Chlorination is widely used for preventing biofouling in power plant cooling water systems.Recent research has indicated that chlorine sourced from the cooling water of power plant is one of the major harmful factors which damage adjacent water ecosystem.In this paper,the technology and research progress on the utilization of chlorine in the cooling water of enterprises and harmful effects of the residual chlorine on phytoplankton,zooplankton,fish and shellfish,etc.were reviewed.Though 0.2 mg L~(-1) chlorin...