厌氧-好氧生物流化床耦合处理N,N-二甲基乙酰胺废水的研究

摘要

湿法生产腈纶会产生含N,N-二甲基乙酰胺(DMAC)的废水,如果不加以处理会对环境造成危害.研究采用厌氧-好氧生物流化床耦合处理含DMAC模拟有机废水.废水中DMAC浓度为75.0 mg.L-1,化学需氧量(CODCr)浓度160.5 mg.L-1,葡萄糖、氯化铵为外加碳源、氮源,在CODCr/NH4+-N≤2、水力停留时间(HRT)14.9 h条件下处理废水,结果表明:NH4+-N的去除效率在CODCr/NH4+-N值为1时最高,达到81.9%;DMAC的去除效率随着CODCr/NH4+-N值降低而降低,在CODCr/NH4+-N值为2时,去除效率达到81.2%,在CODCr/NH4+-N降到0.5时,DMAC去除效率只有31.3%.当DMAC作为单一底物时,厌氧-好氧生物流化床耦合处理工艺对浓度为100.0 mg.L-1的DMAC废水去除效果较好,最高去除效率达到85.2%,出水水质达到《纺织染整工业水污染物排放标准》(GB4287-2012)的直接排放标准.%N,N-Dimethylacetamide (DMAC) is the main contaminant in wastewater from acrylic production, which causes environmental pollution without proper treatment. Experimental study on the treatment of simulated DMAC wastewater was investigated with an anaerobic-aerobic biological fluidized bed. The concentration of DMAC in simulated wastewater was 75.0 mg.L-1, and the chemical oxygen demand (CODCr) was 160.5 mg.L-1. Glucose and ammonium chloride were used as carbon source and nitrogen source, respectively. Under conditions of CODCr/NH4+-N ≤ 2 and hydraulic retention time (HRT) of 14.9 h, the experimental results show that the highest NH4+-N degradation percentage is 81.9% when CODCr/NH4+-N = 1. The average DMAC removal efficiency decreases when CODCr/NH4+-N decreases. The DMAC removal efficiency is 81.2% when CODCr/NH4+-N = 2, but it decreases to 31.3% when CODCr/NH4+-N = 0.5. In addition, when DMAC concentration in wastewater is 100.0 mg.L-1, the highest removal efficiency is 85.2% when using the anaerobic-aerobic biological fluidized bed without any external nitrogen or carbon sources. The water quality after treatment meets the standard of"Discharge standard of water pollutants for dyeing and finishing of textile industry"(GB4287-2012).