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首页> 外文期刊>Environmental Engineering Science >Sequential Nitrification and Denitrification in a Divided Cell Attached Growth Bioelectrochemical Reactor
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Sequential Nitrification and Denitrification in a Divided Cell Attached Growth Bioelectrochemical Reactor

机译：分隔细胞附着生长生物电化学反应器中的顺序硝化和反硝化

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摘要

A divided cell bioelectrochemical reactor comprised of two upflow submerged columns packed with Celite biocarrier was operated to generate oxic and anoxic compartments where the nitrified effluent from the first column was denitrified in the second for sequential nitrification-denitrification of a simulated waste-water. The experiments were carried out at current intensities of 0.5 mA/cm~2 and 1.0 mA/cm~2 over six phases. The wastewater pH decreased after contacting the oxic (nitrifying) compartment due to the acid equivalents produced electrolytically and during biological nitrification. The wastewater pH subsequently increased after contacting the anoxic (denitrifying) compartment due to the base equivalents produced electrolytically and the acid equivalents consumed during denitrification. At a current intensity of 0.5 mA/cm~2, up to 56% of the influent nitrogen was removed on average during Phases Ⅰ to Ⅲ prior to operating at a higher current density. The nitrogen removal efficiency dropped to 15% at a current density of 1.0 mA/cm~2 because of the pH inhibition and excess gases produced in the nitrification column. The reactor system did not recover from the inhibition.
机译：操作由两个装有硅藻土生物载体的上流式浸没柱组成的分隔式细胞生物电化学反应器，以产生有氧和无氧区室，第一个塔的硝化流出物在第二个池中进行硝化，以便对模拟废水进行连续硝化-反硝化。实验在六个阶段中分别在0.5 mA / cm〜2和1.0 mA / cm〜2的电流强度下进行。接触含氧（硝化）室后，废水的pH降低，这是由于电解产生的酸当量以及生物硝化过程中产生的。接触到缺氧（反硝化）室后，废水的pH随后升高，这是由于电解产生的碱当量和反硝化过程中消耗的酸当量。在电流强度为0.5 mA / cm〜2的情况下，在较高的电流密度下进行操作之前，在阶段Ⅰ至阶段Ⅲ中，平均会去除多达56％的流入氮。由于pH值的抑制和硝化塔中产生的过量气体，在1.0 mA / cm〜2的电流密度下，脱氮效率降至15％。反应器系统没有从抑制中恢复。

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