操作参数对渗透反应屏障去除污水中甲基叔丁基醚的影响

IF 1.3 Q4 ENVIRONMENTAL SCIENCES
Farhad Ghayurdoost, A. Assadi, M. Mehrasbi
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引用次数: 0

摘要

背景:水资源中的难降解有机物修复仍然是一个重大的环境问题,人们正在继续努力证明去除污染的可行和经济的处理方案。方法:在本研究中,研究了零价铁(ZVI)颗粒和砂混合物在柱状反应器中的渗透反应屏障(PRB)从水相中去除甲基叔丁基醚(MTBE)的效率。系统性能为MTBE去除,初始pH、反应时间、污染物含量、催化剂负荷、水力负荷率(HLR)和反应速率常数为自变量。结果:随着pH值、HLR和污染物浓度的增加,工艺效率降低。在这种情况下,在pH=7、HLR=0.23 m3/m2·d和C0=1 mg/L的条件下获得了最佳工艺条件,其去除率达到90.32%。高硝酸盐浓度和硬度作为干预因素,使工艺效率分别降低到44.61和51.4%以下。干扰因素的缺乏对MTBE还原的反应速率有相当大的影响,其分别比存在钙硬度和硝酸盐时的反应速率高约2.65倍和4.11倍。结论:基于充填介质和水力条件,PRB技术是一种可靠、稳健的含烃地下水修复系统。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of operational parameters on methyl tert-butyl ether removal by permeable reactive barrier from polluted waters
Background: Recalcitrant organics remediation from water resources continues to be a significant environmental problem and there is a continued effort to demonstrate practicable and economical treatment options for pollution removal. Methods: In this study, the efficiency of the permeable reactive barrier (PRB) in a column reactor using zero-valent iron (ZVI) particles and sand mixture in the removal of methyl tert-butyl ether (MTBE) from aquatic phases was investigated. The system performance was MTBE removal while initial pH, reaction time, pollutant content, catalyst load, hydraulic loading rate (HLR), and the reaction rate constant were independent variables. Results: The results showed that the process efficiency decreased by increasing pH, HLR, and pollutant concentration. In this case, the optimal conditions were obtained at pH=7, HLR=0.23 m3 /m2 ·d, and C0=1 mg/L, which achieved a remarkable removal efficiency up to 90.32%. The high nitrate concentrations and hardness as intervening factors reduced process efficiency to less than 44.61 and 51.4%, respectively. The lack of interfering factors had a considerable effect on the reaction rate of MTBE reduction, which is approximately 2.65 and 4.11 times higher than that in the presence of calcium hardness and nitrate, respectively. Conclusion: The PRB technology can be suggested as a reliable and robust system to remediate groundwater containing hydrocarbons based on filling media and hydraulic conditions.
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来源期刊
CiteScore
2.40
自引率
37.50%
发文量
17
审稿时长
12 weeks
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