Effect of microbial pretreatment on degradation of food waste and humus structure

Daichen Mu; Kexin Ma; Liangzi He; Zimin Wei

doi:10.1016/j.biortech.2023.129442

Effect of microbial pretreatment on degradation of food waste and humus structure

Bioresour Technol. 2023 Oct:385:129442. doi: 10.1016/j.biortech.2023.129442. Epub 2023 Jul 1.

Authors

Daichen Mu¹, Kexin Ma¹, Liangzi He¹, Zimin Wei²

Affiliations

¹ College of Life Science, Northeast Agricultural University, Harbin 150030, China.
² Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Sciences, Tianjin Normal University, Tianjin 300387, China. Electronic address: zmwei@tjnu.edu.cn.

PMID: 37399958
DOI: 10.1016/j.biortech.2023.129442

Abstract

The study aimed to investigate the pretreatment characteristics of food waste (FW) by Bacillus licheniformis and Bacillus oryzaecorticis, and to determine the contribution of microbial hydrolysis in the structure of fulvic acid (FA) and humic acid (HA). FW was pretreated with Bacillus oryzaecorticis (FO) and Bacillus licheniformis (FL), and the resulting solution was heated to synthesize humus. The results showed that the acidic substances produced by microbial treatments led to a decrease in pH. In addition, Bacillus oryzaecorticis degraded starch and released a large amount of reducing sugar, providing OH and COOH to FA molecules. Bacillus licheniformis showed a positive effect on the HA structure, which had higher OH, CH₃ and aliphatics. FO is more beneficial to retain OH and COOH, while FL is more beneficial to retain amino and aliphatics. This study provided evidence for the application of Bacillus licheniformis and Bacillus oryzaecorticis in waste management.

Keywords: Bacillus licheniformis; Bacillus oryzaecorticis; Humic acid; Pretreatment.

MeSH terms

Bacillus licheniformis*
Bacillus* / metabolism
Food
Humic Substances
Refuse Disposal*
Soil

Substances

Soil
Humic Substances

Supplementary concepts

Bacillus oryzaecorticis