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

摘要

The removal of algae and odorous metabolite dimethyl trisulfide (DMTS) in water using potassium ferrate (K_2FeO_4) was investigated. The treatment effect was compared with poly-ferric chloride (PFC) and potassium permanganate (KMnO_4) pre-oxidation followed by PFC. Factors such as pH, oxidation contact time, and turbidity were also analyzed. The results show that K_2FeO_4 is 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 K_2FeO_4 is better than pre-oxidized KMnO_4, with decreased oxidation contact time. The removal ratio of DMTS by K_2FeO_4 was 92.5% with contact time set to 1 min; in comparison, KMnO_4 had a removal ratio of only 74.6% after 10 min of contact.