Short-cut denitrifying bacteria-dissimilatory nitrate reducing bacteria-short-cut nitrifying bacteria-anaerobic ammonium oxidation bacteria synergistic denitrification method

Abstract

The invention relates to a short-cut denitrifying bacterium-dissimilatory nitrate reducing bacterium-short-cut nitrifying bacterium-anaerobic ammonium oxidation bacterium synergistic denitrification method. The method is carried out on the basis of an immobilized pellet, and the immobilized pellet is prepared by taking a cross-linked polymerization product of polyvinyl alcohol, sodium alginate and gelatinized starch as a carrier and embedding anaerobic ammonium oxidation bacteria, short-cut denitrifying bacteria, hort-cut nitrifying bacteria and dissimilatory nitrate reducing bacteria. According to the method disclosed by the invention, the four reactions of anaerobic ammonia oxidation, short-cut nitrification, short-cut denitrification and dissimilatory nitrate reduction are successfully and synchronously carried out, and the four reaction processes are combined to remove nitrogen and carbon, so ammonia nitrogen, nitrate nitrogen and COD are successfully and synchronously removed in one reaction system, and the denitrification efficiency of the system is improved, meanwhile; and the immobilized pellet is beneficial to maintaining a higher biomass concentration and biological activity in the system, an outer-aerobic and inner-anaerobic structure is formed, and the operation stability of the system is enhanced.

Description

technical field [0001] The invention relates to a method for synergistic denitrification of short-range denitrifying bacteria-dissimilating nitrate-reducing bacteria-short-range nitrifying bacteria-anammox bacteria, and belongs to the technical field of sewage treatment. Background technique [0002] The rapid economic development of our country has led to the continuous increase of sewage discharge, the eutrophication of water body is becoming more and more serious, and the removal of nitrogen in sewage has gradually become a hot spot. The traditional nitrification-denitrification process of biological denitrification process has problems such as high treatment cost, large floor area, complicated process operation and large amount of residual sludge. Therefore, it is imperative to develop a new type of efficient and sustainable biological denitrification system that reduces energy consumption, reduces costs, and a series of high-efficiency and low-consumption combined denit...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that anammox sludge is easy to lose in the sewage treatment system, dissolved oxygen and organic matter affect the activity of anammox sludge, NO 2 - Insufficient sources and unstable denitrification system, etc., provide a method for synchronous PD-PN-Anammox-DNRA treatment of carbon and nitrogen-containing wastewater based on immobilized pellets. The immobilized pellets of the present invention are based on polyvinyl alcohol, The cross-linked polymerization product of sodium alginate and gelatinized starch is used as a carrier, and the immobilized pellets formed by embedding anammox bacteria, short-range denitrifying bacteria, short-range denitrifying bacteria and DNRA bacteria are successfully realized by the method of the present invention. The four reactions of ammonium oxidation, short-range nitrification, short-range denitrification and nitrate dissimilation reduction are carried out simultaneously, and the four reaction processes are combined to remove nitrogen and carbon, and successfully realize the simultaneous removal of ammonia nitrogen, nitrate nitrogen and COD in one reaction system. Improve the nitrogen removal efficiency of the system, while the immobilized pellets help maintain a high biomass concentration and biological activity in the system, and enhance the stability of the system operation