Department of Chemical & Environmental Engineering, School of Science, Shenyang University of Technology, Shenyang 110870, China E-mail:
Water Sci Technol. 2019 Aug;80(4):634-643. doi: 10.2166/wst.2019.277.
The effects of nitrite and nitrate on the integration of ammonium oxidization and sulfate reduction were investigated in a self-designed reactor with an effective volume of 5 L. An experimental study indicated that the ammonium oxidization and sulfate reduction efficiencies were increased in the presence of nitrite and nitrate. Studies showed that a decreasing proportion of N/S in the presence of NO at 30 mg·L would lead to high removal efficiencies of NH -N and SO -S of up to 78.13% and 46.72%, respectively. On the other hand, NO was produced at approximately 26.89 mg·L. Proteobacteria, Chloroflexi, Bacteroidetes, Chlorobi, Acidobacteria, Planctomycetes and Nitrospirae were detected in the anaerobic cycle growth reactor. Proteobacteria was identified as the dominant functional bacteria removing nitrogen in the reactor. The nitritation reaction could promote the sulfate-reducing ammonium oxidation (SRAO) process. NH was converted to NO and other intermediates, for which the electron acceptor was SO . These results showed that nitrogen was converted by the nitrification process, the denitrification process, and the traditional anammox process simultaneously with the SRAO process. The sulfur-based autotrophic denitration and denitrification in the reactor were caused by the influent nitrite and nitrate.
采用有效容积为 5 L 的自设计反应器，研究了亚硝酸盐和硝酸盐对氨氧化和硫酸盐还原一体化的影响。实验研究表明，亚硝酸盐和硝酸盐的存在会提高氨氧化和硫酸盐还原的效率。研究表明，在 30mg·L 的 NO 存在下，N/S 的比例降低会导致 NH -N 和 SO -S 的去除效率分别高达 78.13%和 46.72%。另一方面，NO 的产量约为 26.89mg·L。在厌氧循环生长反应器中检测到了变形菌门、绿弯菌门、拟杆菌门、绿菌门、酸杆菌门、浮霉菌门和硝化螺旋菌门。确定变形菌门是反应器中去除氮的主要功能细菌。亚硝化反应可以促进硫酸盐还原氨氧化（SRAO）过程。NH 被转化为 NO 和其他中间体，其电子受体是 SO 。这些结果表明，氮通过硝化过程、反硝化过程和传统的厌氧氨氧化过程与 SRAO 过程同时转化。反应器中的基于硫的自养反硝化和脱硝是由进水的亚硝酸盐和硝酸盐引起的。
