LI Li,SHEN Tong,ZHAO Zhi-wei,et al.Treatment of Domestic Sewage with Low C/N Ratio in Tropical Offshore Islands by Flowseparated Biochemical Technology[J].China Water & Wastewater,2021,37(23 23):88-94.
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Treatment of Domestic Sewage with Low C/N Ratio in Tropical Offshore Islands by Flowseparated Biochemical Technology

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 23 23 Page: 88-94 Column: Date of publication: 2021-12-01
Author(s):
LI Li1; SHEN Tong2; ZHAO Zhi-wei1; ZHANG Ping3; LI Zi-chen1; ZENG Xian-peng1; GENG Cong1; LIANG Zhi-jie1
(1. College of Environment and Ecology, Chongqing University, Chongqing 400045, China； 2. Special Engineering Construction Office of Naval Logistics Department， Beijing 100841， China； 3. 91053 PLA Troops, Beijing 100070, China)
Keywords:
flow-separated biochemical technology; low C/N ratio; nitrogen and phosphorus removal; island; domestic sewage
Abstract:
Quality and discharge characteristics of domestic sewage in tropical offshore islands differ greatly from those in cities, as it has higher contents of nitrogen and phosphorus and a lower C/N ratio. To further improve the efficiency of flow-separated biochemical technology in the treatment of high concentration domestic sewage in tropical offshore islands, the operational performance of the process was analyzed combined with an engineering project, the problems existing in the actual operation were analyzed, and the corresponding improvement measures were proposed. When the average C/N ratio and C/P ratio of the influent were 6.1 and 58, and the average COD, ammonia nitrogen, TN and TP in the influent were 441 mg/L, 62.65 mg/L, 72.56 mg/L and 7.80 mg/L, respectively, the average removal efficiencies were 87.9%, 90.9%, 54.8% and 14.9%, respectively. The flow-separated biochemical technology maintained high removal efficiencies of COD and ammonia nitrogen, and had certain TN removal efficiency and a poor TP removal efficiency, indicating that the removal efficiency of nitrogen and phosphorus by the flow-separated biochemical technology was poor. To ensure the nitrogen and phosphorus removal efficiency of the biochemical system, it is recommended to stop regulating tank aeration, adopt multipoint feeding and stage controlled aeration, set backwashing systems for forced sludge discharge and adopt chemical dephosphorization.
Last Update: 2021-12-01