Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, USA.
The College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
Bioresour Technol. 2019 Dec;294:122176. doi: 10.1016/j.biortech.2019.122176. Epub 2019 Sep 21.
Autotrophic denitrification under acidic conditions using sulfide (S), elemental sulfur (S), and thiosulfate (SO) as electron donors are evaluated. Results from batch and column experiments show that when different S species were supplied, different pH conditions and denitrifier communities were required for denitrification to occur. Nitrate and nitrite were removed via autotrophic denitrification at pH ranging from 4 to 8, when S or SO was the electron donor, while with S denitrification was only observed at pH > 6. When S was used as electron donor, it was converted to S, and S was not used while S was available. When addition of S was discontinued, or S depleted, S that had accumulated was used as electron donor for denitrification. These findings demonstrate that sulfur-based autotrophic denitrification can proceed under acidic conditions, but that the addition of appropriate S species and the presence of an effective denitrifier community are required.
利用硫化物（S）、元素硫（S）和硫代硫酸盐（SO）作为电子供体进行酸性条件下的自养反硝化作用的评估。批式和柱式实验的结果表明，当提供不同的 S 物种时，需要不同的 pH 值条件和反硝化菌群落才能发生反硝化作用。当 S 或 SO 作为电子供体时，硝酸盐和亚硝酸盐可以通过 pH 值在 4 到 8 之间的自养反硝化作用去除，而当 S 进行反硝化作用时，仅观察到 pH 值>6。当 S 用作电子供体时，它会转化为 S，而 S 可用时则不会使用 S。当停止添加 S 或 S 耗尽时，积累的 S 被用作反硝化作用的电子供体。这些发现表明，基于硫的自养反硝化作用可以在酸性条件下进行，但需要添加适当的 S 物种和存在有效的反硝化菌群落。
