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- Title
Immobilization Behavior and Mechanism of Cd 2+ by Sulfate-Reducing Bacteria in Anoxic Environments.
- Authors
Liao, Lang; Li, Qian; Yang, Yongbin; Xu, Rui; Zhang, Yan
- Abstract
It is vital to remove cadmium from wastewater because of its potential harm to the natural environment and human health. It was found that sulfate-reducing bacteria (SRB) had a good fixing effect on Cd under a strict anaerobic environment. However, there are few reports on the immobilization effect and mechanism of SRB on Cd in an anoxic environment. This study revealed the effects of initial Cd2+ concentration, initial SO42− concentration, temperature, pH, and C/N ratio on the immobilization of Cd2+ by SRB in aqueous solution under an anoxic environment. The experimental results showed that under the conditions of initial concentration of Cd2+ within 0 mg/L~30 mg/L, initial concentration of SO42− within 1200 mg/L, temperature within 25 °C~35 °C, pH neutral, and C/N ratio of 20:1, the immobilization rate of Cd2+ by SRB is above 90%. The characterization results showed that bioadsorption and chemical precipitation were the main mechanisms of SRB immobilization of Cd2+ in an anoxic environment.
- Subjects
SULFATE-reducing bacteria; PRECIPITATION (Chemistry); THERAPEUTIC immobilization; ANOXIC zones; AQUEOUS solutions; CADMIUM
- Publication
Water (20734441), 2024, Vol 16, Issue 8, p1086
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w16081086