Characterization of The Bacteriological Phase of Coke Wastewater Scale Up Biological Treatment Process
Due to its complex composition and high levels of refractory organics,the degree of biochemical treatment and advanced treatment of coking wastewater affects the overall level of clean production.This paper took the wastewater treatment of coking plant in the northwest region as an example to elaborate on its pretreatment,secondary biological treatment,and advanced treatment methods.At the same time,the microbial characteristics of secondary biological treatment in the process flow were analyzed,and the following conclusions were drawn:At the Phylum level,Proteobacteria had the highest relative abundance among all samples,responsible for the degradation of organic matter,nitrogen and phosphorus removal in wastewater.Its large presence ensured the normal operation of wastewater treatment plants;Actinbacteriota can utilize nitrate and ammonium salts,which were the most abundant in B2,with a relative abundance of 9.93%.At the Genus level,Pseudomonas and Acinetobacter were the most abundant in anaerobic reactor B1,which can degrade a large number of refractory substances.Volatile phenol,cyanide and sulfide had the highest degradation efficiency of more than 70%in the two aerobic reactors,which may be related to the highest proportion of 1013-28-CG33_Unclassified bacteria.B1 had the highest abundance of metabolic pathways for the biodegradation and metabolism of exogenous substances,indicating its strongest ability to metabolize organic matter.Compared with the microbial strains in the traditional AAO for domestic sewage treatment,the secondary biological treatment system for coking wastewater treatment had higher CODCr and ammonia nitrogen content in the influent and contained a large number of refractory substances,resulting in higher GAO bacteria,slightly lower PAO bacteria,increased denitrification and denitrification phosphorus removal bacteria,it had better organic matter degradation level and nitrogen removal effect of the overall process.