膜蒸馏处理焦化废水生化出水的实验研究

he advanced treatment of biologically treated coking wastewater was studied using direct contact membrane distillation system. After the system operating 8h, the water quality, initial flux and thermal efficiency were analyzed at different flow rates (0.1-0.5m/s)(hot side inlet temperature 40oC, cold side inlet temperature 20oC). The results show that the thermal efficiency showed a trend of first increase and then decrease with the increasing of flow rate, the optimal flow rate is 0.3m/s. Under this operating condition, the initial flux was 11.28 kgom-2oh-1, the thermal efficiency was 19.9%, the main pollutant index of the permeate effluent, such as COD, color, conductivity and ammonia was 6.5 mg/L, 1 , 27.0 us/cm, 1.08 mg/L, respectively. All can meet the water-quality standard of reuse water. The change of the flux and membrane fouling at different flow rates were also investigated. Result of this study showed that increasing the flow rate can slow membrane fouling.