Preparation of a Novel Flocculant-Polyferric Magnesium Sulfate and its Application in Wastewater Treatment

Abstract

As a fundamental technique of environmental protection, coagulation has been used in the treatment of water and wastewater. In this work, a new type of coagulant, polyferric magnesium sulfate, was synthesized by co-polymerization. The effects of Mg/Fe molar ratio (n), temperature and the dosage of oxidant on coagulation performance were investigated systematically. The results showed that polyferric magnesium sulfate had an improved property of charge-neutralization in a kaolin (clay) suspension or municipal wastewater due to the magnesium ions. Additionally, polyferric magnesium sulfate exhibited a better coagulation performance than the conventional polymeric coagulants (e.g., polyaluminum chloride and polyferric sulfate).