The impact of toxicity of metals on the activity of ureolytic mixed culture during the precipitation of calcium

Journal of Hazardous Materials
Yakup Kurmaç

Abstract

In this article, the inhibitory impact of metals on substrate utilization and microbial carbonate precipitation (MCP) by ureolytic mixed cultures (UMC) was investigated with glucose and mineral medium under batch conditions. The IC(50) (toxicant concentration eliciting 50% inhibitory effect) values were determined from the BOD values of samples. Inhibition, expressed as the value of 50% inhibitory effect (IC(50)), was evaluated by the decrease in substrate removal using BOD tests. The effect of toxicity of metals on substrate degradation, IC(50) values, was found to increase in the following order: Cd(II)>Cu(II)>Pb(II)>Cr(VI)>Ni(II)>Zn(II). Nitrification a possible phenomenon in the biocatalytic process was observed in several samples and this inhibited the precipitation of soluble calcium. During the removal of calcium from industrial calcium-rich wastewater, toxicity of metal at higher metal concentrations and possibility of nitrification at higher sludge ages should be considered.

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Citations

Feb 3, 2016·Frontiers in Bioengineering and Biotechnology·Tingting Zhu, Maria Dittrich
Oct 28, 2011·The Science of the Total Environment·Valeria Ochoa-HerreraReyes Sierra-Alvarez
Jul 6, 2010·Journal of Hazardous Materials·Evina KatsouKatherine Haralambous
Aug 5, 2016·The Journal of General and Applied Microbiology·Chang-Ho KangJae-Seong So
Jun 28, 2013·Biofouling·Adrienne J PhillipsLee Spangler
Aug 9, 2012·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Simos MalamisKatherine J Haralambous
Nov 9, 2020·The Science of the Total Environment·Bryce D StewartRoland Kröger

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