Tufail Arbab, Price William E, Hai Faisal I
Strategic Water Infrastructure Laboratory, School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia.
Strategic Water Infrastructure Laboratory, School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW 2522, Australia.
Membranes (Basel). 2020 Dec 15;10(12):428. doi: 10.3390/membranes10120428.
This study investigated the degradation of five trace organic contaminants (TrOCs) by integrated direct contact membrane distillation (DCMD) and UV photolysis. Specifically, the influence of inorganic ions including halide, nitrate, and carbonate on the performance of the DCMD-UV process was evaluated. TrOC degradation improved in the presence of different concentrations (1-100 mM) of fluoride ion and chloride ion (1 mM). With a few exceptions, a major negative impact of iodide ion was observed on the removal of the investigated TrOCs. Of particular interest, nitrate ion significantly improved TrOC degradation, while bicarbonate ion exerted variable influence-from promoting to inhibiting impact-on TrOC degradation. The performance of DCMD-UV photolysis was also studied for TrOC degradation in the presence of natural organic matter, humic acid. Results indicated that at a concentration of 1 mg/L, humic acid improved the degradation of the phenolic contaminants (bisphenol A and oxybenzone) while it inhibited the degradation of the non-phenolic contaminants (sulfamethoxazole, carbamazepine, and diclofenac). Overall, our study reports the varying impact of different inorganic and organic ions present in natural water on the degradation of TrOCs by integrated DCMD-UV photolysis: the nature and extent of the impact of the ions depend on the type of TrOCs and the concentration of the interfering ions.
本研究考察了集成式直接接触膜蒸馏（DCMD）与紫外光解联用对五种痕量有机污染物（TrOCs）的降解效果。具体而言，评估了卤化物、硝酸盐和碳酸盐等无机离子对DCMD-UV工艺性能的影响。在不同浓度（1-100 mM）的氟离子和1 mM氯离子存在下，TrOCs的降解得到改善。除少数情况外，观察到碘离子对所研究的TrOCs的去除有较大负面影响。特别值得注意的是，硝酸根离子显著提高了TrOCs的降解，而碳酸氢根离子对TrOCs降解的影响则有所不同，从促进到抑制。还研究了在天然有机物腐殖酸存在下DCMD-UV光解对TrOCs降解的性能。结果表明，在浓度为1 mg/L时，腐殖酸提高了酚类污染物（双酚A和氧苯酮）的降解，同时抑制了非酚类污染物（磺胺甲恶唑、卡马西平和双氯芬酸）的降解。总体而言，我们的研究报告了天然水中不同无机和有机离子对集成式DCMD-UV光解降解TrOCs的不同影响：离子影响的性质和程度取决于TrOCs的类型和干扰离子的浓度。
