PANCheng-rong,CHENJian,PENGShu-chuan,et al.Advanced Treatment Efficiency of Effluent from Wastewater Treatment Plant by Composite Constructed Wetland[J].China Water & Wastewater,2022,38(13):111-116.
Advanced Treatment Efficiency of Effluent from Wastewater Treatment Plant by Composite Constructed Wetland
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第13期
Page:
111-116
Column:
Date of publication:
2022-07-01
- Keywords:
- constructed wetland; effluent from wastewater treatment plant; advanced treatment; nitrogen removal
- Abstract:
- A composite constructed wetland process consisting of micro?aerated vertical flow wetland, horizontal subsurface flow wetland and submerged plant oxidation pond was applied to advanced treatment of the effluent from Zhongpai Wastewater Treatment Plant in Feixi County. When water temperature was 28.8 ℃, aeration rate and hydraulic retention time (HRT) of the micro-aerated vertical flow wetland were 0.3 m3/h and 0.12 d, HRT of the horizontal subsurface flow wetland with dosage of slow release carbon source was 1.30 d and HRT of the submerged plant oxidation pond was 1.60 d, the composite constructed wetland system had higher removal efficiencies of TN, TP and SS, which were 82.5%, 63.4% and 85.3%, respectively, and the submerged plant oxidation pond contributed to nitrogen removal. The average TN, COD and SS in effluent were 1.42 mg/L, 22.7 mg/L and 7.1 mg/L, respectively, which were better than the class Ⅳ criteria specified in Environmental Quality Standards for Surface Water (GB 3838-2002). The average NH4+-N in effluent was 0.2 mg/L, which met the class Ⅱ criteria specified in GB 3838-2002. The average TP in effluent was 0.15 mg/L, which was better than the class Ⅲ criteria specified in GB 3838-2002.
Last Update:
2022-07-01