微波辅助膜蒸馏工艺传质强化效率研究

发布时间：2018-02-02 10:35

本文关键词： 微波辅射膜蒸馏苯酚腐殖酸晶体形貌　出处：《水处理技术》2017年12期 　论文类型：期刊论文

【摘要】：采用直接接触式膜蒸馏(DCMD)和微波辅助膜蒸馏(MWAMD)2种工艺,以Na Cl纯盐溶液或含一定量苯酚或者腐殖酸盐溶液为进料溶液,研究了盐含量及典型有机物对MWAMD过程传质强化效率和微波辐射对膜面晶体形貌的影响。结果表明,MWAMD工艺对膜通量具有强化效果,对模拟高含盐及含酚料液浓缩传质强化效果显著,当盐质量分数为20%时,传质强化增加率(ε)可到达15.14%,当料液含2000 mg/L苯酚时,ε为22.17%;膜蒸馏过程对盐离子和腐殖酸(HA)分子截留率接近100%,对酚离子有80%以上的截留率,而且微波辐射作用对截留率没有明显影响。微波辐射会减少晶体沉积量,而且会使晶体形貌呈不规则形状。
[Abstract]:Direct contact membrane distillation (DCMD) and microwave-assisted membrane distillation (MWAMD) were used in this paper. The pure NaCl salt solution or the solution containing phenol or humic acid salt was used as the feed solution. The effects of salt content and typical organic compounds on the enhancement efficiency of mass transfer in MWAMD process and the effect of microwave radiation on the crystal morphology of the membrane surface were studied. The enhanced mass transfer rate (蔚) can reach 15.14% when the salt mass fraction is 20. When the feed solution contained 2 000 mg/L phenol, the 蔚 was 22. 17%. The retention rate of salt ions and humic acid (HA) molecules in the membrane distillation process was close to 100 and the retention rate for phenol ions was more than 80%. Microwave irradiation has no obvious effect on the rejection rate. Microwave radiation can reduce the amount of crystal deposition and make the crystal shape irregular.
【作者单位】：中国矿业大学(北京);中国科学院生态环境研究中心高浓度难降解有机废水处理技术国家工程实验室;中国科学院大学;
【基金】：国家重点研发计划(2016YFC0400501) 国家自然科学基金(51578533)
【分类号】：TQ085.4
【正文快照】： 近年来,随着疏水膜水处理技术的发展,膜蒸馏技术相比于常规压力驱动膜工艺如纳滤(NF)和反渗透(RO)等技术展现出了巨大的优势,该技术可以在常压状态下对盐离子及挥发性较低的有机物达到接近100%的截留效果[1],而且可以用于浓度极高的含盐废水的浓缩处理[2]。在实际应用过程,由

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