances 0.000 claims abstract description 12
- 239000010413 mother solution Substances 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000013078 crystal Substances 0.000 claims description 8
- 238000005868 electrolysis reaction Methods 0.000 claims description 5
- 235000021109 kimchi Nutrition 0.000 claims 8
- 239000000356 contaminant Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 29
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 16
- 239000010802 sludge Substances 0.000 description 12
- 239000000126 substance Substances 0.000 description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 238000004062 sedimentation Methods 0.000 description 8
- 238000012946 outsourcing Methods 0.000 description 7
- 238000005086 pumping Methods 0.000 description 7
- 238000004659 sterilization and disinfection Methods 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000010979 pH adjustment Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
Classifications
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
-
- 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
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- 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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
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- C02F2101/30—Organic compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention discloses a high-concentration pickle wastewater treatment process. The process comprises the following steps: (1) adjusting the pH value of the pretreated pickle wastewater to be alkaline, separating by electrodialysis to obtain a salt solution and COD fresh water, and performing biochemical treatment on the COD fresh water; (2) after MVR evaporation crystallization is carried out on the salt solution, mother liquor, condensate and crystallization salt are respectively collected; then, electrolyzing the mother liquor; (3) and (3) carrying out MVR evaporation crystallization on the electrolyzed mother solution in the step (2) again. On the premise of not increasing water quantity, the invention uses electrodialysis to separate COD from sodium chloride salt; carrying out biochemical treatment on high-concentration COD in the fresh water; carrying out MVR evaporation treatment on high sodium chloride salt in the concentrated water; solves the problem of treatment contradiction between high COD and high salt content.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a high-concentration pickle wastewater treatment process.
Background
Although the diluted biological treatment method can effectively treat COD, ammonia nitrogen and phosphorus, the problem of sodium chloride salt discharge cannot be solved, so that a large amount of sodium chloride salt is discharged into a water body, and ecological balance is damaged. In order to solve the problem of salt discharge, the conventional method is MVR evaporative crystallization, but the amount of treated water after dilution is increased, the salt concentration is low, a concentration device needs to be added, and the investment is large. If MVR evaporation concentration is directly carried out on the high-concentration pickle wastewater, the high-concentration COD in the wastewater can cause excessive evaporation residual liquid; and can cause the MVR concentrated solution to form high-viscosity salt slurry, so that the heat exchange effect is reduced rapidly, the crystallized salt is not easy to dehydrate, and the salt is easy to smell. Therefore, the MVR is used for evaporation desalination, and the COD in the wastewater needs to be pretreated.
Therefore, the key problems to be solved by the wastewater treatment are as follows: under the premise of not increasing the water quantity of the high-concentration pickle wastewater, the COD is removed by adopting a biological treatment method, and the salt concentration must be reduced; the COD concentration must be reduced to desalt by MVR evaporative crystallization.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the high-concentration pickle wastewater treatment process, which can effectively solve the problem that the COD in the pickle wastewater cannot be removed by adopting a biological treatment method on the premise of not increasing the water quantity of the high-concentration pickle wastewater when the pickle wastewater is treated by the existing method.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a high-concentration pickle wastewater treatment process comprises the following steps:
(1) adjusting the pH value of the pretreated pickle wastewater to be alkaline, separating by electrodialysis to obtain COD fresh water and a salt solution with the salt concentration of 15-20%, and performing biochemical treatment on the COD fresh water;
(2) carrying out MVR evaporation crystallization on a salt solution at 75-90 ℃ and-0.04-0.02 MPa, and respectively collecting mother liquor, condensate and crystallized salt; wherein, the condensate enters a biochemical system for treatment, and then the mother liquor is electrolyzed periodically until more than 70 percent of COD contained in the mother liquor is removed;
(3) and (3) returning the electrolyzed mother solution in the step (2) to MVR, and continuing to perform evaporative crystallization at 75-90 ℃ and-0.04-0.02 MPa.
Further, the pretreatment process of the pickle wastewater in the step (1) comprises the following steps: placing the pickle wastewater in a grid pool, removing suspended matters in the pickle wastewater, adjusting the pH value of the pickle wastewater to be alkaline, and removing colloidal suspended matters in the pickle wastewater.
Further, the biochemical treatment in the step (1) comprises the following specific processes: and (3) introducing the COD fresh water into the anaerobic tank and the aerobic tank in sequence for treatment.
Further, sodium hydroxide is adopted in the step (1) to adjust the pH value of the pretreated pickle waste water to be 8-10.
Further, the salt content of the salt solution obtained by the treatment in the step (1) is 15%, and the salt content of the fresh water is 2000 mg/L.
