Impact of aeration rate on phosphorus conversion and bacterial community dynamics in phosphorus-enriched composting

Tiantian Ma; Yabin Zhan; Wenjie Chen; Shaoqi Xu; Zhigang Wang; Yueyue Tao; Xiong Shi; Baoru Sun; Guochun Ding; Ji Li; Yuquan Wei

doi:10.1016/j.biortech.2022.128016

Impact of aeration rate on phosphorus conversion and bacterial community dynamics in phosphorus-enriched composting

Bioresour Technol. 2022 Nov:364:128016. doi: 10.1016/j.biortech.2022.128016. Epub 2022 Sep 23.

Authors

Tiantian Ma¹, Yabin Zhan², Wenjie Chen², Shaoqi Xu³, Zhigang Wang⁴, Yueyue Tao⁵, Xiong Shi⁶, Baoru Sun¹, Guochun Ding², Ji Li², Yuquan Wei⁷

Affiliations

¹ College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, 100193, Beijing, China.
² College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, 100193, Beijing, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, Suzhou 215128, China.
³ College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, 100193, Beijing, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, Suzhou 215128, China; DBN Agriculture Science and Technology Group CO, Ltd., DBN Pig Academy, Beijing 102629, China.
⁴ DBN Agriculture Science and Technology Group CO, Ltd., DBN Pig Academy, Beijing 102629, China.
⁵ Institute of Agricultural Sciences in Taihu Lake District, Suzhou Academy of Agricultural Sciences, Suzhou 215155, China.
⁶ Yangtze Eco-Environment Engineering Research Center, China Three Gorges Corporation, Beijing 100038, China.
⁷ College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, 100193, Beijing, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, Suzhou 215128, China. Electronic address: [email protected].

PMID: 36162785
DOI: 10.1016/j.biortech.2022.128016

Abstract

This study was to investigate the effects of different aeration rates on phosphorus (P) conversion and bacterial community dynamics in P-enriched composting by 16S rRNA gene sequencing, sequential P fractionation, network analysis and structural equation model (SEM). Results indicated that Olsen P content increased by 138 %, 150 %, 121 % after composting with aeration rate (L kg^-1 DM min^-1) at 0.2 (AR0.2), 0.4 (AR0.4) and 0.6 (AR0.6). AR0.4 was more conducive to enhance P solubilization efficacy and available P accumulation. Redundancy analysis indicated Lactobacillus, Spartobacteria and Pseudomonas were key bacteria associated with HCl-Pi especially in AR0.2 and AR0.4. Network analysis showed that increased aeration rate enhanced the connection and function homoplasy among modules and AR0.4 had more orderly community organization for key bacteria to solubilize P in directly and indirectly biotic way. SEM suggested indirectly biotic P-solubilization had more contribution than directly biotic way mainly by phosphate-solubilizing bacteria.

Keywords: Biotic pathways; Food waste compost; Phosphate-solubilizing bacteria (PSB) inoculation; Phylogenetic molecular ecological networks (pMENs); Rock phosphate (RP) solubilization.