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首页> 外文期刊>Applied Microbiology and Biotechnology >Minimizing nitrous oxide in biological nutrient removal from municipal wastewater by controlling copper ion concentrations
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Minimizing nitrous oxide in biological nutrient removal from municipal wastewater by controlling copper ion concentrations

机译：通过控制铜离子浓度，最大限度地减少市政污水中生物营养去除中的一氧化二氮

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In this study, nitrous oxide (N_2O) production during biological nutrient removal (BNR) from municipal wastewater was reported to be remarkably reduced by controlling copper ion (Cu~(2+)) concentration. Firstly, it was observed that the addition of Cu~(2+) (10-100 μg/L) reduced N_2O generation by 54.5-73.2 % and improved total nitrogen removal when synthetic wastewater was treated in an anaerobic-aerobic (with low dissolved oxygen) BNR process. Then, the roles of Cu2+ were investigated. The activities of nitrite and nitrous oxide reductases were increased by Cu2+ addition, which accelerated the bio-reductions of both nitrite to nitric oxide (NO _2 - → NO) and nitrous oxide to nitrogen gas (N_2O → N_2). The quantitative real-time polymerase chain reaction assay indicated that Cu ~(2+) addition increased the number of N_2O reducing denitrifiers. Further investigation showed that more polyhydoxyalkanoates were utilized in the Cu~(2+)-added system for denitrification. Finally, the feasibility of reducing N_2O generation by controlling Cu~(2+) was examined in two other BNR processes treating real municipal wastewater. As the Cu~(2+) in municipal wastewater is usually below 10 μg/L, according to this study, the supplement of influent Cu~(2+) to a concentration of 10-100 μg/L is beneficial to reduce N2O emission and improve nitrogen removal when sludge concentration in the BNR system is around 3,200 mg/L.
机译：在这项研究中，据报道，通过控制铜离子（Cu〜（2+））的浓度，从城市废水中去除生物营养物（BNR）时产生的一氧化二氮（N_2O）明显减少。首先，当在厌氧-好氧（低溶解度）处理合成废水时，观察到Cu〜（2+）（10-100μg/ L）的添加将N_2O的生成减少了54.5-73.2％，并提高了总氮的去除率。氧气）BNR工艺。然后，研究了Cu2 +的作用。 Cu2 +的加入增加了亚硝酸盐和一氧化二氮还原酶的活性，加速了亚硝酸盐向一氧化氮（NO _2-→NO）和一氧化二氮向氮气（N_2O→N_2）的生物还原。实时定量聚合酶链反应定量分析表明，添加Cu〜（2+）增加了还原N_2O的反硝化剂的数量。进一步的研究表明，在添加Cu〜（2+）的体系中使用了更多的聚羟基链烷酸酯进行反硝化。最后，在另外两个处理实际市政废水的BNR工艺中，研究了通过控制Cu〜（2+）减少N_2O生成的可行性。由于市政废水中的Cu〜（2+）通常低于10μg/ L，因此，根据本研究，将流入的Cu〜（2+）补充至10-100μg/ L的浓度有利于减少N2O排放当BNR系统中的污泥浓度约为3200 mg / L时，可提高脱氮率。

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