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Bioenhanced remediation of dibutyl phthalate contaminated black soil by immobilized biochar microbiota. | LitMetric

AI Article Synopsis

  • A new bioremediation material (BHF@DK-P3) combining humic acid, iron-modified corn stover biochar, and beneficial bacteria was developed to tackle contamination from DBP residues in black soils.
  • The included microbiota, consisting of DBP-degrading and nutrient-solubilizing bacteria, formed a strong partnership that enhanced soil health and nutrient availability.
  • The application of BHF@DK-P3 improved soil structure and nutrient levels, increasing available phosphorus by 21.45%, potassium by 12.54%, and nitrogen by 14.74%, while stabilizing microbial functions under DBP and pH stress.

Article Abstract

To address the contamination caused by DBP residues prevalent in black soils, this study developed a multifunctional bioremediation material (BHF@DK-P3) using humic acid and iron-modified corn stover biochar in combination with microbiota. The microbiota contained DBP-degrading bacteria (Enterobacterium sp. DNB-S2), phosphorus-solubilizing bacteria (Enterobacter sp. P1) and potassium-solubilizing bacteria (Paenibacillus sp. KT), and formed a good mutualistic symbiosis. In the biochar microenvironment, the microflora had lower DBP biotoxicity responses and more cell membrane formation. The addition of BHF@DK-P3 brought the structure of the DBP-contaminated black soil closer to the optimal three-phase ratio. The microbiota was able to perform their biological functions stably under both DBP stress and acid-base stress conditions. The stability of soil aggregates and the efficiency of N, P, K nutrients were improved, with available phosphorus increasing by 21.45%, available potassium by 12.54% and alkali-hydrolysable nitrogen by 14.74%. The relative abundance of copiotrophic bacterial taxa in the soil increased and the relative abundance of oligotrophic bacterial taxa decreased, providing a good mechanism for the conversion and utilization of soil nutrients. Biochar and microbiota jointly influenced soil carbon and nitrogen metabolism in response to DBP.

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Source
http://dx.doi.org/10.1016/j.jenvman.2024.123317DOI Listing

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