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Risk of Reclaimed Water Chlorination 1.1 Challenge for chlorination How to balance pathogen inactivation and byproduct control is the primary contradiction in reclaimed water disinfection 1.2 Characteristics of reclaimed water disinfection Pollutants in reclaimed water:Many types,very complex 1.3 Importance of bio-toxicity tests ·Many DBPs are unidentified or uncharacterized by existing chemistry analysis technics.·Toxicities of many DBPs remain unknown.·Mixture effects of DBPs toxicity are complex.Bio-toxicity tests are more comprehensive and intuitionistic for evaluating risks induced by DBPs.