Landfill produces a leachate with incineration ash, which contains a considerable amount of inorganic matter (calcium and magnesium) and suspended solids are often larger than what is prescribed with such wastes. Reverse osmosis can be used to effectively treat these residual inorganic matter and suspended solids. However, the feasibility of reverse osmosis is limited by membrane fouling. In order to reduce the severity of membrane fouling caused by inorganic leachate, alkali coagulation-flocculation and alkali coagulation-membrane separation were examined in this work as pretreatment to reverse osmosis. Alkali coagulation-flocculation reduced calcium and magnesium by 97%. Also, the removal efficiency of COD was found to be from 88% to 97%.Alkali coagulation-membrane separation proved to be a more efficient pretreatment in terms of COD and turbidity removal than alkali coagulation-flocculation.
展开▼
