Abstract Conventional reverse osmosis (RO), a novel temperature-swing RO (TSRO), and tailored nanofiltration (NF), were investigated to target the removal of the chlorophenoxy broad-leaf herbicide 2-methyl-4-chlorophenoxyacetic acid (MCPA) from saline (HCl-rich) wastewater at pH between 1 and 2. Batch concentration by RO at 17.5 bar using BW30 and SW30 membranes showed similar performance, where BW30 showed rejections of 95.3% for MCPA and 25.9% for acid, but initial flux of 13 L.m−2.h−1 declined by 82% upon reaching 80% volume recovery. For the novel TSRO using BW30 and swing temperature from 24°C to 45 °C based on MCPA solubility tests, practical higher overall flux was achieved while showing similar MCPA rejection, but with slightly higher acid rejection of 37%. Pilot scale NF using NF270 and NF90 membranes showed decreased rejections of both MCPA and acid. The NF270 showed rejections of 71.3% for MCPA and 16.8% for acid. But despite lower MCPA rejection, its high flux up to 80% volume recovery could be used with RO or other treatments to meet MCPA discharge requirements. RO and NF are therefore suitable for MCPA removal from saline (HCl-rich) wastewaters, but novel temperature swing RO process offers potential to achieve higher MCPA rejection simultaneously to higher overall flux at practical volume recoveries.

中文翻译：

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反渗透纳滤去除含盐工业废水中除草剂2-甲基-4-氯苯氧乙酸（MCPA）

摘要 研究了传统反渗透 (RO)、新型变温反渗透 (TSRO) 和定制纳滤 (NF) 以去除氯苯氧基阔叶除草剂 2-甲基-4-氯苯氧基乙酸 (MCPA) pH 值介于 1 和 2 之间的含盐（富含 HCl）废水。使用 BW30 和 SW30 膜在 17.5 bar 下通过 RO 批量浓缩显示出相似的性能，其中 BW30 对 MCPA 的截留率为 95.3%，对酸的截留率为 25.9%，但初始通量为 13在达到 80% 的体积回收率后，Lm-2.h-1 下降了 82%。对于使用 BW30 和基于 MCPA 溶解度测试的 24°C 至 45°C 摆动温度的新型 TSRO，实现了实际更高的总通量，同时显示出类似的 MCPA 截留率，但酸截留率略高，为 37%。使用 NF270 和 NF90 膜的中试规模 NF 显示出对 MCPA 和酸的截留率降低。NF270 对 MCPA 的剔除率为 71.3%，对酸的剔除率为 16.8%。但是，尽管 MCPA 去除率较低，但其高达 80% 的体积回收率的高通量可用于 RO 或其他处理以满足 MCPA 排放要求。因此，RO 和 NF 适用于从含盐（富含 HCl）废水中去除 MCPA，但新型变温 RO 工艺提供了在实际体积回收率下同时实现更高 MCPA 去除率和更高总通量的潜力。