Effect of hydrothermal pretreatment and compound microbial agents on compost maturity and gaseous emissions during aerobic composting of kitchen waste

Ting Xie; Zhaohan Zhang; Dawei Zhang; Chunzhong Wei; Yong Lin; Rongwei Feng; Jun Nan; Yujie Feng

doi:10.1016/j.scitotenv.2022.158712

Effect of hydrothermal pretreatment and compound microbial agents on compost maturity and gaseous emissions during aerobic composting of kitchen waste

Sci Total Environ. 2023 Jan 1:854:158712. doi: 10.1016/j.scitotenv.2022.158712. Epub 2022 Sep 11.

Authors

Ting Xie¹, Zhaohan Zhang², Dawei Zhang¹, Chunzhong Wei³, Yong Lin³, Rongwei Feng³, Jun Nan¹, Yujie Feng⁴

Affiliations

¹ State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China.
² State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China; Heilongjiang Provincial Key Laboratory of Polar Environment and Ecosystem, Harbin Institute of Technology, China.
³ Guangxi Beitou Environmental Protection & Water Group CO. LTO, Nanning, China.
⁴ State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China. Electronic address: yujief@hit.edu.cn.

PMID: 36099942
DOI: 10.1016/j.scitotenv.2022.158712

Abstract

Though aerobic composting is commonly used in kitchen waste (KW) disposal, the high-oil and high-salt characteristics of KW could affect composting efficiency and lead to the land using risk of produced fertilizer. The impact of hydrothermal pretreatment (HTP) and addition of compound microbial agent (CMA) on compost maturity, greenhouse gas (GHGs) emissions and bacterial community during the kitchen waste composting were evaluated in the present work. Results indicated that N₂O, CH₄ and CO₂ emissions from treatment by HTP and CMA addition were reduced by 82.72%, 13.77% and 20.78 %, respectively, comparing with the control (without HTP and without CMA addition). The seed germination index (GI) value of the HTP and CMA addition treatment was 1.03 and had the highest maturity in all treatments. Furthermore, the bacterial community analysis indicated that CMA inoculation could increase the relative abundance of genus Bacillus at the thermophilic stage of composting to accelerate organic biodegradation. This work provided important insight into mitigating GHGs emissions and improving compost quality in kitchen waste composting.

Keywords: Composting; Compound microbial agent; Greenhouse gases; Hydrothermal pretreatment; Kitchen waste.

MeSH terms

Composting* / methods
Gases / analysis
Greenhouse Gases*
Soil

Substances

Gases
Soil
Greenhouse Gases