Inorganic Polymer Flocculant Polyferric Chloride, Its Properties, Efficiency and Production

This paper summarizes a series of research projects in State Key Laboratory of Environmental Aquatic Chemistry (SKLEAC).The chemical species in polyferric solutions were examined by timed complexation spectrophotometry to classify them as Fe _a , Fe _b and Fe _c . The hydrolysity B* taken as a principal parameter is emphasized. The classification and evolution patterns of hydrolyzed Fe(III) solutions are examined.Short term precipitation in polyferric chloride solutions can be retarded by addition of a sort of phosphate stabilizer which contributes to this flocculant both a commercial possibility and a higher efficiency.To examine the reuse of municipal waste water, besides jar tests in the laboratory, pilot tests of advanced treatment after the biological oxidation process were carried out. The polyferric chloride flocculant was used and compared with other coagulants. A high efficiency of removal of turbidity and color was obtained.