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The article presents a study that determines the toxicity of the chemical industrial wastewater from Hangu reservoir in Tianjin, China. It notes the identification of various toxicans from the industrial wastewater that came from the aging chemical industrial plant, which was less biodegradable and has complex hazardous substances, affecting the local ecological services in Hangu reservoir and the safety of the nearby residents. It also mentions the two aspects of the treatment in the aging chemical industrial wastewater that aims to ensure the development of the government's Sino-Singapore Tianjin Eco-city collaboration project with Singapore, and the safety of the residents in the area.