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首页> 外文期刊>Journal of environmental sciences >Stimulation impact of electric currents on heterotrophic denitrifying microbial viability and denitrification performance in high concentration nitrate-contaminated wastewater
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Stimulation impact of electric currents on heterotrophic denitrifying microbial viability and denitrification performance in high concentration nitrate-contaminated wastewater

机译：电流对高浓度硝酸盐污染废水中异养反硝化微生物活力和反硝化性能的刺激影响

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摘要

Electric current stimulation has been shown to have a positive influence on heterotrophic denitrifying microbial viability and has the potential to improve wastewater denitrification performance. This study investigated the effects of varying current densities on microbial activity and NO3?removal efficiency under heterotrophic conditions.NO3?removal rate was highest at an applied current density of 400?mA/m2. However, the optimum removal efficiency of total inorganic nitrogen (TIN; 99%) was achieved when the current density was fixed at 200?mA/m2. Accumulation of NH4+-N and NO2?-N byproducts were also minimized at this current density. The activity of heterotrophic denitrifying microorganisms was much higher at both 200 and 400?mA/m2. Moreover, the average adenosine-5′-triphosphate (ATP) content (an indicator of cell metabolism) at a current density of 1600?mA/m2was lower than that under no current, indicating heterotrophic denitrifying microbial activity can be inhibited at high current densities. Hence, direct electrical stimulation on the activity of heterotrophic denitrifying microorganisms in the developed system should be lower than 1600?mA/m2. This study improves the understanding of electric current influence on heterotrophic denitrifying microorganisms and promotes the intelligent application of direct electrical stimulation on wastewater treatment processes.
机译：已经显示电流刺激对异养反硝化微生物活力具有积极影响，并且具有改善废水脱氮性能的可能性。本研究研究了不同电流密度对微生物活性和NO3的影响，在异养的条件下去除效率。在施加电流密度为400ΩmA/ m2的施加电流密度最高。然而，当电流密度在200℃/ m 2固定时，实现了总无机氮气（锡; 99％）的最佳去除效率。在该电流密度下也会使NH4 + -N和NO2α-N副产物的积累最小化。杂营性反硝化微生物的活性在200和400？MA / M2中高得多。此外，平均腺苷-5'-三磷酸（ATP）含量（ATP）含量（ATP）含量（ATP）的电流密度为1600ΩmA/ m2污染，表明在高电流密度下可以抑制异养的反硝化微生物活性。因此，在发达系统中的异养反硝化微生物活性的直接电刺激应低于1600？MA / M2。该研究改善了对异养反硝化微生物对电流影响的理解，促进直接电刺激对废水处理过程的智能应用。

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