Method for quickly improving enrichment rate and degree of ammonia-oxidizing bacteria (AOB) in sequencing batch reactor (SBR)

Abstract

The invention discloses a method for quickly improving the enrichment rate and degree of ammonia-oxidizing bacteria (AOB) in a sequencing batch reactor (SBR). The method is characterized by adopting an activated sludge process to treat ammonia-nitrogen wastewater in the SBR, using the mobile slope (MSC) of the oxidation-reduction potential (ORP) as an indication parameter of the ammoxidation process and increasing the enrichment rate of the AOB, improving the enrichment degree of the AOB by firstly improving the ammonia-nitrogen concentrations of feedwater gradually to culture the activities of nitrifying bacteria and then utilizing high free ammonia (50-65mg NH3 / L), high free nitrite acid (2-8mgHNO2-N / L) and proper amount of discharged sludge to elutriate nitrite nitrogen oxidizing bacteria and heterotrophic bacteria out of the system. The enrichment rate and degree of the AOB in the SBR are quickly improved by adopting the method. An AOB enrichment reactor can increase the proportion of the AOB in the total bacteria to 11% from 3% in about 40 days and improve the proportion to 90% in about 100 days. The sludge load can reach 1.31kgNH4<+>-N / (gvss.d). The method has the advantages of short AOB enrichment time, high AOB enrichment degree, flexibility in control and the like.

Description

technical field [0001] The invention relates to a method for rapidly increasing the enrichment rate and degree of ammonia oxidizing bacteria in a sequencing batch reactor, and belongs to the technical field of sewage biological treatment. Background technique [0002] The deteriorating water environment has attracted people's attention. Nitrogen pollution is one of the important reasons for the "eutrophication" of water bodies. Treating sewage with biological denitrification technology has the advantages of high efficiency, economy, and environmental protection. Ammonia oxidizing bacteria can oxidize ammonia nitrogen to nitrite nitrogen, which is an important part of the nitrifying bacteria group, but the growth rate of ammonia oxidizing bacteria is small, and it is not easy to be enriched. In the traditional denitrification process of sewage treatment plants, ammonia oxidizing bacteria only account for 1 to 5% of the total number of bacteria, and the ammonia oxidation abil...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low enrichment degree of ammonia oxidizing bacteria and long enrichment time of ammonia oxidizing bacteria, and provide a method for rapidly improving the enrichment rate and degree of ammonia oxidizing bacteria in a sequencing batch reactor

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