Assessment of the suitability of greensand filtration for Mn removal for private wells

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-04-19 DOI:10.1139/cjce-2023-0560

Vanessa Di Battista, Juliana Smillovich, Debra Hausladen

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Abstract

Greensand filtration is a common treatment option for manganese, sulphide, and iron removal; poor maintenance, however, can compromise effectiveness, leading to increased post-treatment Mn concentrations. A private drinking-water well in exceedance of Health Canada’s maximum allowable concentration for Mn was sampled over a one-year period to assess Mn removal via greensand filtration. Mn concentrations post-treatment were approximately twofold higher than raw well water. Reducing conditions, evidenced by negative oxidation-reduction potential (ORP) of the effluent, were central to transforming solid-phase Mn-oxides to soluble Mn(II). Monitoring revealed that water usage patterns caused variability in post-treatment Mn, with peak concentrations (>3.5x higher than influent water) observed after a 7-day idle period. As inadequate oxidant addition can lead to reducing conditions, monitoring ORP may facilitate proxy surveillance for Mn release. Findings underscore the importance of human factors (e.g., aesthetic concerns, barriers to maintenance, perceived risk) when evaluating overall benefits and drawbacks of treatment systems.

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评估绿砂过滤法去除私人水井锰的适用性

绿砂过滤是去除锰、硫化物和铁的一种常见处理方法；然而，维护不当会影响效果，导致处理后的锰浓度增加。为了评估绿砂过滤除锰的效果，我们对一口锰浓度超过加拿大卫生部最高允许浓度的私人饮用水井进行了为期一年的采样。处理后的锰浓度约为原井水的两倍。出水的负氧化还原电位（ORP）表明，还原条件是将固相锰氧化物转化为可溶性锰（II）的关键。监测结果表明，水的使用模式会导致处理后锰的变化，7 天闲置期后会出现峰值浓度（比进水高出 3.5 倍）。由于氧化剂添加不足会导致还原条件，因此监测 ORP 可能有助于对锰释放进行代理监控。研究结果表明，在评估处理系统的整体利弊时，人为因素（如美观问题、维护障碍、感知风险）非常重要。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.