Zero Liquid Discharge of Ultrahigh-Salinity Brines with Temperature Swing Solvent Extraction.,Environmental Science & Technology

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Zero Liquid Discharge of Ultrahigh-Salinity Brines with Temperature Swing Solvent Extraction.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-06-23 , DOI: 10.1021/acs.est.0c02555
Chanhee Boo ₁ , Ian H Billinge ₁ , Xi Chen ₁ , Kinnari M Shah ₁ , Ngai Yin Yip _{1,

2}

Affiliation

Zero liquid discharge (ZLD) of hypersaline brines is technically and energetically challenging. This study demonstrates ZLD of ultrahigh-salinity brines using temperature swing solvent extraction (TSSE), a membrane-less and nonevaporative desalination technology. TSSE utilizes a low-polarity solvent to extract water from brine and then releases the water as a product with the application of low-temperature heat. Complete extraction of water from a hypersaline feed, simulated by 5.0 M NaCl solution (≈292 g/L TDS), was achieved using diisopropylamine solvent. Practically all of the salt is precipitated as mineral solid waste and the product water contains <5% of NaCl relative to the hypersaline feed brine. Consistent ZLD performance of high salt removals and product water quality was maintained in three repeated semibatch TSSE cycles, highlighting recyclability of the solvent. The practical applicability of the technique for actual field samples was demonstrated by ZLD of an irrigation drainage water concentrate. This study establishes the potential of TSSE as a more sustainable alternative to current thermal evaporation methods for zero liquid discharge of ultrahigh-salinity brines.

中文翻译：

通过变温溶剂萃取实现超高盐度盐水的零液体排放。

高盐盐水的零液体排放（ZLD）在技术和精力上都具有挑战性。这项研究证明了使用变温溶剂萃取（TSSE）技术（一种无膜非蒸发脱盐技术）对超高盐度盐水进行ZLD处理。TSSE利用低极性溶剂从盐水中提取水，然后通过施加低温热量将水作为产品释放。使用二异丙基胺溶剂，可以通过5.0 M NaCl溶液（≈292g / L TDS）模拟从高盐饲料中完全提取水。实际上，所有盐都以矿物固体废物的形式沉淀出来，并且相对于高盐进料盐水，产品水中的NaCl含量小于5％。在三个重复的半间歇TSSE循环中，保持了高脱盐率和产品水质的一致ZLD性能，突出了溶剂的可回收性。ZLD证明了该技术在实际田间样品中的实际适用性。这项研究建立了TSSE的潜力，可以替代目前的热蒸发方法，实现超高盐度盐水的零液体排放。

更新日期：2020-07-21

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