Treatment method for difficultly-degraded organic wastewater

Abstract

The invention discloses a treatment method for difficultly-degraded organic wastewater. According to the treatment method, an anoxic unit, an aerobic unit and a denitrification unit are arranged, a nitrosation dominant flora and a microorganism growth promoter D are poured into the aerobic unit and the nitrosation rate in the effluent is controlled at 65-80%, one part of the effluent of the aerobic unit refluxes to the anoxic unit and the reflux ratio is controlled at 15-25%, the other part of the effluent of the aerobic unit enters the denitrification unit, denitrification particle sludge and a microorganism growth promoter E are poured into the denitrification unit, treatment is performed with the denitrification unit so as to discharge, the promoter D comprises a metal salt, a polyamine substance, organic acid hydroxylamine and Na2SO3, the promoter E comprises a metal salt, a polyamine substance, organic acid hydroxylamine and an organic acid salt, and the metal salt comprises a calcium salt, a copper salt, a magnesium salt and/or a ferrous salt. According to the present invention, the nitrosation dominant flora and the microorganism growth promoter D are poured into the aerobic unit to control the nitrosation rate, and the denitrification particle sludge and the microorganism growth promoter E are poured into the denitrification unit so as to achieve the deep treatment of the COD and the total nitrogen.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a 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 wastewater due to i...

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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