1. Key Laboratory of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055; 2. Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xian University of Architecture and Technology, Xi'an 710055
Abstract:The MBBR process formed by adding suspended fillers to the traditional activated sludge treatment system realizes the combination of the advantages of the suspended activated sludge and the biofilm. It is a cheap and efficient sewage treatment plant upgrading method. This article compares the effects of treatments of domestic sewage in different seasons, as well as the changes in the structure of the related flora in the sewage treatment system before and after the transformation of the Xi’an Fourth Sewage Treatment Plant. The results of the study show that the effluent quality of the treatment system after the upgrading transformation reached the first-level A standard, in which the concentration of ammonia nitrogen dropped by 0.44~1.29mg/L, the concentration of total nitrogen dropped by 4.93~5.60mg/L, and the and the COD removal rate reached more than 92%. Based on high-throughput analysis, the richness of the microorganisms related to denitrification in the system, and the diversity of the microorganisms both increased. The system had more than ten genus of bacteria related to denitrification, such as Phaeodactylibacter, Comamonas, Nitrospira, Terrimonas, Dokdonella, Thermomonas, Ignavibacterium, etc. In the MBBR process, Nitrospira was enriched in a large amount to 4.9%, and the proportion of denitrification-related bacteria reached 19.29%, which effectively promoted the system's denitrification.
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