液晶单体(lcm)在废水处理中的最新进展和挑战

IF 8.1 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Sanjeeb Mohapatra, Mui-Choo Jong, Suparna Mukherji, Jules. B. van Lier, Henri Spanjers
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引用次数: 0

摘要

液晶单体广泛应用于液晶显示器(lcd)中,是一种具有持久性、生物蓄积性和毒性的有机污染物。对SCOPUS数据的网络分析揭示了显著的知识缺口,特别是关于WWTPs中lcm的命运。现有文献强调,污水中LCM浓度差异很大,浓度升高与工业和电子废物回收活动有关。本文综述了污水处理厂(WWTPs)中lcm的发生、命运和处理,特别是氟化lcm (f - lcm)。传统的污水处理工艺对lcm的去除效率中等(约84%),但f - lcm通常存在。紫外线/过氧硫酸氢盐(UV/PDS)等先进处理技术对含联苯和乙氧基的lcm的去除率为77-84%。这些基团改变了电子分布,使分子更容易受到羟基和硫酸盐自由基等活性物质的氧化攻击。降解途径包括联苯、乙氧基和C-F键的裂解,产生毒性较小的副产物,如草酸和环己烷。然而,一些形成的降解中间体是有毒的,需要进一步研究处理工艺。本综述强调了系统监测废水中的lcm及其在处理后的废水和污泥中的转化产物的必要性,以及改善处理技术以减轻环境和健康风险的必要性。这篇综述强调了改善lcm废水管理战略的紧迫性,以及未来研究解决关键知识空白的必要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Liquid Crystal Monomers (LCMs) of Emerging Concern: Recent Progress and Challenges in Wastewater Treatment

Purpose of Review

Liquid crystal monomers (LCMs), used extensively in liquid crystal displays (LCDs), have emerged as persistent, bioaccumulative, and toxic organic pollutants. A network analysis of SCOPUS data revealed significant knowledge gaps, especially concerning the fate of LCMs in WWTPs. The available literature highlights that influent LCM concentrations vary widely, with elevated levels linked to industrial and e-waste recycling activities. This review examines the occurrence, fate, and treatment of LCMs, particularly fluorinated LCMs (F-LCMs), in wastewater treatment plants (WWTPs).

Recent Findings

Conventional WWTP processes achieve moderate removal efficiencies (~ 84%) for LCMs, but F-LCMs often persist. Advanced treatment techniques such as UV/peroxydisulfate (UV/PDS) showed removal rates of 77–84% for LCMs with biphenyl and ethoxy groups. These groups alter electron distribution, making the molecules more susceptible to oxidative attack by reactive species such as hydroxyl and sulfate radicals. Degradation pathways include cleavage of biphenyl, ethoxy, and C-F bonds, producing less toxic by-products such as oxalic acid and cyclohexane. However, some degradation intermediates formed are toxic, necessitating further research of the treatment processes.

Summary

This review underscores the need for systematic monitoring of LCMs in wastewater and their transformation products in treated wastewater and sludge, alongside advancements in treatment technologies to mitigate environmental and health risks. This review highlights the urgency of improving wastewater management strategies for LCMs and the need for future research to address the critical knowledge gaps.

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来源期刊
Current Pollution Reports
Current Pollution Reports Environmental Science-Water Science and Technology
CiteScore
12.10
自引率
1.40%
发文量
31
期刊介绍: Current Pollution Reports provides in-depth review articles contributed by international experts on the most significant developments in the field of environmental pollution.By presenting clear, insightful, balanced reviews that emphasize recently published papers of major importance, the journal elucidates current and emerging approaches to identification, characterization, treatment, management of pollutants and much more.
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