Performance Evaluation of the Horizontal Subsurface Flow Constructed Wetland with Ipomoea aquaticaplantfor Rural Domestic Wastewater Treatment

摘要

In this study, the performance treatment of horizontal subsurface flow constructed wetland (HSFCW)was evaluated.The HSFCW built as a tertiarytreatment process after the biological reactors to improve the effluent quality.The HSFCW system was operated with different hydraulic loading rates(HLRs) rang ed from 0.15 to 0.333 m~3/ (m~2.d)to assess their influence on removal efficiency. During the system operation time, the average temperature was ranged of 22.3 to 31.2 °C and pH ranges was 7.3 -8.1. The Ipomoea aquatica(Chinese spinach) planted into HSFCW system and the growth parameters during the experimental operationobserved. The Ipomoea aquatica growth parameters such as the plant height, a fresh and dry weights were monitored and measured. The influent and effluent of chemical oxygen demand (COD), ammonium nitrogen (NH4-N), total nitrogen (TN) and total phosphorus (TP) were examined.The removal efficiency for all parameters showed decreased with an increase in HLR from 0.15 to 0.333 m~3/ (m~2.day).The results demonstrated that the average removal efficiency of the COD, NH4-N, TN and TP during system operation is 52.9%, 64.6%, 58.2% and 72.8% respectively.These results confirm that the HSFCW has a good efficient in treatment and can be used for the nutrients and organic matter removal from the domestic wastewater.