Integrated loose nanofiltration-electrodialysis process for sustainable resource extraction from high-salinity textile wastewater
Integrated loose nanofiltration-electrodialysis process for sustainable resource extraction from high-salinity textile wastewater
复制标题
从高盐纺织废水中可持续提取资源的集成松散纳滤-电渗析工艺
DOI：
10.1016/j.jhazmat.2021.126505
复制
发表时间：
2021-06-30
影响因子：
13.6
通讯作者：
Zhao, Shuaifei
中科院分区：
文献类型：
--
作者：
Lin, Jiuyang;Chen, Qin;Zhao, Shuaifei
有效地从高盐度纺织废水中提取有用资源是实现废水可持续管理的关键途径。本研究探索了一种松散纳滤-电渗析一体化工艺，同时回收高盐度纺织废水中的染料、氯化钠和纯水，从而关闭了物料循环，最大限度地减少了废物的排放。具体地说，提出了一种松散纳滤膜(截留分子量为-800 Da)来分离高盐度纺织废水中的染料和氯化钠。通过纳滤-超滤单元，包括预浓缩阶段和恒容超滤阶段，可以从高盐度纺织废水中回收染料，浓缩倍数为-9.0，即从2.01到17.9g.L-1，纯度为98.4%。配合后续电渗析的实施，有效地回收了松散型纳滤-透滤液中的氯化钠浓缩液和纯净水。同时，生产出的纯水进一步循环到纳滤-透析过滤单元。本研究展示了松散纳滤-透析法与电渗析相结合从高盐度纺织废水中充分提取资源化的潜力。
Effective extraction of useful resources from high-salinity textile wastewater is a critical pathway for sustainable wastewater management. In this study, an integrated loose nanofiltration-electrodialysis process was explored for simultaneous recovery of dyes, NaCl and pure water from high-salinity textile wastewater, thus closing the material loop and minimizing waste emission. Specifically, a loose nanofiltration membrane (molecular weight cutoff of -800 Da) was proposed to fractionate the dye and NaCl in the high-salinity textile wastewater. Through a nanofiltration-diafiltration unit, including a pre-concentration stage and a constant-volume diafiltration stage, the dye could be recovered from the high-salinity textile wastewater, being enriched at a factor of -9.0, i.e., from 2.01 to 17.9 g.L-1 with 98.4% purity. Assisted with the subsequent implementation of electrodialysis, the NaCl concentrate and pure water were effectively reclaimed from the salt-containing permeate coming from the loose nanofiltration-diafiltration. Simultaneously, the produced pure water was further recycled to the nanofiltration-diafiltration unit. This study shows the potential of the integration of loose nanofiltation-diafiltration with electrodialysis for sufficient resource extraction from high-salinity textile wastewater.