A secret of high-rate mass transfer in anammox granular sludge: "Lung-like breathing"

Water Research
Dongdong XuPing Zheng

Abstract

The granulation of anaerobic ammonium oxidation (Anammox) biomass can play a key role in developing stable and high-rate working of anammox process. It is important to know the working mechanism of anammox granular sludge (AnGS) for the optimization of reactor performance. In this study, a "lung-like breathing" determinator was invented to investigate the working behavior of AnGS in the bioreactor. The results showed that the AnGS had a regular expansion and contraction phenomenon, which was called "lung-like breathing". With the biological loading rate (BLR) at 0.114 kg-N/(kg-VSS·d), the expansion and contraction amplitude (ExCA) was 1.29 ± 0.05%, and the expansion and contraction frequency (ExCF) was 39.3 ± 1.6 times/h. The AnGS cultivated in a bioreactor with higher nitrogen removal rate (NRR) was found to have the higher ExCA and ExCF when determinated at the same BLR, and the "lung-like breathing" behavior of one type of AnGS was revealed to bear a significantly (p < 0.05) positive correlation with the specific anammox activity (SAA). The mass transfer flux from "lung-like breathing" was far greater than that from molecular diffusion, which was regarded as a vital mechanism for the AnGS to demonstrate its high activity. Th...Continue Reading

Citations

Apr 20, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Wen-Jie MaRen-Cun Jin
Nov 18, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Guangxue WuQidong Yin
Sep 18, 2020·Bioresource Technology·Jinyuan MaKaijun Wang
Jul 31, 2021·The Science of the Total Environment·Dongdong XuPing Zheng
Aug 11, 2021·The Science of the Total Environment·Chao PanPing Zheng

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