Biological treatment method for organic wastewater hard to degrade

A technology for organic wastewater and biological treatment, applied in water/sludge/sewage treatment, water pollutants, chemical instruments and methods, etc., can solve problems such as residence time up to 60 hours, limited tolerance, long treatment process, etc. Achieve good wastewater treatment effect, short wastewater treatment process, and improve treatment effect

Active Publication Date: 2017-04-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The anaerobic hydrolytic acidification process has certain advantages in the treatment of refractory organic wastewater, but there are still problems such as low bioconversion rate, limited tolerance of anaerobic hydrolytic acidification microorganisms to the concentration of pollutants, and accumulation of organic acids in the hydrolytic acidification system.
With the traditional activated sludge treatment process being long, occupying a large area, and the contradictions of complex operation have become increasingly prominent, people are trying to improve the degradation efficiency of refractory organic wastewater by improving metabolic strains and reaction process improvement and optimization.
[0005] CN201010218533.9 discloses a compound high-efficiency microbial preparation for refractory wastewater treatment and its preparation and application. The invention solves the difficult problem of refractory organic wastewater treatment by adding bacterial agents, but does not optimize the process, and the wastewater treatment The residence time is still as high as 60 hours or more
CN200710090244.3 discloses a deep denitrification treatment method for high-concentration organic wastewater, which includes anaerobic decarbonization zone, aerobic nitrosation zone plus anammox denitrification zone and traditional nitrification and denitrification It needs to be composed of six independent reaction pools, the treatment process is long, and does not involve the treatment effect of wastewater containing refractory organic matter

Method used

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  • Biological treatment method for organic wastewater hard to degrade

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Embodiment 1

[0026] A certain wastewater contains a small amount of hydrocarbon refractory substances, the average COD concentration is 6500mg / L, the average BOD concentration is 150mg / L, the average total nitrogen concentration is 500mg / L, and the pH is 7.5. The anoxic unit-aerobic unit-denitrification unit combination process of the present invention is used for treatment, wherein in the aerobic unit, the concentration of nitrosative dominant bacteria in the sewage treatment system is 600mg / L, and the concentration of nitrosative dominant bacteria is 600mg / L, and at the same time, according to the sewage treatment The accelerator concentration in the system is 20mg / L, and nitrous bacteria growth accelerator I is added to control the nitrification rate between 75% and 80%. The denitrification unit first adds activated sludge according to the sludge concentration of 1200mg / L, and then According to 0.04% of the volume of wastewater treated per hour, the above-mentioned bacterial agents compo...

Embodiment 2

[0028] A wastewater contains a small amount of nitrogen-containing heterocyclic compounds, with an average COD concentration of 4500mg / L, an average BOD concentration of 120mg / L, an average total nitrogen concentration of 200mg / L, and a pH of 7.8. The anoxic unit-aerobic unit-denitrification unit combination process of the present invention is used for treatment, wherein the aerobic unit is added with nitrosative dominant bacteria according to the concentration of 500 mg / L of nitrosative dominant bacteria in the sewage treatment system, and simultaneously according to the concentration of nitrosative dominant bacteria in the sewage treatment system The accelerator concentration is 25mg / L and the nitrous bacteria growth accelerator II is added to control the nitrification rate between 70%-75%. The denitrification unit first adds activated sludge according to the sludge concentration of 1800mg / L, and then according to 0.08% of the treated wastewater volume per hour is added with ...

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Abstract

The invention discloses a biological treatment method for organic wastewater hard to degrade. The biological treatment method includes an anerobic unit, an aerobiotic unit and a denitrification unit. Nitrosation dominant bacteria and a nitrite bacterium growth accelerant are put in the aerobiotic unit, and the nitritation rate in discharged water is controlled to range from 65% to 80%, wherein one part of the discharged water of the aerobiotic unit flows back to the anerobic unit, the reflux ratio is controlled to range from 25% to 50%, and the other part of the discharged water of the aerobiotic unit enters the denitrification unit and is discharged after being treated through the denitrification unit. The growth accelerant comprises metal salt, polyamine type substances, organic acid hydroxylamine and Na2SO3, wherein the metal salt is composed of calcium salt, copper salt, magnesium salt and/or ferrous salt. The synergistic effect between florae is brought into play by adding the growth accelerant and regulating the reflux ratio of the discharged water of the aerobiotic unit, and therefore treatment for making COD and total nitrogen in the wastewater both reach the standard is achieved. The method has the beneficial effects of being short in flow, capable of reducing land occupation, low in reflux ratio, small in bacterium addition amount, stable in control, high in treatment efficiency, and the like.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a biological treatment method for refractory organic waste water. Background technique [0002] With the rapid development of petrochemical, plastic, synthetic fiber, printing and dyeing, coal chemical and other industries, especially the continuous use of new technologies and new materials, the types of refractory organic pollutants in the wastewater produced by these enterprises are gradually increasing. Wastewater treatment Difficulty increases. Although physical and chemical methods such as advanced oxidation can treat refractory organic wastewater, they are often used in the pretreatment of biological treatment to improve biodegradability due to the disadvantages of high cost, incomplete mineralization, and easy generation of secondary pollution. Biological treatment has attracted increasing attention in the treatment of refractory organic wastewat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/38
Inventor 高会杰孙丹凤郭志华赵胜楠
Owner CHINA PETROLEUM & CHEM CORP
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