| The characteristics of Acrylic fiber wastewater are complex component, unstable water quality, biodegradability of the poor and toxic and harmful.Biofilm anaerobic biological contact oxidation process is used to treat the Acrylic fiber wastewater in the experiment. The influence of Hydraulic retention time and sludge concentration, BOD5, nitrification liquid back to flow, extra carbon sources and dissolved oxygen on the process were studied.The first thing is sludge acclimation.After 5 days the sludge was moved to the reactor to start experiments. After four weeks, Biofilm grow well, Anti-bma is very normal, the concentration of COD in the effluent remained stablely and the removal rate of COD is about 40%.Then biofilm formed in the main.The startup of the reactor was completed and the experiment can be started.The concentration of COD,BOD5,NH3-N,TN,acrylonitrile and DMAC in the raw water was respectively 500mg/L to 850mg/L,300mg/L to 450mg/L,60mg/L to 100mg/L,170mg/L to 240mg/L,0.9mg/L to12.2mg/L and 4.5mg/L to 59mg/L. The treatment effects of acrylic fiber wastewater under the conditions of different influential factors were studied. The results showed that when the hydraulic retention time is 20h, the concentration of sludge is 15.98g/L and the concentration of DO is 3.5mg/L, the effect of COD and BOD5 is the best and the removal rate are respectively up to 65.8% and 90.4%; When the reflux ratio is 200% and the concentration of dosing NaHCO3 is 0.5g/L, the removal rate of TN and NH3-N are respectively 35.5% and 25.1%. Under different operation conditions the removal rate of the feature pollutants DMAC (Dimethylacetamide) and acrylonitrile can close to 100%.
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