TY - JOUR
T1 - Application of light-weight filtration media in an anoxic biofilter for nitrate removal from micro-polluted surface water
AU - Wang, Zheng
AU - Fei, Xiang
AU - He, Shengbing
AU - Huang, Jungchen
AU - Zhou, Weili
N1 - Funding Information:
The study was supported by The National Natural Science Foundation of China (51378306); The Program for Chinese National Key Projects of Water Pollution Control and Reclamation (2012ZX07101-007); and Shanghai Jiaotong University 'Chenxing Plan (SMC-B)'.
Publisher Copyright:
© IWA Publishing 2016.
PY - 2016/8
Y1 - 2016/8
N2 - The research investigated nitrate removal from micro-polluted surface water by the single-stage process of anoxic biofilter using light-weight polystyrene beads as filtration media. In this study, sodium acetate was used as an external carbon source and the nitrate removal efficiency under different regimes of hydraulic loading rate (HLR), water temperature, and C/N ratio was studied. In addition, the effect of backwash on denitrification efficiency was investigated. The results show that the biofilter achieved a high nitrate removal efficiency in 2 weeks at water temperatures ranging between 22 and 25 WC at a C/N ratio (COD:NO3- -N) of 6:1. Besides, the average removal efficiency of nitrate at HLRs of 5.66, 7.07 and 8.49 m3 m-2 h-1 were 87.5, 87.3 and 87.1%, respectively. The average removal efficiency of nitrate nitrogen was 13.9% at a HLR of 5.66 m3 m-2 h-1 at water temperatures of 12-14 WC, then it increased to 93.7% when the C/N ratio increased to 10. It suggests that the optimal hydraulic retention time is at water temperatures of 8-10 WC. The water consumption rate of backwash was about 0.2-0.3%, and denitrification efficiency returned to the normal level in 12 h after backwash.
AB - The research investigated nitrate removal from micro-polluted surface water by the single-stage process of anoxic biofilter using light-weight polystyrene beads as filtration media. In this study, sodium acetate was used as an external carbon source and the nitrate removal efficiency under different regimes of hydraulic loading rate (HLR), water temperature, and C/N ratio was studied. In addition, the effect of backwash on denitrification efficiency was investigated. The results show that the biofilter achieved a high nitrate removal efficiency in 2 weeks at water temperatures ranging between 22 and 25 WC at a C/N ratio (COD:NO3- -N) of 6:1. Besides, the average removal efficiency of nitrate at HLRs of 5.66, 7.07 and 8.49 m3 m-2 h-1 were 87.5, 87.3 and 87.1%, respectively. The average removal efficiency of nitrate nitrogen was 13.9% at a HLR of 5.66 m3 m-2 h-1 at water temperatures of 12-14 WC, then it increased to 93.7% when the C/N ratio increased to 10. It suggests that the optimal hydraulic retention time is at water temperatures of 8-10 WC. The water consumption rate of backwash was about 0.2-0.3%, and denitrification efficiency returned to the normal level in 12 h after backwash.
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U2 - 10.2166/wst.2016.299
DO - 10.2166/wst.2016.299
M3 - Article
C2 - 27533875
AN - SCOPUS:84982126519
SN - 0273-1223
VL - 74
SP - 1016
EP - 1024
JO - Water Science and Technology
JF - Water Science and Technology
IS - 4
ER -