Characteristics of a Copper-cadmium Tolerant Strain Screened from Tailings and Its Potential in Remediation of Heavy Metal Contaminated Soil

• Published in: Water, air, and soil pollution air, and soil pollution, 2023-04, Vol.234 (4), p.277-277, Article 277
• Main Authors: Wang, Nannan, Wang, Yufan, Li, Bingbing, Huang, Fei, Sun, Chuanhao, Li, Xintong, Zhao, Ran, Wang, Youbao
• Format: Article
• Language: English
• Subjects: Agricultural land; agricultural soils; air; Atmospheric Protection/Air Quality Control/Air Pollution; beta-fructofuranosidase; Bioremediation; Cadmium; Catalase; China; Climate Change/Climate Change Impacts; Copper; Earth and Environmental Science; Electrical conductivity; Electrical resistivity; Environment; Environmental monitoring; Growth; Heavy metals; Hydrogeology; Invertase; Mine tailings; Minimum inhibitory concentration; Phytoremediation; pollution; Pseudomonas aeruginosa; rRNA 16S; Soil analysis; Soil conductivity; Soil contamination; soil electrical conductivity; Soil pollution; Soil properties; Soil remediation; Soil Science & Conservation; Soils; Tailings; temperature; water; Water Quality/Water Pollution
• ISSN: 0049-6979; 1573-2932
• DOI: 10.1007/s11270-023-06296-7

In this study, we have screened out a copper-cadmium tolerant strain K1 from the farmland soil of Laoyaling tailings in Tongling City, Anhui Province, China. The strain was identified as Pseudomonas aeruginosa by 16S rDNA sequencing. To reveal its influence on pollution remediation, the growth characteristics of strain K1 and its effects on soil properties were analyzed. The minimum inhibitory concentration (MIC) of strain K1 toward copper and cadmium was 996.70 mg·L −1 and 313.81 mg·L −1 , respectively. The optimal growth pH of K1 strain was 7.0 and the optimal temperature was 30℃. Interestingly, we found that the growth of strain K1 increased the environmental pH. The removal rates of copper and cadmium in solution by the stain were 32.44% and 34.05%, respectively. By application of strain K1, the soil electrical conductivity (EC) reduced from 0.46 ms·cm −1 to 0.40 ms·cm −1 ; the contents of available copper and cadmium in the soil decreased by 34.89% and 17.88%; the activities of soil catalase and invertase were also significantly improved. In conclusion, the indigenous strain K1 showed significant resistance to heavy metals and could be expected to be used as a potential remediation agent or phytoremediation enhancer toward the heavy metal contaminated soil in tailings.