Long term operation of continuous-flow system with enhanced biological phosphorus removal granules at different COD loading.
In this study, a continuous-flow system with enhanced biological phosphorus removal (EBPR) granules was operated at different COD concentrations (200, 300 and 400mgL(-)(1)) to investigate the effect of COD loading on this system. The results showed that when the COD concentration in influent was increased to 400mgL(-)(1), the anaerobic COD removal efficiency and total phosphorus removal efficiency reduced obviously and the settling ability of granules deteriorated due to the proliferation of filamentous bacteria. Moreover, high COD loading inhibited the EPS secretion and destroyed the stability of granules. Results of high-through pyrosequencing indicated that filamentous bacteria had a competitive advantage over polyphosphate-accumulating organisms (PAOs) at high COD loading. The performance of system, settling ability of granules and proportion of PAOs gradually recovered to the initial level after the COD concentration was reduced to 200mgL(-)(1) on day 81.
Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100123, China. Electronic address: lidong2006@bjut.edu.cn.
Dong
D
Li
Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100123, China.
Yufeng
Y
Lv
Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100123, China.
Huiping
H
Zeng
Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100123, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Jie
J
Zhang
D001419:Bacteria / Q000235:genetics; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D059014:High-Throughput Nucleotide Sequencing; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000302:isolation & purification*; D011134:Polysaccharides / Q000032:analysis; D011506:Proteins / Q000032:analysis; D012212:Rheology / Q000379:methods*; D012722:Sewage / Q000737:chemistry*; D013696:Temperature
D011134:Polysaccharides; D011506:Proteins; D012722:Sewage; D010758:Phosphorus; D009584:Nitrogen
COD loading; Continuous-flow system; EBPR granules; High-throughput pyrosequencing; Recoverability