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Integrated biochemical treatment method for high-salt wastewater

A technology for biochemical treatment and high-salt wastewater, applied in chemical instruments and methods, special compound water treatment, water/sludge/sewage treatment, etc., can solve the problems of poor biochemical treatment of saline wastewater, frequent equipment maintenance, high operating costs, etc. problems, to achieve obvious energy-saving effects, speed up domestication, and reduce operating costs

Pending Publication Date: 2019-10-25
ZHEJIANG ZONE KING ENVIRONMENTAL SCI&TECH CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because high-concentration salt substances have an inhibitory effect on microorganisms, the biochemical treatment effect of saline wastewater is poor; and the traditional processes such as wastewater concentration and salt steaming currently used have the defects of large investment, high operating costs, and frequent equipment maintenance. A large amount of waste salt residue will be generated, which is difficult to handle

Method used

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  • Integrated biochemical treatment method for high-salt wastewater

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Effect test

Embodiment 1

[0033] For a spice synthesis chemical project, the treated water volume is 1200t / d, the influent CODcr, ammonia nitrogen, and salinity are respectively 10,000mg / L, 120mg / L, and 2% (mixed salt mainly composed of sodium sulfate and sodium acetate), and the effluent CODcr and ammonia nitrogen are required to reach 400mg / L and 30mg / L respectively, and high-salt combined biochemical process (anaerobic + facultative + aerobic) is used for treatment, in which the salt-tolerant bacteria are added externally, and the total amount of dosage is about 200mg / L, and added 2g / L biochemical sludge, adopting batch dosing method, adopting 3000mg / L step-up domestication method; the system uses microporous aeration plate for aeration, uses sedimentation tank to intercept sludge, and does not use carrier Filler, by adjusting pH (6-8.5), DO (DO in the anaerobic section is about 0.05mg / L, DO in the anoxic section is 0.15mg / L, and DO in the aerobic section is about 3mg / L), ORP (anoxic section range ...

Embodiment 2

[0035] For a new material production project, the water treatment volume is 1000t / d, the influent CODcr, ammonia nitrogen, and salinity are 4000mg / L, 50mg / L and 3% (mixed salt mainly composed of sodium sulfate and sodium chloride), and the effluent CODcr , ammonia nitrogen are required to reach 300mg / L and 25mg / L respectively, and are treated with a high-salt combined biochemical process (facultative oxygen + aerobic) treatment, in which the salt-tolerant bacteria are added externally, and the total dosage is about 100mg / L. Added 1.5g / L biochemical sludge, adopted batch dosing method, and adopted 4000mg / L step-up domestication method; (6.5-8.5), DO (the DO in the anoxic section is 0.25mg / L, and the DO in the aerobic section is about 2mg / L), ORP (-200mV in the anoxic section), temperature (18-35℃), and combined The dosing of key activation elements (the dosing concentrations of iron, cobalt, and nickel are 2mg / L, 0.4mg / L, and 0.4mg / L respectively, and the dosing ratio of C, N, ...

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Abstract

The invention relates to an environmental protection facility, and aims to provide an integrated biochemical treatment method for high-salt wastewater. The integrated biochemical treatment method hasthe characteristics of no need of long-term continuous dosing of salt-tolerant bacteria and good system stability. According to the technical scheme, the integrated biochemical treatment method for high-salt wastewater comprises the steps that an anaerobic tank and an facultative tank which are equipped with stirring devices and an aerobic tank with an aerating device are adopted, the anaerobic tank, the facultative tank and the aerobic tank communicate with in turn, tank water is equipped with the salt-tolerant bacteria, key activation elements and nutrients are added; the salt-tolerant bacteria are externally put in stages, or / and biochemical sludge (preferably sludge flowing back in a sedimentation tank) is used for upgrading step culture through domestication; the domestication upgrading step is 2,000mg / L-5,000mg / L; the staged external putting is that the salt-tolerant bacteria is put once at the time of increasing of the salinity, or the salt-tolerant bacteria is put once in a multiple step increasing mode; and the increasing degree of salinity single step should not exceed 0.5%, and finally a salt-tolerant biochemical system with the tolerance of salinity less than 6% is obtained.

Description

technical field [0001] The invention relates to an environmental protection facility, in particular to an integrated biochemical treatment method for treating high-salt wastewater. Background technique [0002] High-salt wastewater refers to wastewater with a total salt content of at least 1% or more. It mainly comes from chemical and pharmaceutical companies, seafood processing plants, pickle processing plants and other industrial enterprises. Salt-containing wastewater is produced in a wide range of ways, and the water volume is also large increase yearly. Because high-concentration salt substances have an inhibitory effect on microorganisms, the biochemical treatment effect of saline wastewater is poor; and the traditional processes such as wastewater concentration and salt steaming currently used have the defects of large investment, high operating costs, and frequent equipment maintenance. A large amount of waste salt slag will be produced, which is difficult to handle...

Claims

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Application Information

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IPC IPC(8): C02F3/30
CPCC02F3/30C02F2305/06
Inventor 唐全王宇峰王建超张卫明王衡
Owner ZHEJIANG ZONE KING ENVIRONMENTAL SCI&TECH CO LTD
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