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A zero-discharge system and process for recycling high-salt and high-cod wastewater

A waste water recovery and zero discharge technology, which is applied in descaling and water softening, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of large fluctuations in water quality, high concentration, complex organic components, etc., and achieve evaporation energy Low consumption, high efficiency of salt separation and high concentration ratio

Active Publication Date: 2021-12-10
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2. Organic components are complex, high concentration, high COD concentration, and poor biochemical properties. Chemical production wastewater contains ethers, phenols, and hydrocarbons. The high salt content restricts the activity of microorganisms. Therefore, traditional biochemical methods cannot effectively remove wastewater pollution. substance
3. The water quality fluctuates greatly. According to the uncertainty of the production volume requirements of the enterprise wastewater, the water quality and quantity of the discharged wastewater have large fluctuations.
Most of the concentration part adopts a variety of membrane coupling technologies, such as NF (nanofiltration) + RO (reverse osmosis), EDI (electrodialysis) + RO (reverse osmosis), FO (forward osmosis) + RO (reverse osmosis) coupling concentration process , but both forward osmosis technology and electrodialysis technology have certain limitations. Although forward osmosis technology does not require the promotion of high-pressure pumps, it needs to match a suitable drive fluid and filter membrane; electrodialysis technology is suitable for a salt content of 4000-5000mg / L , too high salinity affects the desalination efficiency

Method used

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  • A zero-discharge system and process for recycling high-salt and high-cod wastewater
  • A zero-discharge system and process for recycling high-salt and high-cod wastewater
  • A zero-discharge system and process for recycling high-salt and high-cod wastewater

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Effect test

Embodiment 1

[0043] A zero-discharge system for recycling high-salt and high-COD wastewater, including:

[0044] High-efficiency pretreatment unit: the wastewater in the regulating tank enters the Fenton system to oxidize and remove some organic matter, enters the softening tank to remove hardness, and the produced water enters the MBR membrane bioreactor to further remove organic pollutants and turbidity through the action of microorganisms, and then enters the ultrafiltration system , after ion exchange;

[0045] Two-stage concentration unit: firstly remove carbon through the carbon remover, enter the first-stage RO system for concentration reduction through security filtration, and then obtain sodium chloride brine and sodium sulfate brine through two-stage nanofiltration system treatment, and then enter the second stage respectively The RO concentration system further concentrates and reduces the weight;

[0046] Evaporation and crystallization unit: After concentrated by high-pressur...

Embodiment 2

[0056] A zero-discharge system for recycling high-salt and high-COD wastewater, including:

[0057] High-efficiency pretreatment unit: the wastewater in the regulating tank enters the Fenton system to oxidize and remove some organic matter, enters the softening tank to remove hardness, and the produced water enters the MBR membrane bioreactor to further remove organic pollutants and turbidity through the action of microorganisms, and then enters the ultrafiltration system , after ion exchange;

[0058] Two-stage concentration unit: firstly remove carbon through the carbon remover, enter the first-stage RO system for concentration reduction through security filtration, and then obtain sodium chloride brine and sodium sulfate brine through two-stage nanofiltration system treatment, and then enter the second stage respectively The RO concentration system further concentrates and reduces the weight;

[0059] Evaporation and crystallization unit: After being concentrated by high-p...

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Abstract

The invention discloses a high-salt and high-COD waste water recovery zero-discharge process, which comprises the following steps: step 1, pretreating high-salt and high-COD waste water to remove COD, total nitrogen, SS, and heavy metal ions; step 2, treating the pretreated waste water After the waste water is concentrated by RO-NF-NF-RO through double-stage concentration to obtain a high concentration of Na 2 SO 4 solution and NaCl solution; Step 3, using high-pressure flat membrane to filter high-concentration Na 2 SO 4 solution and NaCl solution, evaporated and concentrated to obtain a crystalline salt with a purity >99%. The process of the present invention is progressive in the treatment of high-salt wastewater. The whole process has no waste water discharge, can remove characteristic target pollutants, and can ensure the water intake requirements of the next step reaction. The waste water recovery rate of the system process is close to 100% %.

Description

technical field [0001] The invention relates to a high-salt and high-COD wastewater recovery zero-discharge system and process, belonging to the field of wastewater treatment. Background technique [0002] In recent years, with the shortage of water resources in the country and the scarcity of fresh water resources in Northwest China, the requirements for zero discharge of wastewater treatment are getting higher and higher. Especially in the northwestern region of our country, in the face of severe water use conditions, it is necessary to develop new, energy-saving, economical and efficient zero-discharge wastewater treatment processes. The government encourages enterprises to increase the recovery rate of industrial water, improve the efficiency of reclaimed water reuse, and maximize energy saving and emission reduction. [0003] High-salt and high-COD wastewater is a kind of industrial wastewater that is difficult to treat. The bottleneck of treatment technology is relati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C01D3/04C01D5/00
CPCC02F9/00C01D3/04C01D5/00C02F2305/026C02F1/725C02F1/722C02F5/00C02F5/08C02F3/1268C02F1/42C02F2001/425C02F1/444C02F1/441C02F1/442C02F1/048C02F1/06
Inventor 孔令涛谢超刘锦淮
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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