A biological treatment method for refractory organic wastewater

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...

AI Technical Summary

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

Images