Impact of a Sand Filtration Pretreatment Step on High-Loaded Greywater Treatment by an Electrocoagulation Technique

Greywater (GW) treatment by the electrocoagulation (EC) technique alone might not meet required standards in terms of pollutant removal, specifically when GW contains high loads pollutants. In this preliminary study, a sand filtration (SF) unit was integrated with EC as pretreatment step to enhance process for treating high-loaded GW. Three different voltage gradients were investigated (5 V/cm, 10 and 15 V/cm) unit. The results demonstrated that SF can contribute significantly reducing concentrations greywater be treated EC. physical impurities, showed reduced turbidity color 28.4%, 9.4%, respectively. COD concentration 25.5% step, which allowed reduction steady state time from 45 min 30 at an applied V/cm. addition, removal rate 87.8% high-load achieved energy consumption only 4.11 kWh/m3 comparison 6.21 without is equivalent 34% saving consumption.