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The coking plant of Xingang company is the largest coal coke chemical production base in Jiangxi Province, with an annual output of 2.6 million tons of coke. The coking wastewater treatment system in the plant mainly adopts aerobic facultative aerobic technology, supplemented by physical and chemical treatment technologies such as coagulation and air flotation, and then deep decolorization treatment by our company. After years of operation, the pollutants in the coking external drainage have reached The first level discharge standard in the discharge standard of water pollutants for iron and steel industry. Now, due to the influent pollutants and the impact of temperature exceeding the standard, the primary aerobic system is basically paralyzed, and the initial aeration tank SV30 basically does not play its role in preliminary treatment, so it is necessary to re Commission the cultured sludge. Now it is decided that the commissioning is completely completed by Guochang company.