Further, drying the crystal salt separated in the step (2) at a high temperature of 800-900 ℃.
Further, the MVR evaporative crystallization in the step (2) comprises the following processes: pumping the salt solution into an MVR system for evaporation and concentration, introducing the condensate into a biochemical system for treatment, returning the electrolyzed mother solution to the MVR after electrolysis treatment, and utilizing the crystallized salt after high-temperature carbonization and purification.
Further, the current density during electrolysis in the step (2) is 40-50 mA/cm2。
Further, the biochemical system in the step (2) comprises an anaerobic tank, an aerobic tank and a secondary sedimentation tank which are communicated in sequence; and (3) sequentially introducing the condensate separated in the step (2) into a biochemical system for treatment, and removing pollutants in the condensate.
The invention has the beneficial effects that:
(1) according to the invention, the pH is firstly adjusted to be alkaline, so that heavy metals can be removed, a large amount of precipitate can be generated to remove part of COD, colloidal substances and substances insoluble in alkali in water are precipitated and filtered, the water quality is changed from turbidity to color clarity, and the removal rate of the COD is 37.8%.
(2) On the premise of not increasing water quantity, the invention uses electrodialysis to separate COD from sodium chloride salt; carrying out biochemical treatment on high-concentration COD in the fresh water; carrying out MVR evaporation treatment on high sodium chloride salt in the concentrated water; solves the problem of treatment contradiction between high COD and high salt content.
(3) According to the invention, the salt is concentrated, so that the water treatment amount of MVR is reduced, the investment and the operating cost are reduced, and meanwhile, the purity of the crystallized salt of the MVR system is higher, so that the MVR system is beneficial to recycling or disposal.
(4) The residual evaporation liquid amount of the MVR system is small, and the residual evaporation liquid can be returned to the MVR system after electrocatalytic oxidation or can be pumped into a biochemical system for treatment in a small amount. And a mother liquor treatment device is not additionally arranged, so that the investment and the operating cost are saved.
(5) The electrocatalysis of the invention converts chloride ions of sodium chloride into chlorine gas while treating the COD of the mother liquor, and is used for effluent disinfection of biochemical treatment, thus not only saving the cost, but also effectively utilizing the chlorine gas, and avoiding air pollution caused by the discharge of the chlorine gas into the air.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Example 1
A high-concentration pickle wastewater treatment process comprises the following steps:
(1) adjusting the grille: removing a large amount of suspended matters in the pickle wastewater through grid treatment, and then adjusting the water quality and the water quantity in an adjusting tank;
(2) and (3) pH adjustment treatment: the pH value of the raw water of the pickle wastewater is 5, the pH value of the wastewater is adjusted to be alkaline, and a small amount of heavy metal (if any) and colloidal substances are precipitated, so that the wastewater is clarified and transparent from turbidity, and the subsequent electrodialysis treatment is facilitated;
(3) electrodialysis treatment: performing sodium chloride salt concentration and COD separation on the pickle wastewater by utilizing electrodialysis, and separately treating high-concentration COD fresh water and high-concentration sodium chloride salt concentrated water to respectively obtain a salt solution with the salt content of 15% and a fresh water solution with the salt content of 2000 mg/L;
(4) MVR treatment: allowing the salt solution generated by electrodialysis to enter MVR (mechanical vapor recompression) for evaporation and crystallization, and respectively collecting mother liquor, condensate and crystallized salt; wherein, the condensate is discharged into a biochemical system for treatment, and the crystallized salt is recycled; the biochemical system comprises an anaerobic tank, an aerobic tank and a secondary sedimentation tank which are communicated in sequence;
(5) mother liquor electrocatalysis treatment: the mother liquor generated by the MVR system enters an electro-catalytic reactor at a current density of 40mA/cm2The COD contained therein is removed by electrolysis, while a disinfection tank leading to a biochemical system which generates chlorine gas is used for disinfection treatment. And returning the mother liquor with reduced COD to MVR for evaporation and crystallization.
(6) Biochemical treatment: and (4) allowing the MVR condensate and fresh water generated by electrodialysis to enter a biochemical system for treatment, removing pollutants such as COD (chemical oxygen demand), ammonia nitrogen and the like, and discharging after the treatment reaches the standard.
(7) A sludge treatment unit: and the sludge generated in the sedimentation tank and the secondary sedimentation tank is lifted to a sludge concentration tank by a sludge pump, and is subjected to filter pressing dehydration and then outsourcing treatment to avoid secondary pollution, and the filtrate is returned to the regulating tank for treatment.
