Evaluation of a pilot system for removal of the herbicide 2,4-dichlorophenoxyacetic acid and absorbance determination after clarification and adsorption on granular activated carbon

IF 0.4 4区 环境科学与生态学 Q4 WATER RESOURCES
E. R. C. Coelho, Renata Santos Brega
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引用次数: 1

Abstract

Abstract The herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) has been detected in water bodies worldwide, precluding their use for water supply. Despite this, scientific studies assessing the behavior of herbicides in water treatment systems are scarce, which motivated this study on 2,4-D removal. 2,4-D removal and its relationship with absorbance were investigated using a pilot system comprising coagulation, sedimentation, filtration, granular activated carbon (GAC) adsorption, and chlorinated disinfection. 2,4-D removal ranged from 15 to 64% after sedimentation, from negative values to 19% after filtration, and from 5 to 16% after chlorination, with total removal rates of 19 to 70%. Breakthrough curves showed an adsorption capacity of 0.70 mg g−1 GAC for a C/C0 ratio of 0.50 and a VTW/VGAC ratio of 3.598 for a breakthrough concentration of 30 ± 3 μg L−1. The positive correlation between absorbance and 2,4-D (R2 = 0.78) in the GAC column effluent indicated that absorbance can be used for early prediction of 2,4-D breakthrough. GAC column adsorption associated with coagulation produced treated water in accordance with the criteria for turbidity, apparent color, and 2,4-D concentration established by the Minister's Office/Ministry of Health — GM/MS Ordinance No. 888/2021, representing a promising technological alternative for 2,4-D removal from water treatment systems.
中试系统去除除草剂2,4-二氯苯氧乙酸的评价及颗粒活性炭澄清吸附后吸光度的测定
摘要除草剂2,4-二氯苯氧乙酸(2,4- d)在世界各地的水体中被检测到,妨碍了其在供水中的应用。尽管如此,评估除草剂在水处理系统中的行为的科学研究很少,这促使了对2,4- d去除的研究。采用混凝、沉淀、过滤、颗粒活性炭(GAC)吸附和氯化消毒的中试系统,研究了2,4- d去除率及其与吸光度的关系。沉淀后2,4- d去除率为15% ~ 64%,过滤后为负值~ 19%,氯化后为5% ~ 16%,总去除率为19% ~ 70%。突破曲线显示,当C/C0比为0.50时,吸附量为0.70 mg g−1 GAC;当突破浓度为30±3 μg L−1时,吸附量为3.598。GAC柱出水吸光度与2,4- d呈显著正相关(R2 = 0.78),表明吸光度可用于预测2,4- d的早期突破。GAC柱吸附与混凝产生的处理水相关,符合部长办公室/卫生部制定的浊度、表观颜色和2,4- d浓度标准- GM/MS法令No. 888/2021,代表了从水处理系统中去除2,4- d的有前途的技术替代方案。
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来源期刊
CiteScore
0.90
自引率
20.00%
发文量
101
审稿时长
>12 weeks
期刊介绍: Information not localized
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