Bioprecipitation of Toxic Metal Ions by Highly Metal-Resistant Dissimilatory Sulfate-Reducing Bacteria using Pressmud Hydrolysate as Growth Substrate
Bioprecipitation of Toxic Metal Ions by Highly Metal-Resistant Dissimilatory Sulfate-Reducing Bacteria using Pressmud Hydrolysate as Growth Substrate
Muhammad Muneeb1, Ali Hussain2*, Qurat-ul-Ain Ahmad3, Arshad Javid1 and Jibran Hussain3
ABSTRACT
Environmental impact of metallic ions is well studied thus necessitates their removal from anthropogenically impacted regions. Chemical neutralization is frequently employed but has drawbacks such producing secondary pollutants and being expensive. Exploitation of metals-resistant sulfate-reducing bacteria in biological waste management offers benefits such as decreased secondary pollution, lower costs, and improved performance. The current study is focused on using pressmud hydrolysate as source of energy and carbon for sulfate-reducing bacteria to precipitate toxic metal ions from effluent. Results have shown that the bioprecipitation of Cd was minimal (37% at 5 ppm and no precipitation at 20 ppm), while Cu showed maximum bioprecipitation at lower concentrations (91% at 5 ppm) but reduced effectiveness at higher concentrations (13% at 20 ppm). Cr had the least negative impact on SRB and could efficiently precipitate higher concentrations of this metal (99% at 5 ppm and 17% at 20 ppm). This study also discussed the influence of growth environment including temperature and pH, on the remediation potential of the microbes. Optimal temperature of 30°C and pH of 7.0 ± 0.5 were found to be favorable for effective metal ion removal. The outcomes of present study will contribute for designing the effective bioremedial systems to be used for the mitigation of metal pollution.
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