科研之友
微信
新浪微博
Facebook
分享链接
摘要
Naphthalenesulfonic acid effluents with concentrated bivalent salts cause serious environmental pollution and are regarded as recalcitrant pollutants for degradation. In this study, a piperazine-ethylenediamine (PIP-EDA) nanofiltration (NF) membrane with significantly different rejections for 1-naphthylamine-3,6,8-trisulfonic acid (T acid) and (NH4)(2)SO4 was designed to recover this kind of important intermediate compound for dyes from wastewater with concentrated bivalent salt. The membrane was fabricated by regulating the chain structure and membrane property of PIP NF membrane using linear EDA through interfacial polymerization. The optimized PIP-EDA NF membrane exhibited excellent rejection ( > 94%) for T acid and the rejection for (NH4)(2)SO4 is only 36%. NF experiment and characterization results indicated that the addition of a small amount of EDA can obviously improve the permeation flux and the difference between rejections for T acid and salt simultaneously. The effects of solute concentration and operation conditions on membrane performance were investigated to explore the feasibility of this NF process. The results demonstrated that the change in salt concentration had a much greater impact on membrane performance than the variation in T acid concentration. Operation pressure and pH of the feed solution also significantly affected the membrane performance. The rejections for T acid and salt showed opposite change laws in the membrane fouling experiment, likely because of their differences in mechanisms. This new NF process can be used for the effective recovery and reuse of naphthalenesulfonic acid from concentrated salt wastewater.
- 出版日期2014-10-15
- 单位浙江大学; 杭州水处理技术研究开发中心有限公司
