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Natural Attenuation of Perchlorate in Denitrified Groundwater

机译：高氯酸盐在反硝化地下水中的自然衰减

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摘要

Monitoring of a well-defined septic system groundwater plume and groundwater discharging to two urban streams located in southern Ontario, Canada, provided evidence of natural attenuation of background low level (ng/L) perchlorate (ClO_1~-) under denitrifying conditions in the field. The septic system site at Long Point contains ClO_4~- from a mix of waste water, atmospheric deposition, and periodic use of fireworks, while the nitrate plume indicates active denitrification. Plume nitrate (NO_3~--N) concentrations of up to 103 mg/L declined with depth and downgradient of the tile bed due to denitrification and anammox activity, and the plume was almost completely denitrified beyond 35 m from the tile bed. The ClO_4~- natural attenuation occurs at the site only when NO_3~--N concentrations are ＜0.3 mg/L, after which ClO_4~- concentrations decline abruptly from 187 ± 202 to 11 ± 15 ng/L. A similar pattern between NO_3~--N and ClO_4~- was found in groundwater discharging to the two urban streams. These findings suggest that natural attenuation (i.e., biodegradation) of ClO_4~- may be commonplace in denitrified aquifers with appropriate electron donors present, and thus, should be considered as a remediation option for ClO_~-4~ contaminated groundwater.
机译：对定义明确的化粪池系统地下水羽流和向加拿大安大略省南部的两条城市溪流排放的地下水进行监测，提供了田间反硝化条件下自然背景低浓度（ng / L）高氯酸盐（ClO_1〜-）的自然衰减的证据。 。 Long Point的化粪池站点含有来自废水，大气沉积物和定期使用烟火的ClO_4〜-，而硝酸盐羽流则表明其活跃的反硝化作用。由于反硝化作用和厌氧分解活性，随着地砖深度和坡度的降低，硝酸铅（NO_3-〜-N）的浓度随着地层深度和向下梯度的降低而降低，并且距离地砖35 m以上几乎完全被反硝化。仅当NO_3〜-N浓度＜0.3 mg / L时，ClO_4〜-自然衰减才会在该部位发生，此后ClO_4〜-浓度从187±202突然下降至11±15 ng / L。在排入两条城市河流的地下水中，发现了NO_3-〜N和ClO_4-〜-之间的相似模式。这些发现表明，ClO 4--的自然衰减（即生物降解）在存在适当电子给体的反硝化含水层中很常见，因此，应将其视为对ClO-4-污染的地下水的补救选择。

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  • 来源
    《Ground water》 |2014年第1期|63-70|共8页
  • 作者

    William D. Robertson; James W. Roy; Susan J. Brown; Dale R. Van Stempvoort; Greg-Bickerton;

  • 作者单位

    Department of Earth Sciences,University of Waterloo, Waterloo, Ontario, N2L3 G1 Canada;

    Environment Canada, Burlington, Ontario, Canada;

    Environment Canada, Burlington, Ontario, Canada;

    Environment Canada, Burlington, Ontario, Canada;

    Environment Canada, Burlington, Ontario, Canada;

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