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.