CHENGHan-yu,LIUHan-hu,JIANGXue-yang,et al.Performance of Hybrid Constructed Wetland for Mercury Removal in Effluent from the Secondary Biological Treatment System[J].China Water & Wastewater,2023,39(7):120-125.
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Performance of Hybrid Constructed Wetland for Mercury Removal in Effluent from the Secondary Biological Treatment System

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第7期 Page: 120-125 Column: Date of publication: 2023-04-01
Author(s):
CHENG　Han-yu1; 2; 3;  LIU　Han-hu2;  JIANG　Xue-yang4;  LUAN　Hui-jun2;  JIANG　Bin5; CHEN Shan-cheng1; 3
（1. Exploration Research Institute， Anhui Provincial Bureau of Geology， Hefei 230088， China； 2. School of Environment and Spatial Informatics， China University of Mining and Technology， Xuzhou 221116， China； 3. Green Mining Engineering Research Center of Anhui Province， Hefei 230088， China； 4. Lianyungang Economic and Technological Development Area Administration Committee， Lianyungang 222068， China； 5. Supply & Drainage Corporation in Xuecheng District， Zaozhuang City， Zaozhuang 277000， China）
Keywords:
hybrid constructed wetland;  horizontal subsurface flow constructed wetland;  surface flow constructed wetland;  mercury;  effluent from the secondary biological treatment system
Abstract:
The total mercury, dissolved mercury, particulate mercury and physicochemical indexes of effluent from the secondary biological treatment system of Xuecheng Wastewater Treatment Plant was tested to investigate the performance of hybrid constructed wetland system (horizontal subsurface flow constructed wetland and surface flow constructed wetland) for mercury removal. The mercury removal performance of the hybrid constructed wetland system was affected by temperature, dissolved oxygen and pH. The removal rate of total mercury was 96.47% in May, and the removal rate of surface flow constructed wetland was higher than that of horizontal subsurface flow constructed wetland. In September, the removal rate of total mercury was 97.58%, and the removal rate of horizontal subsurface flow constructed wetland was higher than that of surface flow constructed wetland. The total mercury concentration in effluent from the hybrid constructed wetland system was 1.90-3.59 ng/L, which met the requirement of Environmental Quality Standards for Surface Water (GB 3838-2002) class Ⅰ limit (no more than 50 ng/L). In conclusion, the hybrid constructed wetland system in Xuecheng can effectively remove exogenous mercury, which has important ecological value for ensuring the water quality safety of the eastern route of the South-to-North Water Diversion Project.
Last Update: 2023-04-01