Performance of constructed wetlands with different substrates for the treated effluent from municipal sewage plants

Author:

Shiwei Cao1,Zhaoqian Jing1,Peng Yuan1,Yue Wang1,Yin Wang1

Affiliation:

1. College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China

Abstract

Abstract Constructed wetlands (CWs) are effective as an advanced treatment process for the treated effluent of municipal wastewater plants. An appropriate substrate, suitable macrophytes, and proper operation are crucial for pollutant abatement. In this research, three subsurface flow CWs with various substrates were investigated. Pollutants abatement efficiency under various operational schemes were analyzed. The results showed that the satisfactory hydraulic loading rate was 0.25 m3/(m2·d). When the C/N ratio of influent was adjusted to 5.87 by adding a carbon source, the denitrification and dephosphorization efficiency would be improved, with 7–8 mg/L for total nitrogen (TN) and 0.4 mg/L for total phosphorus (TP) in the effluent, which can achieve the Class 1A Discharge Standard for discharge to natural waterways in China. A greater depth of submersion for the substrate layer resulted in a more conducive environment for the abatement of nitrogen substances. However, a 40-cm depth of submersion in CWs results in better removal efficiency of TN and TP. A plastic ring substrate (PRS) contains biological enzyme promoter formula, which was conducive to nitrifying and denitrifying bacteria. The biofilm affinity and coordination with plants made the PRS more effective than the other two substrates, especially for NO3–-N and TN abatement efficiency.

Funder

China National science and technology support program

Science and technology project of ministry of housing and urban-rural development of China

Publisher

IWA Publishing

Subject

Filtration and Separation,Water Science and Technology

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