YAN Fei-long,WANG Yi,WANG Wen-huai,et al.Effect of Aeration Mode on Treatment of Urban Domestic Sewage by Hybrid Constructed Wetland[J].China Water & Wastewater,2021,37(19 19):85-90.
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Effect of Aeration Mode on Treatment of Urban Domestic Sewage by Hybrid Constructed Wetland

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 19 19 Page: 85-90 Column: Date of publication: 2021-10-01
Author(s):
YAN Fei-long1; WANG Yi1; WANG Wen-huai1; ZHANG Heng1; KOU Xiao-mei2; WU Shi-zhang2; SHAO Tian2; NIU Le2
(1. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2. PowerChina Northwest Engineering Corporation Limited, Xi’an 710065, China)
Keywords:
hybrid constructed wetland; urban domestic sewage; continuous aeration; intermittent aeration; high-efficiency area; water quality improvement area
Abstract:
There is a problem of poor carbon and nitrogen removal efficiency caused by insufficient oxygen supply when the domestic sewage is directly treated by the constructed wetland. A hybrid constructed wetland (HCW) was built by combining a vertical-flow constructed wetland (VFCW) and a horizontal-flow constructed wetland (HFCW). Moreover, the effect of aeration mode on the treatment of urban domestic sewage by the HCW was explored, and the purification mechanism of the pollutants in the HCW system was analyzed. When the HLR and gas-water ratio were 0.094 5 m3/(m2·d) and 6.5 ∶1, both the continuous aeration and intermittent aeration could achieve better removal performances of the domestic sewage in the HCW system. Compared with the continuous aeration, the intermittent aeration was more conducive to TN removal in the HCW system, and COD, SS, TN and NH4+-N in the effluent could stably reach the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002). The variations in pollutant concentrations along the HCW system indicated that the upper part of the VFCW belonged to the high-efficiency area of the HCW system and could remove most of the pollutants in the domestic sewage. The other areas of the HCW system served as the water quality improvement areas, which further purified the pollutants in the system, thus ensuring the efficient and stable treatment of the urban domestic sewage by the HCW.
Last Update: 2021-10-01