Treatment of cosmetic wastewater containing N, N-dimethylformamide and high concentration of chloride salt by chemical precipitation and electrochemical method

IF 8.1 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Chemosphere Pub Date : 2024-11-01 DOI:10.1016/j.chemosphere.2024.143780

Zhi-Lun Wu, Yu-Jen Shih, Dong-Ming Chao

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Abstract

High-strength wastewater containing elevated levels of chloride salt and N, N-dimethylformamide (DMF) solvent was collected from manufacturing of sunscreen cream (for UVA/UVB protection) at a cosmetic factory. In evaporation process, precipitates, formed due to the high chloride content (around 160 g/L), clog the pipeline, seriously reducing the treatment efficiency. This study aimed to develop a two-stage process integrating chemical precipitation and electrochemical oxidation to specifically remove the concentrated chloride salt and organic compounds (COD >100 g/L). Chloride ions were initially recovered as insoluble Friedel's salt using calcium hydroxide (Ca(OH)₂) and sodium aluminate (NaAlO₂) as the precipitants. The [Cl]/[Ca]/[Al] ratio and solution pH were optimized to obtain a pure crystallized phase of Ca₂AlCl(OH)₆•2H₂O. Afterwards, the organic compound were treated by a Fered-Fenton with the addition of H₂O₂ and FeSO₄ to degrade the remaining COD. The cost and energy consumption of this integrated processes were evaluated, compared to the conventional evaporation method.

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用化学沉淀和电化学方法处理含有 N，N-二甲基甲酰胺和高浓度氯盐的化妆品废水。

一家化妆品工厂在生产防晒霜（用于 UVA/UVB 防护）时收集了高强度废水，其中含有大量氯盐和 N, N-二甲基甲酰胺 (DMF) 溶剂。在蒸发过程中，由于氯化物含量高（约 160 g L-1）而形成的沉淀物堵塞了管道，严重降低了处理效率。本研究旨在开发一种集化学沉淀和电化学氧化于一体的两阶段工艺，专门去除高浓度氯盐和有机化合物（COD > 100 g L-1）。以氢氧化钙 (Ca(OH)2) 和铝酸钠 (NaAlO2) 作为沉淀剂，氯离子最初以不溶性弗里德尔盐的形式被回收。通过优化[Cl]/[Ca]/[Al]比率和溶液 pH 值，获得了 Ca2AlCl(OH)6-2H2O 的纯结晶相。之后，有机化合物通过加入 H2O2 和 FeSO4 的铁-芬顿法进行处理，以降解剩余的 COD。与传统的蒸发法相比，对这种综合工艺的成本和能耗进行了评估。

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来源期刊

Chemosphere 环境科学-环境科学

CiteScore

15.80

自引率

8.00%

发文量

4975

审稿时长

3.4 months

期刊介绍： Chemosphere, being an international multidisciplinary journal, is dedicated to publishing original communications and review articles on chemicals in the environment. The scope covers a wide range of topics, including the identification, quantification, behavior, fate, toxicology, treatment, and remediation of chemicals in the bio-, hydro-, litho-, and atmosphere, ensuring the broad dissemination of research in this field.