Effect of high salinity in wastewater on surface properties of anammox granular sludge

Chemosphere
Fang FangJin Song Guo

Abstract

Bacterial surface properties fundamentally affect the stability and aggregation of anammox granular sludge. The variation in the surface properties of the granular sludge at different salinities were investigated to further clarify the effect of salinity on the aggregation of anammox granular sludge in this study. High anammox activity was obtained at a salinity of 30 g/L NaCl, and the average removal efficiency of NH4+N, NO2--N and TN reached 91.9% ± 1.4%, 97.3% ± 0.4% and 86.3% ± 0.9%, respectively. The sludge particle size in Reactor 1 (with 0 g/L NaCl as control) and Reactor 2 (with 0, 15 and 30 g/L NaCl) increased from 1.62 ± 0.16 mm and 1.59 ± 0.12 mm to 2.71 ± 0.23 mm and 2.44 ± 0.19 mm, respectively, during total operation. PN gradually decreased from 30.58 ± 2.5 mg/g to 18.11 ± 2.1 mg/g, and PS sharply increased from 1.48 ± 0.09 mg/g to 10.52 ± 0.50 mg/g with the increase in salinity. The PS/PN ratio of extracellular polymeric substances (EPS) rapidly increased from 0.05 to 0.58 with an increase of salinity. Fourier transform infra-red spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) results showed that salinity inhibited the expression of anammox sludge hydrophobicity by changing surface groups. Binding ...Continue Reading

Citations

Jan 29, 2019·Journal of Industrial Microbiology & Biotechnology·Han WangJi-Xiang Yang
May 30, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Lijing BaiDan Wang
Mar 17, 2020·Frontiers in Microbiology·Maria Cristina GaglianoCaroline M Plugge
Mar 27, 2021·Environmental Technology·Fan YangYu Shen
Jul 19, 2021·The Science of the Total Environment·Victory Fiifi DsaneYounggyun Choi

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