Affiliation:
1. College of Ecological Environment and Urban Construction Fujian University of Technology Fuzhou China
2. Design and Research Institute of Secondary Artillery Beijing China
Abstract
Abstract
Aims
For upgrading and reconstructing a municipal wastewater treatment plant, a biofilm-microflocculation filter system was designed and established towards synergistic improvement of denitrification and phosphorus removal from the secondary effluent.
Methods and Results
The establishment of the biofilm-microflocculation filter system underwent several processes, including sludge inoculation, biofilm formation and polyaluminum chloride (PAC) addition as flocculating agent. Microbial community analysis indicated that the dominant denitrification bacteria of the biofilm filter were in the phylum Proteobacteria and the genera Hydrogenophaga and Dechloromonas. On the basis of the initiation of filter system under optimal parameters such as C/N ratio of 5.3, hydraulic retention time of 1.06 h and PAC of 5 mg L−1, approximately 75% COD, 80% TN and 75% TP could be effectively removed to satisfy discharge standards. Comparing the variations of microbial community structure at the genus level during the operating period of the filter system, it was found that the relative abundance of denitrification bacteria merely shifted from 53.14% to 48.76%, demonstrating that the effect of PAC addition on the main micro-organisms is marginal.
Conclusions
From the above results, it can be verified that the established biofilm-microflocculation filter system has practical and reliable performance for simultaneous biological denitrification and phosphorus removal.
Significance and Impact of the Study
This study provides a reference method for improving the advanced treatment of wastewater plant secondary effluent.
Funder
National Natural Science Foundation of China
Publisher
Oxford University Press (OUP)
Subject
Applied Microbiology and Biotechnology,General Medicine,Biotechnology
Reference24 articles.
1. Dechloromonas agitata gen. Nov., sp. nov. and Dechlorosoma suillum gen. Nov., sp. nov., two novel environmentally dominant (per) chlorate-reducing bacteria and their phylogenetic position;Achenbach;International Journal of Systematic and Evolutionary Microbiology,2001
2. An improved differential evolution method for efficient parameter estimation in biofilter modeling;Bhat;Biochemical Engineering Journal,2006
3. Biogeochemical activity of microbial biofilms in the water column overlying uranium mine tailings;Bondici;Journal of Applied Microbiology,2014
4. Nitrite production from partial-denitrification process fed with low carbon/nitrogen (C/N) domestic wastewater: performance, kinetics and microbial community;Cao;Chemical Engineering Journal,2017
5. Identification of diazotrophs in the culturable bacterial community associated with roots of lasiurus sindicus, a perennial grass of thar desert, India;Chowdhury;Microbial Ecology,2007
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