Research On Toxicity Identification And Reduction Technology For Petrochemical Industrial Drainage

China is not only facing Water environment eutrophication and oxygen consumption of organic pollution which be caused by traditional pollutants, but also facing the serious challenges of toxic pollutants. As the presence of these toxic substances, it makes ecological security and water security serious threat, so establishment of a complete eco-toxicity evaluation methods, toxic identification and reduction measures are highly valued by countries.This article draws toxicity identification evaluation technology developed by the U.S. EPA (TIE). Starting directly from the raw materials and process of the production, with main quality indicators of wastewater a toxicity identification operation process is developed. In accordance with toxic identification operation process for Ethylene industrial wastewater of a petrochemical plant for toxicity testing,it has be found that benzene and sulfur compounds in wastewater to Daphnia magna have significantly toxicity. Among them, benzene is key.The 24 h-LC50 mean of wastewater to Daphnia magna is 53.68%, the content of benzene is about 30 mg/LWith identifying the key toxic Benzene and Sulfides,effluent toxicity reduction about raw materials, equipment,operation process,wastewater treatment technology etc. of ethylene industry is discussed.It has be found that grease traps,homogeneous,flotation,biological treatment, advanced treatment etc. treatment processes can well reduce the acute toxicity of wastewater which is generated from ethylene plant,downstream polyethylene plan (PE),polypropylene plant (PP),ethylbenzene/styrene plant (EB/SM) and polystyrene plant (PS).Wastewater treated by flotation has not generated 24 h acute toxicity for Daphnia magna,and wastewater treated by biological can achieve discharge standards in Guangdong Province (second periods),and wastewater in the depth of treated can achieve the requirements of the plant reuse water.