(cest2017_00328) Improving the Removal of Phosphate in Secondary Effluent of Domestic Wastewater Treatment Plant

摘要

World widely, the excess loads of phosphorus(P) is one of the most common chemical contamination infreshwater bodies (e.g. lakes, rivers). It is one of majorcauses of eutrophication. In the UK, 80% of 98 surveyedrivers were found to exceed the accepted standard ofhealthy rivers' P concentration, e.g. 0.1 mg/L. Effluentsfrom wastewater treatment plant (WWTP) are consideredto contribute up to 60-80% of the P in rivers due todischarge of treated effluents containing residual Pconcentrations of 1-2 mg/L. The discharge level of P fromWWTPs in many countries is going to be strictly limited to0.1 mg/L or even less due to the growing concern overeutrophication. Hence, the alternative technologies aresought to enhance the P removal efficiency from WWTPs.In this study, Ca and Mg incorporated layered doublehydroxide (LDH) adsorbents were synthesized andassessed for phosphate removal from both P spikedsynthetic solution and real effluent sample of WWTP. Theresults demonstrated that the effluent from WWTP'ssecondary treatment process with P concentration of 1.4-5.6 mg/L can be treated by both types of LDH to meetfuture stringent discharge limit at the level of 0.1 mg/L.