(8) And (3) crystal salt treatment: only sodium hydroxide is added in the treatment process, so the components of the crystal salt mainly comprise sodium chloride and organic matters or substances originally contained in raw water, and the organic matters are easy to decay and stink. The salt can be dried at a high temperature of 800 ℃ to completely combust and oxidize organic matters in the salt into carbon dioxide and nitrogen oxide gas, thereby obtaining pure salt. Can be used as industrial salt or outsourcing treatment or purification and reuse.
Example 2
Under the conditions of large water quantity and low COD concentration, the method of replacing electrodialysis by low temperature rise MVR can be adopted, and at the moment, the treatment process of the high-concentration pickle wastewater specifically comprises the following steps:
(1) adjusting the grille: removing a large amount of suspended matters in the pickle wastewater through grid treatment, and then adjusting the water quality and the water quantity in an adjusting tank;
(2) and (3) pH adjustment treatment: the pH value of the raw water of the pickle wastewater is 5, the pH value of the wastewater is adjusted to be alkaline, and a small amount of heavy metal (if any) and colloidal substances are precipitated, so that the wastewater is clarified and transparent from turbidity, and the subsequent electrodialysis treatment is facilitated;
(3) MVR treatment: pumping the product obtained in the step (2) into an MVR with the temperature of 75 ℃ and the pressure of-0.04 MPa, then pumping circulating steam in the MVR into a steam compressor, increasing the temperature by 8.5 ℃ (namely low temperature rise), concentrating until the salt content in the solution is 15 percent, then pumping concentrated solution into an MVR (namely high temperature rise) system with the temperature increased by 18 ℃ after the circulating steam passes through the steam compressor, continuously performing evaporation and crystallization, and concentrating until the water content of the salt solution is 5 percent; condensate generated by the low-temperature-rise MVR and the high-temperature-rise MVR is discharged into a biochemical system for treatment, and crystallized salt is recycled; wherein, the biochemical system comprises an anaerobic tank, an aerobic tank and a disinfection tank which are communicated in sequence;
(4) mother liquor electrocatalysis treatment: the mother liquor generated by the MVR system enters an electro-catalytic reactor and is subjected to current density of 40mA/cm2The COD in the wastewater is removed by electrolysis, and a disinfection tank which generates chlorine and is introduced into a biochemical system is used for disinfection treatment. And returning the mother liquor with reduced COD to MVR for evaporation and crystallization.
(5) Biochemical treatment: and (4) treating the fresh water generated by electrodialysis in a biochemical system to remove pollutants such as COD (chemical oxygen demand), ammonia nitrogen and the like, and discharging the treated fresh water after reaching the standard.
(6) A sludge treatment unit: and the sludge generated in the sedimentation tank and the secondary sedimentation tank is lifted to a sludge concentration tank by a sludge pump, and is subjected to filter pressing dehydration and then outsourcing treatment to avoid secondary pollution, and the filtrate is returned to the regulating tank for treatment.
(7) And (3) crystal salt treatment: only sodium hydroxide is added in the treatment process, so the components of the crystal salt mainly comprise sodium chloride and organic matters or substances originally contained in raw water, and the organic matters are easy to decay and stink. The salt can be dried at high temperature, and organic matters in the salt are thoroughly combusted and oxidized into carbon dioxide and nitrogen oxide gas, so that pure salt is obtained. Can be used as industrial salt or outsourcing treatment or purification and reuse.
Example 3
Under the conditions of large water quantity and high COD concentration, low temperature rise MVR can be adopted to replace electrodialysis, and at the moment, the high-concentration pickle wastewater treatment process specifically comprises the following steps:
(1) adjusting the grille: removing a large amount of suspended matters in the pickle wastewater through grid treatment, and then adjusting the water quality and the water quantity in an adjusting tank;
(2) and (3) pH adjustment treatment: the pH value of the raw water of the pickle wastewater is 5, the pH value of the wastewater is adjusted to be alkaline, and a small amount of heavy metal (if any) and colloidal substances are precipitated, so that the wastewater is clarified and transparent from turbidity, and the subsequent electrodialysis treatment is facilitated;
(3) MVR treatment: pumping the product obtained in the step (2) into an MVR with the temperature of 75 ℃ and the pressure of-0.04 MPa, then pumping circulating steam in the MVR into a steam compressor, increasing the temperature by 8.5 ℃ (namely low temperature rise), concentrating until the salt content in the solution is 50 percent, then pumping concentrated solution into an MVR (namely high temperature rise) system with the temperature increased by 18 ℃ after the circulating steam passes through the steam compressor, continuously performing evaporation and crystallization, and concentrating until the water content of the salt solution is 15 percent; condensate generated by the low-temperature-rise MVR and the high-temperature-rise MVR is discharged into a biochemical system for treatment, and crystallized salt is recycled; wherein, the biochemical system comprises an anaerobic tank, an aerobic tank and a disinfection tank which are communicated in sequence;
(4) treating the mother liquor by a single-effect evaporation method: because COD all enters MVR, the discharge interval of the mother liquor is short, the discharge amount is large, a set of single-effect evaporation system is needed to be arranged to evaporate the mother liquor to dryness, the incineration treatment or outsourcing treatment is carried out, and the condensate liquid returns to the biochemical system for treatment.
