Promoting nitrogen conversion in aerobic biotransformation of swine slurry with the co-application of manganese sulfate and biochar.

Autor: Wu X; College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China., Zhao X; College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China., Yi G; College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China., Zhang W; College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China., Gao R; College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China., Tang DKH; The University of Arizona (UA), The Department of Environmental Science, Shantz Building Rm 4291177 E 4th St.Tucson, AZ, 85721, USA; College of Natural Resources and Environment, NWAFU-AU Microcampus, Yangling, Shaanxi, 712100, China. Electronic address: danielkhtang@arizona.edu., Xiao R; College of Resources and Environment, Southwest University, Chongqing, 400715, China., Zhang Z; College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China; College of Natural Resources and Environment, NWAFU-AU Microcampus, Yangling, Shaanxi, 712100, China; Key Laboratory of Low-carbon Green Agriculture in Northwestern China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi, 712100, China., Yao Y; Key Laboratory of Low-carbon Green Agriculture in Northwestern China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi, 712100, China; College of Mechanical & Electronic Engineering, Northwest Research Center Rural Renewable Energy Exploitation, Northwest A&F University, Yangling, 712100, Shaanxi, China., Li R; College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China; College of Natural Resources and Environment, NWAFU-AU Microcampus, Yangling, Shaanxi, 712100, China; Key Laboratory of Low-carbon Green Agriculture in Northwestern China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi, 712100, China. Electronic address: anrongli@nwsuaf.edu.cn.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2024 Apr; Vol. 356, pp. 120604. Date of Electronic Publication: 2024 Mar 21.
DOI: 10.1016/j.jenvman.2024.120604
Abstrakt: This study aimed to explore the co-application of MnSO 4 (Mn) and biochar (BC) in nitrogen conversion during the composting process. A 70-day aerobic composting was conducted using swine slurry, supplemented with different levels of Mn (0, 0.25%, and 0.5%) and 5% BC. The results demonstrated that the treatment with 0.5MnBC had the highest levels of NH 4 + -N (3.07 g kg -1 ), TKN (29.90 g kg -1 ), and NO 3 - -N (1.94 g kg -1 ) among all treatments. Additionally, the 0.5MnBC treatment demonstrated higher urease, protease, nitrate reductase, and nitrite reductase activities than the other treatments, with the peak values of 18.12, 6.96, 3.57, and 15.14 mg g -1 d -1 , respectively. The addition of Mn 2+ increased the total organic nitrogen content by 29.59%-47.82%, the acid hydrolyzed ammonia nitrogen (AN) content by 13.84%-57.86% and the amino acid nitrogen (AAN) content by 55.38%-77.83%. The richness of Chloroflexi and Ascomycota was also enhanced by the simultaneous application of BC and Mn. Structural equation modeling analysis showed that Mn 2+ can promote the conversion of Hydrolyzed Unknown Nitrogen (HUN) into AAN, and there is a positive association between urease and NH 4 + -N according to redundancy analysis. Firmicutes, Basidiomycota, and Mortierellomycota showed significant positive correlations with ASN, AN, and NH 4 + -N, indicating their crucial roles in nitrogen conversion. This study sheds light on promoting nitrogen conversion in swine slurry composting through the co-application of biochar and manganese sulfate.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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