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利用新型气隙式膜蒸馏组件对氯化钠溶液进行膜蒸馏试验研究。考察了进料温度、流速、浓度对膜通量、造水比和截留率的影响。结果表明,膜通量和造水比随着进料温度T3升高而增大,随着进料浓度的增加而减小;料液流量增加时膜通量增大,造水比降低;试验过程中截留率基本保持不变,稳定在99.8%以上。当料液浓度为3.0%,进料温度T1为30.0℃,T3为95.0℃、流量为7.0 L/h时,膜通量为4.1 L/(m2·h),造水比为7.0,截留率可达99.8%,经过60 d浓缩试验后,膜通量、造水比和截留率均保持稳定。
Membrane Distillation of Sodium Chloride Solution by a Novel Air-gap Membrane Distillation Unit. The effects of feed temperature, flow rate and concentration on membrane flux, water production ratio and rejection were investigated. The results showed that the membrane flux and water production ratio increased with the increase of feed temperature T3 and decreased with the increase of feed concentration. The membrane flux increased and the water production ratio decreased when the feed liquid flow rate increased. The retention rate remained basically unchanged during the process, stable at 99.8%. When the feed concentration was 3.0%, feed temperature T1 was 30.0 ℃, T3 was 95.0 ℃, flow rate was 7.0 L / h, membrane flux was 4.1 L / (m2 · h), water production ratio was 7.0, retention rate Up to 99.8%. After 60 days of concentration test, membrane flux, water production ratio and rejection rate remained stable.