(5) Biochemical treatment: fresh water generated by electrodialysis and MVR condensate and mother liquor single-effect evaporation condensate enter a biochemical system for treatment, pollutants such as COD (chemical oxygen demand), ammonia nitrogen and the like are removed, and the treated pollutants reach the standard and are discharged.
(6) A sludge treatment unit: and the sludge generated in the sedimentation tank and the secondary sedimentation tank is lifted to a sludge concentration tank by a sludge pump, and is subjected to filter pressing dehydration and then outsourcing treatment to avoid secondary pollution, and the filtrate is returned to the regulating tank for treatment.
(7) And (3) crystal salt treatment: only sodium hydroxide is added in the treatment process, so the components of the crystal salt mainly comprise sodium chloride and organic matters or substances originally contained in raw water, and the organic matters are easy to decay and stink. The salt can be dried at high temperature, and organic matters in the salt are thoroughly combusted and oxidized into carbon dioxide and nitrogen oxide gas, so that pure salt is obtained. Can be used as industrial salt or outsourcing treatment or purification and reuse.
The results of treating high-concentration pickle wastewater with pH value of 5, COD content of 32140.8mg/L and salt content of 43600mg/L by the methods of the embodiments 1-3 of the invention are shown in Table 1.
TABLE 1 physicochemical index of pickled vegetable wastewater after treatment
As can be seen from the data in Table 1, the COD value and the salt content in the pickle wastewater can be effectively reduced in the embodiments 1 to 3, the pickle wastewater treated in the embodiments 1 to 3 meets the discharge standard, and meanwhile, the COD in the pickle wastewater can be removed by adopting a biological treatment method on the premise of not increasing the water quantity of the high-concentration pickle wastewater.
Claims (7)
1. A high-concentration pickle wastewater treatment process is characterized by comprising the following steps:
(1) adjusting the pH value of the pretreated pickle wastewater to be alkaline, separating by electrodialysis to obtain COD fresh water and a salt solution with the salt concentration of 15-20%, and performing biochemical treatment on the COD fresh water;
(2) carrying out MVR evaporation crystallization on a salt solution at 75-90 ℃ and-0.04-0.02 MPa, and respectively collecting mother liquor, condensate and crystallized salt; wherein, the condensate enters a biochemical system for treatment, and then the mother liquor is electrolyzed until more than 70 percent of COD contained in the mother liquor is removed;
(3) and (3) returning the electrolyzed mother solution in the step (2) to MVR, and continuing to perform evaporative crystallization at 75-90 ℃ and-0.04-0.02 MPa.
2. The process for treating kimchi wastewater in high concentration according to claim 1, wherein the pretreatment process of the kimchi wastewater in step (1) is: placing the pickle wastewater in a grid pool, removing suspended matters in the pickle wastewater, adjusting the pH value of the pickle wastewater to be alkaline, and removing colloidal suspended matters in the pickle wastewater.
3. The process for treating high-concentration kimchi wastewater according to claim 1 or 2, wherein the pH of the pretreated kimchi wastewater is adjusted to 8-10 by sodium hydroxide in the step (1).
4. The process for treating kimchi wastewater in high concentration according to claim 1, wherein the specific process of the biochemical treatment in step (1) is: and (3) introducing the COD fresh water into the anaerobic tank and the aerobic tank in sequence for treatment.
5. The process for treating high concentration kimchi wastewater of claim 1, wherein the crystal salt separated in the step (2) is dried at a high temperature of 800-900 ℃.
6. The process for treating kimchi wastewater in high concentration according to claim 1, wherein the current density in the electrolysis in the step (2) is 40 to 50mA/cm2。
7. The process for treating kimchi wastewater in high concentration according to claim 1, further comprising introducing the condensate separated in step (2) into an anaerobic tank and an aerobic tank in sequence for treatment to remove contaminants therein.
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