Inhibition of nitrate and the accumulated denitrification intermediate (nitrite) on perchlorate bioreduction

IF 2 Q3 Environmental Science

Water Quality Research Journal of Canada Pub Date : 2014-11-01 DOI:10.2166/WQRJC.2014.010

Rui Wang, Liang Chen, Fei Liu, H. Chen, Jia Zhang, Ming Chen

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引用次数: 1

Abstract

Bioreduction of perchlorate and nitrate by perchlorate-reducing microorganisms (PRMs) is an environmentally friendly, economic, and efficient technology to treat mixed plumes composed of these substances. The influence of perchlorate, nitrate, and denitrification intermediates on PRM activity is a critical factor, which may affect the efficiency of treatment technology. This study investigated the inhibition of nitrate and the intermediate (nitrite) accumulated during the denitrification process on perchlorate bioreduction via a batch-type experiment. From the experiment, it was found that perchlorate had no effect on the denitrification process and that the reduction rate of perchlorate could be improved when NO 3 − -N/ClO 4 − ≤1.2. However, a negative effect of nitrate on perchlorate reduction was observed when NO 3 − -N/ClO 4 − >1.2 with an accumulation of 18.0 mg NO 2 − -N /L. This negative effect increased with the concentration of nitrate. Moreover, nitrite from the denitrification process had a similar negative effect on perchlorate reduction. Bioreduction of perchlorate was not started until nitrite was totally reduced, and a 2–13 day lag period was observed for perchlorate reduction after nitrite depletion.

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硝酸盐和积累的反硝化中间体(亚硝酸盐)对高氯酸盐生物还原的抑制作用

利用高氯酸盐还原微生物(PRMs)对高氯酸盐和硝酸盐进行生物还原是一种环保、经济、高效的处理由这些物质组成的混合羽流的技术。高氯酸盐、硝酸盐和反硝化中间体对PRM活性的影响是影响处理工艺效率的关键因素。本研究通过间歇式实验研究了硝酸盐和反硝化过程中积累的中间产物(亚硝酸盐)对高氯酸盐生物还原的抑制作用。实验发现，高氯酸盐对反硝化过程没有影响，当no 3−-N/ clo4−≤1.2时，高氯酸盐的还原速率可以得到提高。然而，当no3−-N/ clo4−>1.2积累18.0 mg no2−-N/ L时，观察到硝酸盐对高氯酸盐还原的负面影响。这种负面影响随着硝酸盐浓度的增加而增加。此外，反硝化过程中产生的亚硝酸盐对高氯酸盐的还原也有类似的负面影响。高氯酸盐的生物还原直到亚硝酸盐完全还原后才开始，并且在亚硝酸盐耗尽后观察到高氯酸盐的还原滞后2-13天。

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来源期刊

Water Quality Research Journal of Canada WATER RESOURCES-

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Water Quality Research Journal publishes peer-reviewed, scholarly articles on the following general subject areas: Impact of current and emerging contaminants on aquatic ecosystems Aquatic ecology (ecohydrology and ecohydraulics, invasive species, biodiversity, and aquatic species at risk) Conservation and protection of aquatic environments Responsible resource development and water quality (mining, forestry, hydropower, oil and gas) Drinking water, wastewater and stormwater treatment technologies and strategies Impacts and solutions of diffuse pollution (urban and agricultural run-off) on water quality Industrial water quality Used water: Reuse and resource recovery Groundwater quality (management, remediation, fracking, legacy contaminants) Assessment of surface and subsurface water quality Regulations, economics, strategies and policies related to water quality Social science issues in relation to water quality Water quality in remote areas Water quality in cold climates The Water Quality Research Journal is a quarterly publication. It is a forum for original research dealing with the aquatic environment, and should report new and significant findings that advance the understanding of the field. Critical review articles are especially encouraged.