MBR工艺处理粮油加工废水的研究

采用MBR(Membrane Bioreactor)工艺对粮油加工废水进行处理发现,污染物的去除是活性污泥和膜截留共同作用的结果,试验中微生物的去除作用占污染物总去除率的62.9%~88.1%,起主要作用。当系统的污泥负荷和容积负荷分别在0.4~0.54 kgCOD/kgMLSS.d之间和3.8~5.0 kgCOD/m3.d之间变化时,系统对COD的去除率在92.5%以上。本试验所用膜的临界膜通量为8~10 L/(m2.h),系统污泥浓度从1~2g/L增加到10~12g/L时,临界膜通量从10~12L/(m2.h)下降到了3~4 L/(m2.h),随着膜面流速从1.0m/s上升到1.8m/s,膜的临界通量也相应的从4~6 L/(m2.h)上升到了16~18 L/(m2.h),呈正相关。

Study on Treatment of Food Processing Wastewater Using MBR

MBR technology was adopted to treat the wastewater from the cereals and oils processing.It was found that the effect of pollutants removal resulted from both actions of activated sludge and membrane intercepting,of which the microorganism played a dominant role of decontamination,accounting for 62.9%~88.1% of the total removal.When the sludge loading and volume loading were 0.4~0.54 kg COD/kg MLSS·d and 3.8~5.0 kg COD/m3·d respectively,the system removal rate of COD was more than 92.5%.In the experiment the critical flux of the membrane was 8~10 L/（m2·h）.When the concentration of sludge increased from 1~2g/L to 10~12g/L,the critical flux decreased from 10~12L/（m2·h） to 3~4 L/（m2·h）.When the surficial velocity increased from 1.0m/s to 1.8m/s,the critical flux increased from 4~6 L/（m2·h） to 16~18 L/（m2·h） correspondingly,being a positive correlation between them.