混凝沉淀/曝气生物滤池处理废旧塑料加工废水

Coagulating Sedimentation/BAF Process for Treatment of Waste Plastics Processing Wastewater

废旧塑料回收加工过程产生大量废水,其SS、COD、BOD5浓度均较高,但沉降性和可生化性较好,可以采用混凝沉淀/曝气生物滤池工艺处理,混凝剂PAC投量为200 mg/L,设计负荷为2.5 kgBOD5/(m3滤料.d)。运行结果表明,该处理工艺具有占地少、效率高、启动快、投资省、能耗低、运行管理方便等特点,在不加混凝剂的情况下出水水质达到《污水综合排放标准》(GB8978—1996)一级标准,加混凝剂后出水各项指标达到《生活杂用水水质标准》(CJ 25.1—89)。

COD and BOD5 A large amount of wastewater is produced during waste plastics processing. The SS, concentrations in the wastewater are higher, but its settle ability and biodegradability are good. The coagulating sedimentation/biological aerated filter process is used to treat this kind of wastewater. PAC dosage is 200 mg/L, design load is 2.5 kgBOD5/（ m^3 filtering medium · d）. The running result shows that this process has the characteristics of small land area occupied, high efficiency, rapid start-up, small investment, low energy consumption, convenient operation management etc. The effluent quality can meet the first class criteria specified in Integrated Wastewater Discharge Standard （ GB 8978 -1996） when coagulant is not added, and if coagulant is used, all indexes in the effluent can meet the requirements of Miscellaneous Domestic Wastewater Quality Standard（ CJ 25.1 - 1989 ）