BAF在印染废水深度处理的试验研究

STUDY OF BAF FOR DYEING WASTEWATER ADVANCED TREATMENT

利用上向流陶粒滤料BAF反应器深度处理印染废水,采用分步挂膜法启动并经160d的稳定运行,在低B/C和营养物质条件下,考察了BAF对COD、NH3-N的去除效果。结果表明,当气水体积比在5:1,水力负荷为0.5m·3m-·2h-1时,COD的去除率可达51.3%～56.5%,同时NH3-N的去除率也保持在86.5%～93.7%,主要降解产物为NO3--N,TN基本没有降解,出水COD保持在39.6～45.3mg·L-1,出水NH3-N质量浓度保持在0.11～0.24mg·L-1。GC-MS分析结果表明,废水中主要的难降解有机物包括丁羟甲苯、柏木烷、邻苯二甲酸脂类以及少量长链烷烃,BAF对以上有机物均有一定的降解效果,但主要有机物丁羟甲苯和柏木烷的残留率仍有65.0%和39.2%。

An up-flow ceramsite media biological aerated filter（BAF） was used for dyeing wastewater advanced treatment. Twice start-up method was employed and then the BAF reactorhad been operated steadily for160 days, while the removal efficency of COD and NH3-N was investigated on the condition of low B/C value and lacking of nutrients. Results showed that the reactorachieved mean degradation efficiency of 51.3%～56.5%forCOD and 86.5%～93.7%forNH3-N when the air/waterratio was 5：1 and hydraulic loading was 0.5 m3·m-2·h-1. The total nitrogen（TN） in this study showed slight degradation and the NO3--N was the major degradation production.The concentration of COD and NH3-N in the effluent was 39.6～45.3 mg·L-1 and 0.11～0.24 mg·L-1, respectively. The GC-MS showed that the pollutants in wastewater included butylated hydroxytoluene, cedrol, phthalic acid, and alkanes with a straight chain form nine to twenty seven. All the pollutants were bilological degraded in BAF, but the major pollutants such as butylated hydroxytoluene and cedrol still had 65.0%and 39.2%retention.