Department of Civil, Geological & Mining Engineering, Ecole Polytechnique de Montréal, 2900 Boulevard Édouard-Montpetit, Montréal, Québec, H3T 1J4, Canada.
Department of Civil Engineering, The University of British Columbia, 6250 Applied Science Lane, Vancouver, BC, V6T 1Z4, Canada.
Water Res. 2018 Dec 1;146:1-9. doi: 10.1016/j.watres.2018.07.057. Epub 2018 Jul 25.
Anionic exchange is an effective treatment option for the removal of natural organic matter from surface waters. However, the management of the spent brine regenerant often limits the adoption of this process. The current study reports one year of operation of ion exchange resins under biological mode (BIEX, i.e. without regeneration to promote biofilm growth on the media) compared to the performance of (i) ion exchange with weekly regeneration (IEX), (ii) granular activated carbon under biological mode (BAC) and (ii) granular activated carbon under adsorption mode (GAC). Four parallel pilot filters (GAC, BAC, IEX and BIEX) were fed with a colored and turbid river water without pretreatment. Although IEX provided the best performance (80% DOC removal) throughout the study, BIEX achieved a similar performance to IEX prior to DOC breakthrough (92 days) and subsequently achieved a mean DOC removal of 62% in warm water conditions. The GAC filter was rapidly exhausted (2 weeks) while the BAC filter only provided a 5% DOC reduction. Full nitrification was observed on both the BIEX and BAC filters under warm water conditions (>15 °C). After one year of operation, BIEX was successfully regenerated with brine. According to a mass balance, 69% of DOC removal in BIEX was due to ion exchange while we assume the remainder was biodegraded. Operation of ion exchange in biological mode is a promising option to reduce spent brine production while still achieving high DOC removal.
阴离子交换是去除地表水中天然有机物的有效处理方法。然而，再生盐水的管理通常限制了该工艺的应用。本研究报告了离子交换树脂在生物模式下（BIEX，即不进行再生以促进介质上生物膜的生长）运行一年的情况，与（i）每周再生的离子交换（IEX）、（ii）生物模式下的颗粒活性炭（BAC）和（iii）吸附模式下的颗粒活性炭（GAC）的性能进行了比较。四个平行的中试过滤器（GAC、BAC、IEX 和 BIEX）未经预处理就接收有色和浑浊的河水。尽管 IEX 在整个研究过程中提供了最佳性能（80%DOC 去除率），但 BIEX 在 DOC 突破之前（92 天）达到了与 IEX 相似的性能，随后在温水条件下实现了 62%的平均 DOC 去除率。GAC 过滤器在两周内就耗尽了（2 周），而 BAC 过滤器仅提供了 5%的 DOC 减少。在温水条件下（>15°C），BIEX 和 BAC 过滤器都实现了完全硝化。根据质量平衡，BIEX 中 69%的 DOC 去除是由于离子交换，而我们假设其余部分是生物降解的。在生物模式下操作离子交换是减少废盐水产量的一种很有前途的方法，同时仍然可以实现高 DOC 去除率。
