Roles of MnO2 on performance, sludge characteristics and microbial community in anammox system

The Science of the Total Environment
Jia-Jia XuRen-Cun Jin

Abstract

The long-term impacts of MnO2 on performance, sludge characteristics and microbial community of biogranule-based anaerobic ammonium oxidation (anammox) process were evaluated in an up-flow anaerobic sludge blanket reactor. It was found that the total nitrogen removal efficiency of reactor was fluctuated between 90%-93% at 1-200mgL-1 MnO2. Notably, the specific anammox activity was increased to maximum value of 657.3±10.6mgTNg-1VSSd-1 at 50mgL-1 MnO2 and then slightly decreased, but still higher than that achieved at 0-15mgL-1 MnO2, which had similar variation trends to the content of heme c and extracellular polymeric substances in anammox granules. High throughput sequencing indicated that MnO2 could improve the microbial richness and diversity of anammox granules and Candidatus Kuenenia was always the dominant species, and its abundance continued to increase to 21.3% at the end of operational experiment. Therefore, MnO2 could be applied to enhance the anammox process and the optimal influent MnO2 concentration was lower than 50mgL-1 in view of the reactor performance and cost issues.

Citations

Feb 29, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Chong-Jian TangYunyan Wang
Nov 7, 2019·Critical Reviews in Biotechnology·Huan YiMingming Zhang
Feb 15, 2019·Journal of Environmental Management·Zhi-Hua LiHan-Qing Yu

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