Optimized hydraulic retention time for phosphorus and COD removal from synthetic domestic sewage with granules in a continuous-flow reactor.
In continuous-flow reactor (CFR), suboptimal hydraulic retention time (HRT) can affect the substrate loading, anaerobic time and aerobic time and further affect the performance and characteristics of granules, thus different HRTs (7.5, 6.0, 4.5 and 5.2h) were tested to improve the phosphorus (P) and carbon (COD) removal of the continuous-flow system with granules in this study. When HRT was below 6.0h, the COD removal efficiency in anaerobic zone and the P removal efficiency in aerobic zone reduced obviously, and the settling ability of EBPR granules deteriorated. The residual COD in anaerobic zone resulted in the proliferation of filamentous bacteria on the granules surface. Pyrosequencing analysis revealed that Proteobacteria was the dominant phylum in this system. The dominant class transformed from Betaproteobacteria to Gammaproteobacteria when HRT was reduced from 6.0h to 4.5h.
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.
Meizhong
M
Cao
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
D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D010758:Phosphorus / Q000737:chemistry / Q000302:isolation & purification; D020560:Proteobacteria; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
D012722:Sewage; D010758:Phosphorus
Biological phosphorus removal; Continuous-flow reactor; Granules; High-throughput pyrosequencing; Optimal hydraulic retention time