Treatment of saccharin wastewater by membrane distillation
膜蒸馏处理糖精钠生产废水

Direct contact membrane distillation(DCMD) was used for the treatment of saccharin wastewater.Membrane distillation experiments with wastewater before and after adsorption as feed were carried out,respectively.The results showed that before adsorption organic matter in the water increased the probability of membrane wetting and the permeate conductivity;it also accelerated salt scales and decreased permeate flux.The membrane flux was in the range of 10.40 to 11.24 kg/(m2·h) after the pretreatment.It was suggested that the pretreatment decreased membrane fouling,maintained a stability of permeate flux and greatly improved permeate water quality.The concentration experimental results indicated that the module efficiency kept stable before concentration factor reached 5.0 with the wastewater after adsorption as feed,while the permeate flux was about 10.55 kg/(m2·h).The permeate water quality kept stable and the rejection rate was greater than 99.5% in all MD experiments with the wastewater after pretreatment as feed.Therefore,the integrated process of adsorption and MD may be of great potential to be utilized for treating saccharin wastewater.