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Arsenic remediation of drinking water using iron-oxide coated coal bottom ash

机译:氧化铁包覆煤底灰对饮用水中砷的修复

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摘要

We describe laboratory and field results of a novel arsenic removal adsorbent called Arsenic Removal Using Bottom Ash' (ARUBA). ARUBA is prepared by coating particles of coal bottom ash, a waste material from coal fired power plants, with iron (hydr)oxide. The coating process is simple and conducted at room temperature and atmospheric pressure. Material costs for ARUBA are estimated to be low (~$0.08 per kg) and arsenic remediation with ARUBA has the potential to be affordable to resource-constrained communities. ARUBA is used for removing arsenic via a dispersal-and-removal process, and we envision that ARUBA would be used in community-scale water treatment centers. We show that ARUBA is able to reduce arsenic concentrations in contaminated Bangladesh groundwater to below the Bangladesh standard of 50 ppb. Using the Langmuir isotherm (R~2 = 0.77) ARUBAs adsorption capacity in treating real groundwater is 2.6×10~(-6)mol/g (0.20 mg/g). Time-to-90% (defined as the time interval for ARUBA to remove 90% of the total amount of arsenic that is removed at equilibrium) is less than 1 hour. Reaction rates (pseudo-second-order kinetic model, R~2≥0.99) increase from 2.4 ×10~5 to 7.2×10~5 g mol~(-1) min~(-1) as the groundwater arsenic concentration decreases from 560 to 170 ppb. We show that ARUBAs arsenic adsorption density (AAD), defined as the milligrams of arsenic removed at equilibrium per gram of ARUBA added, is linearly dependent on the initial arsenic concentration of the groundwater sample, for initial arsenic concentrations of up to 1600 ppb and an ARUBA dose of 4.0 g/L. This makes it easy to determine the amount of ARUBA required to treat a groundwater source when its arsenic concentration is known and less than 1600 ppb. Storing contaminated groundwater for two to three days before treatment is seen to significantly increase ARUBAs AAD. ARUBA can be separated from treated water by coagulation and clarification, which is expected to be less expensive than filtration of micron-scale particles, further contributing to the affordability of a community-scale water treatment center.
机译:我们描述了一种新型的除砷吸附剂的实验室和现场结果,该吸附剂称为使用底灰去除砷(ARUBA)。 ARUBA的制备方法是用氧化铁(氢)涂覆煤渣灰(燃煤电厂的废料)的颗粒。涂覆过程简单并且在室温和大气压下进行。据估计,阿鲁巴的材料成本很低(每公斤约0.08美元),用阿鲁巴进行砷修复有可能使资源有限的社区负担得起。 ARUBA用于通过分散和去除过程去除砷,我们设想ARUBA将用于社区规模的水处理中心。我们表明,ARUBA能够将受污染的孟加拉国地下水中的砷浓度降低至孟加拉国的50 ppb标准以下。使用Langmuir等温线(R〜2 = 0.77),ARUBAs在处理实际地下水中的吸附能力为2.6×10〜(-6)mol / g(0.20 mg / g)。到90%的时间(定义为ARUBA去除在平衡状态下去除的砷总量的90%的时间间隔)少于1小时。随着地下水砷浓度的降低,反应速率(伪二级动力学模型,R〜2≥0.99)从2.4×10〜5增加到7.2×10〜5 g mol〜(-1)min〜(-1)。 560至170 ppb。我们显示ARUBA的砷吸附密度(AAD)定义为在平衡状态下每克添加的ARUBA所除去的毫克毫克,其线性取决于地下水样品的初始砷浓度,初始砷浓度最高为1600 ppb,并且ARUBA剂量为4.0 g / L。当砷的浓度已知且小于1600 ppb时,这很容易确定处理地下水源所需的ARUBA量。在处理之前,将受污染的地下水储存两到三天会显着增加ARUBAs AAD。可以通过凝结和澄清将ARUBA与处理后的水中分离,这预计比过滤微米级颗粒更便宜,从而进一步提高了社区级水处理中心的承受能力。

著录项

  • 来源
    《Journal of Environmental Science and Health》 |2010年第11期|p.1446-1460|共15页
  • 作者单位

    Department of Mechanical Engineering, University of California, Berkeley, California, USA Lawrence Berkeley National Laboratory, Berkeley, California, USA;

    rnLawrence Berkeley National Laboratory, Berkeley, California, USA Department of Civil and Environmental Engineering, University of California, Berkeley, California, USA;

    rnLawrence Berkeley National Laboratory, Berkeley, California, USA Department of Civil and Environmental Engineering, University of California, Berkeley, California, USA;

    rnDepartment of Chemistry, University of California, Davis, California, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    arsenic; bangladesh; coal bottom ash; drinking water; water contaminants; water treatment;

    机译:砷;孟加拉国;煤灰饮用水;水污染物;水处理;

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