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Method for enhancing biochemical treatment of high-salt organic wastewater by removing high-salt toxicity on microorganisms

A technology for organic wastewater and biochemical treatment, applied in the direction of biological water/sewage treatment, chemical instruments and methods, special compound water treatment, etc., can solve the problems of microorganisms spending a lot of time and cost, increase salt tolerance, improve biological activity, The effect of enhancing the activity

Inactive Publication Date: 2020-09-29
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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Problems solved by technology

However, it will take a lot of time to domesticate microorganisms for a long time

Method used

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  • Method for enhancing biochemical treatment of high-salt organic wastewater by removing high-salt toxicity on microorganisms

Examples

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Effect test

Embodiment 1

[0033] Treatment object: An experimental wastewater with a CODcr concentration of 3000mg / L, a salinity of 20000mg / L, a pH value of 6-8, and a temperature of 28-32°C.

[0034] Treatment effect: Unacclimated activated sludge (the sludge has a high removal rate of COD under low-salt conditions, up to 98%) is added to the reactor, compressed air is introduced into the reaction device, and the internal pressure of the reactor is controlled At 0.3MPa, and adding 0.5mM betaine, the reactor runs for 24 hours, and the COD drops below 200mg / L. The COD removal rate is greater than 93%, and the water effluent effect is better. Compared with the removal rate of about 50% in the normal pressure bioreactor by measuring COD, there is a relatively obvious improvement. Pressurization alone has a COD removal rate of 82%, and betaine alone and a COD removal rate of 77%. Compared with the two methods of the present invention, the effect of simultaneous use is significantly different.

Embodiment 2

[0036] Treatment object: an experimental wastewater with a COD concentration of 3000mg / L, a salinity of 45000mg / L, a pH value of 6-8, and a temperature of 28-32°C.

[0037] Treatment effect: Unacclimated activated sludge is added to the reactor, compressed air is introduced into the reaction device, the internal pressure of the reactor is controlled at 0.4MPa, and 1mM glycerin is added, the reactor runs for 24 hours, and the COD drops below 300mg / L. The COD removal rate is greater than 90%, and the water effluent effect is better. Compared with the removal rate of about 30% in the normal pressure bioreactor, there is a relatively obvious improvement. With pressure alone, the COD removal rate is 76%, and with glycerol alone, the COD removal rate is 74%. The two groups of examples all show that after the treatment of high-salt toxicity by this method, the effluent effect is better than that of non-detoxification, which is beneficial to the enhanced biochemical treatment of high...

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Abstract

The invention discloses a method for enhancing biochemical treatment of high-salt organic wastewater by removing high-salt toxicity on microorganisms. The method is characterized by being mainly realized by coupling pressurization and addition of compatible solutes. By removing the salt toxicity on microorganisms in the salt-containing wastewater, the activity of non-salt-tolerant flora in an original system is maintained, so that the pollutant degradation performance of the flora in the high-salt wastewater is effectively improved. The technical problem of the invention is solved by simultaneously adding a compatible solute and pressurizing in a reactor for the first time; the compatible solutes are glycine betaine, glycerol, sugar alcohol, amino acid and the like, Tween 80 can also be used as an osmotic protective agent, and the substances can contribute to osmotic balance of bacteria and are also effective to halotolerant bacteria and non-halotolerant bacteria; besides, the reactoris pressurized, the pressurization pressure is controlled to be 0.1-0.5 MPa, and due to the fact that proper pressurization is beneficial to improving the biological activity of microorganisms, bacteria can adapt to a severe environment, and the salt resistance of the bacteria can be improved to a certain extent.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a method for enhancing biochemical treatment of high-salt organic waste water (waste water with a total salt content of at least 1% by mass fraction) by eliminating the high-salt toxicity of microorganisms. Background technique [0002] High-salt wastewater refers to wastewater with a total salt content of at least 1%. This type of wastewater is rich in sources and often contains more organic substances and nutrients. For this kind of wastewater, physical and chemical treatment and biochemical treatment are mainly used to remove it. The physical and chemical treatment method is mainly to carry out concentrated crystallization after pretreatment, and concentrated crystallization mainly includes evaporation crystallization (CN 104261612 B is a kind of new treatment device for organic wastewater containing high salt and refractory to degradation, CN 104326615 B is an e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F101/30
CPCC02F3/00C02F2305/06C02F2101/30
Inventor 钱勇兴张科锋靳慧霞张会宁马建青吴钢锋
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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