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首页> 外文会议>2011 water quality technology conference amp; exposition: An Oasis of Ideas for a Changing Environment. >Rapid Denitrification in a Deep Basalt Aquifer: Implications for Aquifer Storage and Recovery
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Rapid Denitrification in a Deep Basalt Aquifer: Implications for Aquifer Storage and Recovery

机译：玄武岩深层含水层中的快速反硝化：对含水层储存和恢复的影响

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Aquifer storage and recovery (ASR), typically utilized as a municipal water managementrntechnique, also can provide a means of storing water for irrigation in agricultural areas wherernwater availability is limited. The Umatilla Basin in north central Oregon receives fewer than 20rninches of annual precipitation. The basin is underlain by lavas of the Columbia River BasaltrnGroup (CRBG), highly transmissive confined aquifers with low recharge rates. Years ofrnoverdrafting aquifers to irrigate agriculture land have depleted the CRBG and furtherrngroundwater use has been restricted and locally curtailed. ASR operations in the UmatillarnBasin can provide needed irrigation water and supply recharge to the depleted aquifer.rnTwo large agricultural operations in the Umatilla Basin began using ASR in 2006 to providernwater for irrigation. Source water for ASR storage is pumped from a seasonally availablernshallow alluvial aquifer, which has variable nitrate concentrations ranging between <3 mg/L torn>9 mg/L. Per Oregon ASR rules, nitrate concentrations in injection source water are limited torna maximum of 7 mg/L. Nitrate in the recovered water, however, decreases quickly to < 1rnmg/L, suggesting that nitrate may not persist within the CRBG aquifer used for ASR storage.rnIn contrast to nitrate, other constituents in the recovered water (e.g., calcium, sodium, chloride,rnand potassium) show little variation, inconsistent with either migration or mixing as anrnexplanation of the nitrate decrease. Nitrogen isotopic ratios (?~(15)N) increase markedly, rangingrnfrom +3.5 to > +50, and correlate inversely with nitrate concentrations. This variation occursrnwithin a period of < 3 weeks and recovery of < 10% of the originally injected volume. Thesernobservations are consistent with rapid denitrification, suggesting that nitrate, and thereforernASR, pose little risk to water quality in the CRBG aquifer.
机译：通常用作市政水管理技术的含水层存储和回收（ASR），还可以提供一种在水资源有限的农业地区存储灌溉用水的方法。俄勒冈州中北部的Umatilla盆地年降水量不到20英寸。该盆地被哥伦比亚河玄武岩群（CRBG）的熔岩所覆盖，这是高渗透率的封闭含水层，补给率低。多年的透水蓄水层灌溉农业用地已经耗尽了CRBG，进一步限制了地下水的使用，并在当地减少了用水量。在Umatillarn盆地的ASR作业可以提供所需的灌溉水并为枯竭的含水层补给水。2006年，在Umatilla盆地的两个大型农业作业开始使用ASR来提供灌溉用水。用于ASR储存的水源是从季节性可用的浅层冲积含水层中抽出的，其硝酸盐浓度的变化范围在<3 mg / L至> 9 mg / L之间。根据俄勒冈州的ASR规则，注入源水中的硝酸盐浓度最高不得超过7 mg / L。然而，回收水中的硝酸盐迅速降低至<1rnmg / L，这表明硝酸盐可能不会残留在用于ASR储存的CRBG含水层中。rn与硝酸盐相反，回收水中的其他成分（例如钙，钠，氯化物） （硝酸钾和硝酸钾）几乎没有变化，与迁移或混合不一致，因为硝酸盐的反硝化作用降低。氮同位素比值（？〜（15）N）明显增加，范围从+3.5到> +50，并且与硝酸盐浓度成反比。这种变化在少于3周的时间内发生，并且恢复率小于原始注射量的10％。这些反硝化现象与快速反硝化一致，表明硝酸盐和因此的ASR对CRBG含水层中的水质几乎没有危害。

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