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首页> 外文期刊>RSC Advances >The contributions and mechanisms of iron-microbes-biochar in constructed wetlands for nitrate removal from low carbon/nitrogen ratio wastewater
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The contributions and mechanisms of iron-microbes-biochar in constructed wetlands for nitrate removal from low carbon/nitrogen ratio wastewater

机译：铁 - 微生物 - 生物炭在硝酸盐中湿地湿地污水中硝酸盐去除的贡献和机制

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摘要

The removal efficiency of nitrate from low carbon/nitrogen ratio wastewater has been restricted by the lack of organics for several decades. Here, a system coupling chemical reduction, microbial denitrification and constructed wetlands (RDCWs) was developed to investigate the effect and possible mechanisms for nitrate degradation. The results showed that this coupling system could achieve a nitrate removal efficiency of 97.07 ± 1.76%, 85.91 ± 3.02% and 56.63 ± 2.88% at a hydraulic retention time of 24 h, 12 h and 6 h with feeding nitrate of 15 mg L ~(?1) , respectively. These removal efficiencies of nitrate were partly caused by microbes and biochar with a contribution rate of 31.08 ± 4.43% and 9.50 ± 3.30%. Besides, microbes were closely related to iron and biochar for the removal of nitrate. Simplicispira was able to utilize hydrogen produced by iron corrosion as an electron donor while nitrate accepted electrons to be reduced. Porous biochar could release dissolved organic matter, which provided a good living circumstance and carbon source for microbes. Therefore, the RDCW system is potential for large-scale application due to its low cost and simple operation.
机译：从低碳/氮比废水中硝酸盐的去除效率受到了几十年的缺乏有机物的限制。这里，开发了一种系统耦合化学降低，微生物反硝化和构造的湿地（RDCWS）以研究硝酸盐降解的效果和可能的机制。结果表明，该耦合系统可以在24小时，12小时和6小时的液压保留时间下达到97.07±1.76％，85.91±3.02％和56.63±2.88％的硝酸盐去除效率为85.91±3.02％和56.63±2.88％，含有15mg的硝酸盐〜 （？1）分别。这些硝酸盐的去除效率部分由微生物和生物炭引起，贡献率为31.08±4.43％和9.50±3.30％。此外，微生物与铁和生物炭密切相关，以去除硝酸盐。 SimplicisPira能够利用铁腐蚀产生的氢，作为电子给体，而硝酸盐接受的电子被降低。多孔生物炭可以释放溶解的有机物，其为微生物提供了良好的活性环境和碳源。因此，RDCW系统由于其低成本和操作而导致大规模应用。

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