某焦化废水提标改造运行工艺研究

Research on the Operation Process of Upgrading and Transformation of Coking Wastewater

随着我国对节能环保行业的重视,芜湖新兴铸管有限责任公司焦化废水污水处理原工艺出水中仅有SS及硫化物浓度能够达到GB 16171—2012中主要指标的间接排放标准,已无法满足企业发展需求。经改造增加AS预处理曝气池和HOK生物流化床工艺后,主工艺变为AS预处理曝气池+厌氧池+缺氧池+好氧池+HOK生物流化床。运行6年的数据表明,该工艺能够有效降低进水中各污染物浓度,降低对好氧池中脱氮工艺冲击概率,同时HOK生物流化床相较于原芬顿催化氧化处理工艺对有机物污染去除率更高。改造后出水水质均能稳定达到排放标准,其中COD出水浓度均值为76.2 mg/L。

With the increasing emphasis on energy conservation and environmental protection in China,only the concentration of SS and sulfides in the effluent of the original coking wastewater treatment process of Wuhu Xinxing Ductile Iron Pipes Co.,Ltd.can meet the indirect emission standards of the main indicators in GB 16171—2012,which can no longer meet the development needs of the enterprise.After the transformation and addition of AS and HOK biological fluidized bed processes,the main process has been changed to AS pre-treatment aeration tank+anaerobic tank+anoxic tank+aerobic tank+HOK biological fluidized bed.The data from 5 years of operation shows that adding an AS pre-treatment aeration tank at the front end of the anaerobic tank can effectively reduce the concentration of various pollutants in the influent,reduce the probability of impact on the denitrification process in the aerobic tank,and at the same time,the HOK biological fluidized bed has a higher removal rate of organic matter pollution compared to the original Fenton catalytic oxidation treatment process.The effluent quality can consistently meet the discharge standards,with the average concentrations of COD being 76.2 mg/L.