A treatment method for refractory organic nitrogen-containing wastewater

Abstract

The invention relates to a treatment method for hardly-degradable organic nitrogen-containing wastewater. The treatment method employs an anoxic unit, an aerobic unit and a denitrification unit, wherein nitrosation dominant bacterial communities and a microbial growth promoter I are fed into the aerobic unit to control the nitrosation rate of effluent to be in a range of 65% to 80%; a part of theeffluent of the aerobic unit flows back to the anoxic unit, and a reflux ratio is controlled to be in a range of 15% to 25%; the other part of the effluent enters the denitrification unit, and denitrifying granular sludge and a microbial growth promoter II are fed into the denitrification unit; the microbial growth promoter I comprises a metal salt, a polyamine substance, organic acid hydroxylamine and Na2SO3; and the microbial growth promoter II comprises glycolipid, sugar alcohol and an organic acid salt. The treatment method achieves the purpose of advanced treatment of COD and total nitrogen by feeding the nitrosation dominant bacterial communities, the denitrifying granular sludge and the growth promoters and promoting the synergism of the bacterial communities in virtue of controlling the reflux ratio of the aerobic unit; and the method has the characteristics of high treatment efficiency, low cost, low reflux ratio, no secondary pollution and so on.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and in particular relates to a treatment method for refractory organic nitrogen-containing wastewater. 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 treatmen...

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 efficiency of refractory organic wastewater by improving metabolic strains and improving and optimizing reaction processes.

[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 the residence time of wastewater treatment is still as high as 60 hours above

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

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