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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Amending irrigation channels with jute-mesh structures to decrease arsenic loading to rice fields in Bangladesh
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Amending irrigation channels with jute-mesh structures to decrease arsenic loading to rice fields in Bangladesh

机译：修改具有黄麻网状结构的灌溉渠道，以减少孟加拉国稻田的砷负荷

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摘要

Extensive use of arsenic-contaminated well water for irrigation of rice fields in Bangladesh has led to elevated arsenic concentrations in rice plants, decreased rice yields, and increased human exposure to arsenic. The goal of this study was to investigate whether arsenic removal from irrigation water could be improved within distribution channels by amending them with physical structures that both induce water treatment and maintain water-conveyance capacities. Chemical and hydraulic effects of amending channels with jute-mesh structures were characterized within 27 m-long experimental channels at a Bangladesh field site. Removal of total arsenic, iron and phosphorus from solution was enhanced within amended channels over unamended channels, with 7% of total As removed in amended channels vs. 3% in unamended channels. Increased elemental removal in amended channels was largely due to increases in residence time and particle-trapping efficiency, but removal via oxidative particle formation did not appear to be substantially enhanced. Results suggest that in-channel structures could be a useful tool for decreasing arsenic loading to rice fields, particularly where constrained channel spatial geometries limit the ability to overcome hydrogeochemical thresholds for enhanced arsenic removal. To improve the practical utility of structure-amended channels, future work could optimize structure designs and establish the season-long sustainability of enhanced arsenic-removal strategies. (C) 2014 Elsevier B.V. All rights reserved.
机译：孟加拉国广泛使用受砷污染的井水灌溉稻田，导致水稻植株中砷的浓度升高，稻米产量下降以及人类接触砷的风险增加。这项研究的目的是研究是否可以通过在灌溉渠中对砷进行物理修改来改善灌溉水中的砷含量，这些结构既可以诱导水处理，又可以保持水的输送能力。在孟加拉国一个实地站点的27 m长的实验河道内，对黄麻网状结构的河道的化学和水力作用进行了表征。与未修正通道相比，修正通道中溶液中总砷，铁和磷的去除率得到了提高，修正通道中总砷的去除率为7％，未修正通道中的总砷去除率为3％。修正通道中元素去除的增加主要是由于停留时间和颗粒捕集效率的提高，但是通过氧化性颗粒形成的去除似乎并未得到明显增强。结果表明，河道内结构可能是减少砷对稻田负载的有用工具，特别是在受约束的河道空间几何形状限制了克服水文地球化学阈值以提高砷去除能力的情况下。为了提高结构修正通道的实用性，未来的工作可以优化结构设计，并建立增强型除砷策略在整个季节的可持续性。 （C）2014 Elsevier B.V.保留所有权利。

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