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High-concentration pickle wastewater treatment process

A technology for wastewater treatment and high concentration, which is used in food industry wastewater treatment, water/sewage treatment, water treatment parameter control, etc.

Inactive Publication Date: 2019-12-20
四川恒泰环境技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a high-concentration kimchi wastewater treatment process, which can effectively solve the problem that the prior method cannot use biological treatment without increasing the amount of high-concentration kimchi wastewater. method to remove COD

Method used

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  • High-concentration pickle wastewater treatment process

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Effect test

Embodiment 1

[0026] A high-concentration kimchi wastewater treatment process, comprising the following steps:

[0027] (1) Grille adjustment: remove a large amount of suspended solids in the kimchi wastewater through grid treatment, and then adjust the water quality and quantity in the adjustment tank;

[0028] (2) PH adjustment treatment: the pH of the raw water of kimchi wastewater is 5, adjust the pH of the wastewater to alkaline, and precipitate a small amount of heavy metals (if any) and colloidal substances, so that the wastewater becomes clear and transparent from turbidity, which is conducive to subsequent electrodialysis treatment;

[0029] (3) Electrodialysis treatment: Use electrodialysis to carry out sodium chloride salt concentration and COD separation to pickle wastewater, and separate high-concentration COD fresh water and high sodium chloride salt concentrated water to obtain salt solutions with a salt content of 15% respectively and a fresh water solution with a salt conte...

Embodiment 2

[0036] In the case of a large amount of water and a low COD concentration, low-temperature rising MVR can be used instead of electrodialysis. At this time, the high-concentration kimchi wastewater treatment process specifically includes the following steps:

[0037] (1) Grille adjustment: remove a large amount of suspended solids in the kimchi wastewater through grid treatment, and then adjust the water quality and quantity in the adjustment tank;

[0038] (2) PH adjustment treatment: the pH of the raw water of kimchi wastewater is 5, adjust the pH of the wastewater to alkaline, and precipitate a small amount of heavy metals (if any) and colloidal substances, so that the wastewater becomes clear and transparent from turbidity, which is conducive to subsequent electrodialysis treatment;

[0039] (3) MVR treatment: the product obtained in step (2) is pumped into the MVR at 75°C and -0.04MPa, and then the circulating steam in the MVR passes through the steam compressor and the tem...

Embodiment 3

[0045] In the case of large water volume and high COD concentration, low-temperature rising MVR can be used instead of electrodialysis. At this time, the high-concentration kimchi wastewater treatment process specifically includes the following steps:

[0046] (1) Grille adjustment: remove a large amount of suspended solids in the kimchi wastewater through grid treatment, and then adjust the water quality and quantity in the adjustment tank;

[0047] (2) PH adjustment treatment: the pH of the raw water of kimchi wastewater is 5, adjust the pH of the wastewater to alkaline, and precipitate a small amount of heavy metals (if any) and colloidal substances, so that the wastewater becomes clear and transparent from turbidity, which is conducive to subsequent electrodialysis treatment;

[0048] (3) MVR treatment: the product obtained in step (2) is pumped into the MVR at 75°C and -0.04MPa, and then the circulating steam in the MVR passes through the steam compressor and the temperature...

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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 alkali, then obtaining salt solution and COD fresh water through electrodialysis separation, and carrying out biochemical treatment on the COD fresh water; (2) carrying out MVR evaporation crystallization on that salt solution, respectively collecting the mother liquor, the condensate and the crystalline salt; then electrolyzing the mother liquor; (3) subjecting the electrolyzed mother liquor in the step (2) to MVR evaporation crystallization again. According to the invention, COD and sodium chloride salt are separated by electrodialysis on the premise of not increasing water quantity; biochemical treatment of high concentration COD in fresh water is performed; MVR evaporation treatment on sodium chloride salt in concentrated water is performed; the problem of treatment contradiction between high COD and high salt content is solved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a high-concentration kimchi wastewater treatment process. Background technique [0002] Although the biological treatment method after dilution can effectively treat COD, ammonia nitrogen and phosphorus, it cannot solve the problem of sodium chloride salt discharge, resulting in a large amount of sodium chloride salt being discharged into the water body and destroying the ecological balance. To solve the problem of salt discharge, the currently commonly used method is MVR evaporation crystallization, but after dilution, the amount of water to be treated increases and the salt concentration is low, so it is necessary to increase the concentration device, which requires a large investment. If the high-concentration kimchi wastewater is directly concentrated by MVR evaporation, the high-concentration COD in the wastewater will lead to too much evaporation re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/122C02F101/20C02F101/30C02F103/32
CPCC02F1/001C02F1/04C02F1/46104C02F1/4693C02F1/66C02F1/76C02F3/30C02F9/00C02F11/122C02F2101/20C02F2101/30C02F2103/32C02F2209/08C02F2303/04
Inventor 杨红梅肖德龙黄莉杨汉军刘泉蒲柳李江姚铭唐俊黄文凤刘世林张亚明郑庆生杜洪飞
Owner 四川恒泰环境技术有限责任公司
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