Composting pig manure with nano-zero-valent iron amendment: Insights into the carbon cycle and balance

Xu Yang; Ronghua Li; You Li; Mahmoud Mazarji; Jingwen Wang; Xiu Zhang; Dan Song; Yajing Wang; Zengqiang Zhang; Yadong Yang; Junting Pan

doi:10.1016/j.biortech.2023.128615

Composting pig manure with nano-zero-valent iron amendment: Insights into the carbon cycle and balance

Bioresour Technol. 2023 Mar:371:128615. doi: 10.1016/j.biortech.2023.128615. Epub 2023 Jan 11.

Authors

Xu Yang¹, Ronghua Li¹, You Li², Mahmoud Mazarji³, Jingwen Wang¹, Xiu Zhang⁴, Dan Song⁵, Yajing Wang³, Zengqiang Zhang¹, Yadong Yang³, Junting Pan⁶

Affiliations

¹ College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
² Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
³ Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
⁴ North Minzu University Ningxia Key Laboratory for the Development and Application of Microbial Resources in Extreme Environments, Yinchuan 750021, China.
⁵ Chongqing Academy of Ecology and Environmental Sciences, Chongqing 401147, China.
⁶ Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China. Electronic address: panjunting@caas.cn.

PMID: 36640823
DOI: 10.1016/j.biortech.2023.128615

Abstract

The effectiveness of nano-zero-valent-iron (NZVI) addition during composting of pig manure (PM) was investigated. Different dosages of NZVI were mixed with PM substrate during a 50 days composting process. The results revealed that the higher share of NZVI addition, the higher OM degradation rate is. On contrary, it was observed that the higher share of NZVI addition, the lower the fulvic acid and the humin degradation rate is. Meanwhile, NZVI amendment increased the CO₂ and CH₄ emissions by 29-47 % and 53-57 %, respectively. The in-depth analysis showed that NZVI addition increased the activity of Sphaerobacter and Luteimonas, which eventually led to the degradation of hard-to-degrade OM faster. Additionally, NZVI was found to increase the filtration of microorganisms, reducing the toxicity and hygiene of compost products. No significant improvement in humic substance enhancement was observed during composting with NZVI addition but improved OM degradation.

Keywords: C cycle; C loss; Compost; Nano-zero-valent iron.

MeSH terms

Animals
Carbon Cycle
Composting*
Iron* / chemistry
Manure
Soil
Swine

Substances

Iron
Soil
Manure