Electrocoagulation and electroflotation of restaurant wastewater

A combined electrocoagulation and electroflotation process was applied to r estaurant wastewater treatment. The effects of operational variables on per formance were examined. The electrocoagulation and electroflotation charge loadings are the most important variables. In wide ranges, initial pH and c onductivity have no remarkable effects on pollutant removal. However, when pH is <4, suspended solids removal decreases sharply. The proposed techniqu e has two significant advantages: shorter retention time and lower water co ntent in the sludge produced. The power requirement is only 0.5 kW . h/m(3) under a set of typical operating conditions. The amount of dried sludge is 0.20-0.37 kg/kg chemical oxygen demand removed.