KOU Xiao-mei,WU Shi-zhang,SHAO Tian,et al.Winter Start-up and Spring Operation of Hybrid Constructed Wetland for Domestic Sewage Treatment[J].China Water & Wastewater,2021,37(17 17):69-73.
Winter Start-up and Spring Operation of Hybrid Constructed Wetland for Domestic Sewage Treatment
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
17 17
Page:
69-73
Column:
Date of publication:
2021-09-01
- Keywords:
- hybrid constructed wetland; winter start-up; spring operation; enhanced aeration; plant growth
- Abstract:
- The winter start-up and spring operation of a hybrid constructed wetland (HCW) consisted of a vertical flow constructed wetland (VFCW) and a horizontal flow constructed wetland (HFCW) fed domestic sewage from a northern town was investigated. Meanwhile, the effects of enhanced aeration on pollutant removal and plants growth of the HCW during winter start-up and spring operation were explored by changing the aeration conditions at low temperature. During the cold start-up stage in winter and the operation stage in spring, aeration obviously increased the dissolved oxygen in the HCW system, so as to improve the removal performance of COD, SS, TN, NH4+-N and TP in the domestic sewage. In addition, tillering did not stop and plant height continued to increase in the HCW system even at low air temperature of (0.3±2.4) ℃ and water temperature of (7.25±2.7) ℃. Therefore, the start-up of HCW system was not affected by low temperature in winter as showed by the changes of tillering and plant height. During the operation of the HCW system in spring, the SS and COD in the effluent reached the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918－2002), and the NH4+-N and TN in the effluent were (6.81±1.01) mg/L and (15.48±1.34) mg/L, respectively.
Last Update:
2021-09-01