摘要
以微污染河道水为处理对象,研究了砾间接触氧化/水平潜流人工湿地复合工艺对水质的净化效果。经过26 d改变进水配比、曝气方式等的调控运行,成功启动复合工艺模拟装置,砾间接触氧化区(简称砾石区)的COD、NH4^(+)-N去除率均稳定在75%左右,TN去除率在45%~60%。为进一步强化净化效果,探讨了砾石区水力停留时间(HRT)和砾石曝气区与非曝气区(O/A)分段进水配比对砾石区及后置潜流人工湿地出水水质的影响。当砾石区HRT为5 h时,砾石区对污染物的去除效果较好,COD、NH4^(+)-N、TN平均去除率分别可达72%左右、75.28%、67.79%,人工湿地对三者的去除率分别为31%、43%、28%;当O/A区分段进水配比为1∶1时,对COD、NH4^(+)-N的平均去除率较高,分别为77.39%和84.91%,分段进水配比为1∶2时,对TN的去除率最高,达到68.5%,人工湿地对TN的去除率为24.47%。因此,砾石区HRT为5 h为较佳参数,分段进水配比可根据进水污染状况灵活选择,研究结果可为实际工程应用提供理论支撑。
Purification effect of micro-polluted river water by a hybrid process of gravel contact oxidation and subsurface flow constructed wetland was investigated.After 26 days of regulation and operation by changing the influent distribution ratio and aeration mode,the hybrid process simulation device was successfully started.The removal efficiencies of COD and NH4^(+)-N in the gravel contact oxidation zone(gravel zone for short)were both stable at about 75%,and the TN removal efficiency was 45%-60%.In order to further enhance the purification efficiency,influences of gravel zone hydraulic retention time(HRT),influent distribution ratio between the gravel aeration zone and nonaeration zone(O/A)on effluent quality of the gravel zone and subsurface flow constructed wetland were discussed.When HRT of gravel zone was 5 h,the gravel zone had a good removal effect on pollutants,in which the average removal efficiencies of COD,NH4^(+)-N,and TN could reach about 72%,75.28%and 67.79%,respectively.And the removal rates of constructed wetland were 31%,43%and 28%,respectively.When influent distribution ratio between the aeration zone and non-aeration zone was 1∶1,the average removal efficiencies of COD and NH4^(+)-N were higher,which were 77.39%and 84.91%,respectively.When the influent distribution ratio was 1∶2,the maximum removal efficiency of TN was obtained,which was 68.5%,and the removal rate of TN in constructed wetland was 24.47%.Consequently,HRT of 5 h was chosen as the optimal parameter,and influent distribution ratio could be flexibly selected according to different water pollution status.The results can provide theoretical support for practical engineering applications.
作者
蒋宇豪
李敏
唐明哲
滕泽栋
JIANG Yu-hao;LI Min;TANG Ming-zhe;TENG Ze-dong(College of Environmental Science&Engineering,Beijing Forestry University,Beijing 100083,China;Henan Provincial Communications Planning&Design Institute Co.Ltd.,Zhengzhou 450000,China;Beijing Municipal Research Institute of Environmental Protection,Beijing 100037,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2021年第5期57-65,共9页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2017ZX07108-002)。
关键词
砾间接触氧化
潜流人工湿地
微污染
水力停留时间
分段进水配比
gravel contact oxidation
subsurface flow constructed wetland
micro-pollution
HRT
influent distribution ratio
