Journal
JOURNAL OF CLEANER PRODUCTION
Volume 257, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2020.120535
Keywords
Adsorption; Biodegradation; Phosphate-solubilizing bacteria; Co-metabolism
Categories
Funding
- MOA Modern Agricultural Talents Support Project
- National Natural Science Foundation of China [41877128]
- Plan for Training Talents with Special Funds for the Development of Local Colleges and Universities by Central Finance
- National Natural Science Fund for Distinguished Young Scholars [41625002]
- Young Talents Project of Northeast Agricultural University [18QC13]
- Heilongjiang Provincial Key Laboratory of Soil Protection and Remediation
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At present, the soil is facing serious problems of reduced nutrient utilization and organic pollution. In this study, a straw-based biochar BC550 with four phosphate-solubilizing bacteria and Acinetobacter lwoffii DNS32, a degrading bacteria of herbicide atrazine were co-cultured as a combined application to improve soil available phosphorus while repairing the atrazine contaminated soil. The porous structure and surface characteristics of BC550 ensures its ability to adsorb atrazine and is beneficial to the phosphorus solubilization of phosphate-solubilizing bacteria. Phosphate-solubilizing bacteria could use the intermediate metabolites produced during the degradation of atrazine by strain DNS32 to grow and secrete low molecular weight organic acids to promote the expression of atrazine-degrading genes trzN, atzB, and atzC in strain DNS32. The addition of BC550 directly increases the total and available phosphorus content in the soil, and may further stimulate degradation by concentrating of atrazine in proximity of the degrading bacteria on the biochar surface. The combined application showed 49% higher ability to degrade 100 mg L-1 atrazine within 24 h and 27% higher ability to degrade 20 mg kg(-1) atrazine within 3 days than pure degrading bacteria DNS32, in liquid and soil experiments, respectively. This research will help provide a promising in situ remediation technique to improve the quality of the soil environment. (C) 2020 Elsevier Ltd. All rights reserved.
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