改性粉煤灰与厌氧-曝气生物滤池联合处理印染废水

The Treatment of Dyeing Wastewater With Fly Ash Modified Biological Aerated Filter Coupling

印染废水具有成分复杂、色度大、有机物含量高、水质变化大等特点,属于难生物降解工业废水。采用盐酸改性粉煤灰预处理与厌氧-曝气生物滤池（AF-BAF）联合工艺处理模拟印染废水,考察温度、pH、曝气量和HRT等因素对脱色率以及COD、NH4^＋-N、NO3^--N和NO2^--N去除率的影响。研究结果表明：在温度10℃,pH为10,曝气量为50 L/h,HRT为4 h,改性粉煤灰粒度为100-120目的条件下,COD、NH4^＋-N、NO3^--N和NO2^--N去除率分别为72%、58%、78%和52%,脱色率为90%,达到了国家工业废水排放标准。改性粉煤灰提高了AF-BAF对印染废水的脱色效果,同时对COD、NH4^＋-N、NO3^--N、NO2^--N的去除具有促进作用。

Dyeing wastewater,difficult to be biodegraded,is characterized by complicated component,dark colority,high concentration,water quality fluctuation,etc. Modified filter pretreatment of fly ash and anaerobic filter-biological aerated filter（ AF- BAF） is adopted to treat the dyeing wastewater to study the impacts of the facts such as temperature,p H,aeration,and HRT,etc on discoloration rate and the removal efficiency of COD、NH4^＋- N、NO3^-- N and NO2^-- N. The results showed that the removal efficiency of COD,NH4^＋- N,NO3^--N,and NO2^-- N were 72%,58%,78%,and 52%,respectively under the condition of temperature 10 ℃,p H10,aeration rate 50 L / h,HRT 4h and the modified fly ash particle size was 100- 120 mesh condition,the decolorization rate was 90%,reaching the national drainage standard for industrial waste water. The modified fly ash improved the decolorization of dyeing wastewater by AF- BAF,and promoted the removal of NH4^＋- N,NO3^-- N,NO2^-- N.