... sulfate are widely used in drinking water, industrial water, all kinds of industrial waste water, city sewage and sludge dewatering of ... flocculant polymerization ferric sulfate purification effect is good, good water quality, do not contain the aluminum, chlorine and heavy ... oil, dehydration, degerming, deodorization and algae, remove the water COD, BOD and heavy metal ions, such as effectiveness ...