Title: Domestic wastewater treatment with CEPT-wetlands process

Authors: Yaqiang Li, Feng Tang, Qingliang Zhao, Kai Hu

Addresses: Sate Key Lab of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 202 Haihe Road, Nangang District, Harbin 150090, China. ' Sate Key Lab of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 202 Haihe Road, Nangang District, Harbin 150090, China. ' Sate Key Lab of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 202 Haihe Road, Nangang District, Harbin 150090, China. ' Sate Key Lab of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 202 Haihe Road, Nangang District, Harbin 150090, China

Abstract: This study aimed to develop an effective process with less construction and operation cost and with flexibility of meeting different temperature requirements, namely CEPT-construted wetland processes. To reduce the chemical cost for the CEPT process, fly ash was firstly utilised to develop an efficient compound coagulant. The lab-scale experimental results showed that with low Fly Ash Coagulant (FAC) dosage the removals of COD, Total Phosphorus (TP) and Suspended soild (SS) could achieve more than 62%, 91% and 93%, respectively. The coagulation effluent TP and SS had already met the level IB of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002). When the effluent was further treated by following wetlands system with a HRT 2–4 d, the COD could be removed up to 65-77% with the final effluent COD less than 64 mg/L.

Keywords: domestic wastewater; chemically enhanced primary treatment; CEPT; constructed wetlands; FAC; fly ash coagulant; wastewater treatment; water pollution.

DOI: 10.1504/IJEP.2011.039095

International Journal of Environment and Pollution, 2011 Vol.45 No.1/2/3, pp.186 - 196

Available online: 16 Mar 2011 *

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