Advanced Treatment of Alcohol Wastewater Using UF-RO Integrated Technology

Experiment was done for the advanced treatment of secondary effluent from alcohol wastewater by using UF-RO integrated technology.Effects of recovery of reverse osmosis(RO) membrane flux by different cleaning methods were studied,influence of different ultrafiltration membranes on wastewater treatment was discussed,and removal rate of pollutants were examined using UF-RO integrated technology.It appeared that ultrafiltration had good performance on removal of turbidity and organic matters with high molecular weight,which could guarantee good quality of feed water for reverse osmosis.The turbidity,total hardness and total iron for the effluent was no more than 0.1 NTU,0.03 mmol/L and 0.03 mg/L,and electrical conductivity was between 60 and 120 μS/cm,which could be directly used as boiler make-up water.The cleaning method of acid washing and alkali washing could effectively recover the membrane flux of reverse osmosis,with the membrane flux able to be recovered as 93.75% as raw water flux.