The phenol cyanide wastewater station of Jiangsu Lihuai Iron and Steel Co., Ltd. is located in the courtyard of Huai Iron and Steel Co., LTD., Qingjiangpu District, Huai 'an City, Jiangsu province. The sewage plant mainly accepts ammonia steam wastewater from the coking plant, gas water sealing water from the company's pipeline network and coke quenching pond water, etc. 45m3/h. The wastewater treatment adopts the "pretreatment + biochemical treatment" process to ensure the effective treatment and standard reuse of wastewater. The treated purified water is discharged to the steel plant to wash slag, basically achieving "0 discharge".