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Wang Q, Li N, Jiang S, Li G, Yuan J, Li Y, Chang R, Gong X. Composting of post-consumption food waste enhanced by bioaugmentation with microbial consortium. Sci Total Environ 2024; 907:168107. [PMID: 37884139 DOI: 10.1016/j.scitotenv.2023.168107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 10/20/2023] [Accepted: 10/23/2023] [Indexed: 10/28/2023]
Abstract
There is escalating interest in composting of post-consumption food waste (PCFW) to recycle nutrients and mitigate pollution by inappropriate disposal. The present study aimed to evaluate the performance of bioaugmentation to composting of PCFW, which is in difficulties caused by high sugar, protein and gross lipid content. Inoculation of the microbial consortium effectively induced rapid temperature and pH rising, which led to OM reduction rate at 25.11 % and maturity at 150 % in terms of Germination Index value. EEMs-FRI showed that humification was accelerated in the thermophilic stage and further improved in the mature stage. Bacterial community analysis revealed that microbial inoculant ameliorated acidification, and expedited temperature and pH rising in the initial stage, which in turn accelerated bacteria community succession. The abundance of Actinobacteria was much higher in the thermophilic and mature stage in T2 treatment than in T1, which might explain rapid organic degradation. High temperature enriched thermophilic genera (Thermobifida, Compostibacillus, Neobacillus), and Pseudonocardia and Actinoplanes were enriched in the mature stage, which correlated to effective degradation of organic matter, humification and maturity. Temperature and pH mainly motivated bacterial succession. The results suggest that bioaugmentation is a favorable approach for efficient composting of PCFW.
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Affiliation(s)
- Qianqi Wang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Na Li
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; Ordos Environmental Protection Investment Co., Ltd, Ordos 017000, China
| | - Sinan Jiang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Guoxue Li
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Jing Yuan
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Yanming Li
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Ruixue Chang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Xiaoyan Gong
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
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Chen L, Li W, Zhao Y, Zhou Y, Zhang S, Meng L. Isolation and application of a mixotrophic sulfide-oxidizing Cohnella thermotolerans LYH-2 strain to sewage sludge composting for hydrogen sulfide odor control. Bioresour Technol 2022; 345:126557. [PMID: 34906701 DOI: 10.1016/j.biortech.2021.126557] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/07/2021] [Accepted: 12/08/2021] [Indexed: 06/14/2023]
Abstract
To investigate the influences of sulfide oxidizing bacteria on H2S odor control in sewage sludge composting, a facultative chemolithotroph strain was isolated and identified as Cohnella thermotolerans LYH-2. Strain LYH-2 decreased the initially added sulfide by 94.6% when glucose and NH4Cl were used as the optimal energy substrates. The biotransformation of sulfide substrates followed first-order reaction kinetics, and the highest degradation rate constant (0.0537 h-1) and bacterial dry weight (0.745 g/L) were obtained at 300 mg/L of initial sulfide. The C. thermotolerans strain was inoculated as the bacterial agent into the sewage sludge and rice husk composting in forced ventilation composting reactors for 25 d; the bacterial inoculation prolonged the thermophilic period by 2 d, decreased 35.4% of H2S odor emission, and accelerated the composting process compared to the control group. The results demonstrated that C. thermotolerans inoculants effectively controlled H2S emission and promoted maturity in sewage sludge composting.
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Affiliation(s)
- Li Chen
- School of Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | - Weiguang Li
- School of Environment, Harbin Institute of Technology, Harbin 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
| | - Yi Zhao
- School of Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | - Yujie Zhou
- School of Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | - Shumei Zhang
- Institute of Microbiology, Heilongjiang Academy of Sciences, Harbin 150010, PR China
| | - Liqiang Meng
- Institute of Microbiology, Heilongjiang Academy of Sciences, Harbin 150010, PR China
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