Purification effects of surface flow constructed wetland in treating polluted river water
ZHANG Zhichao1,2, WANG Shuqian1,2*
1.School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering, Handan, Hebei 056002, China; 2.Hebei Province Effective Utilization of Water Resource Engineer Research Center, Hebei University of Engineering, Handan, Hebei 056038, China
Abstract：To provide technical support for a demonstration project-efficient pollutant removal surface flow constructed wetland system, purification effects of the system on main pollutants such as nitrogen(TN)and ammonia nitrogen(NH+4-N)in Fuyang River were studied. A pilot experiment was carried out in Yongnian rainfall runoff test field of Handan at 430 mm/d hydraulic load with 0.5 d hydraulic retention time. The results showed that the system was subject to 51.89% and 47.00% avera-ge removal rates for TN and NH+4-N, respectively, exhibiting a good purification effect on polluted river water body. Based on the inflow water body quality during the trial, it turned out that the maximum working loads of the system were 8.95 mg/L and 2.16 mg/L for TN and NH+4-N, and the corresponding maximum removal rates were 60.00% and 56.48%, respectively. The TN and NH+4-N concentrations along the course were examined. It was identified that dissolved oxygen(DO)was one of the key factors influencing TN and NH+4-N removal, especially for NH+4-N removal. The trend of NH+4-N concentration slightly increases in the upper course, significantly decreases in the middle and gets stable in the tail end. The TN concentration showed a steadily decreasing trend along the course.
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