Application of the biogas residue of anaerobic co-digestion of gentamicin mycelial residues and wheat straw as soil amendment: Focus on nutrients supply, soil enzyme activities and antibiotic resistance genes. (1st June 2023)

• Record Type: Journal Article
• Authors: Song, Siqi; Jiang, Mingye; Liu, Huiling; Dai, Xiaohu; Wang, Peng
• Is Part Of: Journal of environmental management. Volume 335(2023)
• Publication Date: 2023-06-01
• Subjects: Biogas residue -- Gentamicin mycelial residues -- Amendment -- Random forest model -- Antibiotic resistance genes; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2023.117512
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Land utilization of the biogas residue (BR) produced by anaerobic co-digestion of gentamicin mycelial residues (GMRs) and wheat straw is a promising method to achieve the deep recycling of GMRs. This study evaluated the feasibility and efficacy of application of using BR as a soil amendment by using a pot experiment. Results indicated that BR could improve the soil fertility better than commercial chicken manure fertilizer (CMF) in terms of the soil enzyme activities and nutrients supply. Random Forest (RF) model was applied to predict soil enzyme activities and identify key influencing factors. Combining the Random Forest (RF) model with the Three-dimensional Excitation–emission Matrix and Parallel Factor (3D-EEM-PARAFAC) analysis, revealing that humic-like substances provided by BR protected soil enzymes, thus improving soil fertility. Furthermore, gentamicin and antibiotic resistance genes (ARGs)/mobile genetic elements (MEGs) introduced by BR decreased greatly after cultivation, implying a low risk of antimicrobial resistance. This study suggested that reasonable application of BR could improve soil nutrients supply, soil enzyme activity and control antimicrobial resistance risk. Graphical abstract: Image 1 Highlights: BR increased the supply of soil nutrients and humic-acid substances. BR performed better than CMF in the enhancement of soil enzyme activities. RF model combined with EEM-PARAFAC was first applied in the cultivation process. Microbial analysis indicated BR had more readily biodegradable matters than CMF. Long cultivation cycle favored gentamicin degradation and ARGs attenuation.