Simultaneous removal of algae and its odor metabolites in raw water by potassium ferrate

The removal of algae and odorous metabolite dimethyl trisulfide (DMTS) in water using potassium ferrate (K2FeO4) was investigated. The treatment effect was compared with polyferric chloride (PFC) and potassium permanganate (KMnO4) pre-oxidation followed by PFC. Factors such as pH, oxidation contact time, and turbidity were also analyzed. The results show that K2FeO4is more effective in algae elimination than PFC, with a higher removal ratio of 92.4% when dosage is equivalently measured by Fe. Removal of DMTS by K2FeO4is better than pre-oxidized KMnO4, with decreased oxidation contact time. The removal ratio of DMTS by K2FeO4was 92.5% with contact time set to 1 min; in comparison, KMnO4had a removal ratio of only 74.6% after 10 min of contact.