Lu Jiang, Xingqi Zhu, Yifan Shen, Dongxiao Wang, Jiafeng Ren, Aimin Li, Yang Pan
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引用次数: 0
Abstract
In regions where drinking water sources containing elevated bromide levels, the formation of brominated disinfection byproducts (Br-DBPs) is enhanced, which may increase risks of cancer and birth defects. Anion exchange resin (AER) adsorption is a promising approach for reducing precursors of Br-DBPs (e.g., bromide and natural organic matter) due to its strong electrostatic force for reversible ion exchange process. However, high bromide water sources typically have high salinities, and the presence of co-existing ions (e.g., sulfate, nitrate, chloride) can significantly diminish the efficiency of conventional AERs, which use polyacrylic or polystyrene skeletons with trimethyl-ammonium functional groups. This study designed a novel AER with the polystyrene skeleton and tripentyl-ammonium functional group for the selective bromide removal, which resisted interferences from co-existing ions based on ion dehydration and ion-pairing electrostatic interactions. Column experiments with continuous high-bromide water flows demonstrated that the novel AER exhibited up to three times the operating capacity of conventional AERs, achieving reductions of 71.2%, 44.6%, and 67.7% in bromide, dissolved organic carbon, and specific UV absorbance, respectively. Competitive experiments showed that the novel AER's strong sulfate interference resistance enhanced its bromide selectivity. The electrostatic interactions between AER fragments and bromide or sulfate particles were quantitatively evaluated using density functional theory calculations. Treatment with the novel AER led to reductions in total organic bromine, aliphatic Br-DBPs, and cyclic Br-DBPs by 76.7%, 62.5%, and 90.5%, respectively. Notably, cytotoxicity assays using Chinese hamster ovary cells indicated a 39.7% decrease in overall cytotoxicity of chlorinated drinking water following treatment with the novel AER.
期刊介绍:
Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include:
•Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management;
•Urban hydrology including sewer systems, stormwater management, and green infrastructure;
•Drinking water treatment and distribution;
•Potable and non-potable water reuse;
•Sanitation, public health, and risk assessment;
•Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions;
•Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment;
•Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution;
•Environmental restoration, linked to surface water, groundwater and groundwater remediation;
•Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts;
•Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle;
•Socio-economic, policy, and regulations studies.