Effects of inorganic salts on denitrifying granular sludge: The acute toxicity and working mechanisms

Bioresource Technology
Ru WangHe-Ping Zhao

Abstract

It is highly significant to investigate the toxicity of inorganic salts to denitrifying granular sludge (DGS) and its mechanism since the application of high-rate denitrification is seriously limited in the treatment of saline nitrogen-rich wastewaters. The batch experiments showed that the IC50 (half inhibition concentration) and LC50 (half lethal concentration) of NaCl, Na2SO4 and Na3PO4 on DGS were 11.46, 21.72, 7.46 g/L and 77.35, 100.58, 67.92 g/L respectively. Based on the analysis of specific denitrifying activity, the live cell percentage, the cell structure, and the DNA leakage, the toxicity of low salinity was ascribed to the inhibition of denitrifying activity and the toxicity of high salinity was ascribed to both the inhibition of denitrifying activity and the lethality of denitrifying cell.

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Citations

Sep 2, 2016·Journal of Biological Engineering·N SalmanikhasA Rashidi Mehrabadi
Feb 13, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Yu JiangHongyu Wang
Mar 2, 2017·Applied Microbiology and Biotechnology·Mengyao GuiJinren Ni
Aug 11, 2021·The Science of the Total Environment·Chao PanPing Zheng

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