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Feng X, Zhang L. Composite additives regulate physicochemical and microbiological properties in green waste composting: A comparative study of single-period and multi-period addition modes. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 365:121677. [PMID: 38963955 DOI: 10.1016/j.jenvman.2024.121677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 05/10/2024] [Accepted: 06/27/2024] [Indexed: 07/06/2024]
Abstract
Composting additives can significantly enhance green waste (GW) composting. However, their effectiveness is limited due to the short action duration of a single-period addition. Therefore, this study proposes that multi-period additive modes to prolong the action duration, expedite lignocellulose degradation, reduce composting time, and enhance product quality. This study conducted six treatments (T1-T6), introducing a compound additive (BLP) during the mesophilic (MP) and cooling periods (CP). Each treatment consistently maintained 25% total BLP addition of GW dry weight, with variations only in the BLP distribution in different periods. The composition of BLP consists of Wbiochar: Wlactic acid: Wpond sediment in a ratio of 10:1:40. Specifically, T1 added 25% BLP in CP, T2 added 5% in MP and 20% in CP, T3 added 10% in MP and 15% in CP, T4 added 15% in MP and 10% in CP, T5 added 20% in MP and 5% in CP, and T6 added 25% in MP. In this study, composting temperature, pH value, electrical conductivity, total porosity, the contents of lignin, cellulose, hemicellulose, and nutrient, scanning electron microscopy images, germination index, and the successions of different bacteria and fungi at the phylum and genus levels were detailed. Results showed T4 achieved two thermophilic periods and matured in just 25 days. T4 enhanced lignocellulose degradation rates (lignin: 16-53%, cellulose: 14-23%, hemicellulose: 9-48%) and improved nutrient content. The above results, combined with correlation analysis and structural equation model, indicated that T4 may promote the development of dominant bacteria (Proteobacteria, Firmicutes, Actinobacteria, Bacteroidetes) by regulating compost physicochemical properties and facilitate the growth of dominant fungi (Ascomycota and Basidiomycota) by modulating nutrient supply capacity. This ultimately leads to a microbial community structure more conducive to lignocellulose degradation and nutrient preservation. In summary, this study reveals the comprehensive effects of single-period and multi-period addition methods on GW composting, providing a valuable basis for optimizing the use of additives and enhancing the efficiency and quality of GW composting.
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Affiliation(s)
- Xueqing Feng
- College of Forestry, Beijing Forestry University, Beijing, 100083, PR China.
| | - Lu Zhang
- College of Forestry, Beijing Forestry University, Beijing, 100083, PR China.
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2
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Lu M, Hao Y, Lin B, Huang Z, Zhang Y, Chen L, Li K, Li J. The bioaugmentation effect of microbial inoculants on humic acid formation during co-composting of bagasse and cow manure. ENVIRONMENTAL RESEARCH 2024; 252:118604. [PMID: 38548254 DOI: 10.1016/j.envres.2024.118604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 02/27/2024] [Accepted: 02/28/2024] [Indexed: 06/07/2024]
Abstract
The effective degradation of recalcitrant lignocellulose has emerged as a bottleneck for the humification of compost, and strategies are required to improve the efficiency of bagasse composting. Bioaugmentation is a promising method for promoting compost maturation and improving the quality of final compost. In this study, the bioaugmentation effects of microbial inoculants on humic acid (HA) formation during lignocellulosic composting were explored. In the inoculated group, the maximum temperature was increased to 72.5 °C, and the phenol-protein condensation and Maillard humification pathways were enhanced, thus increasing the HA content by 43.85%. After inoculation, the intensity of the microbial community interactions increased, particularly for fungi (1.4-fold). Macrogenomic analysis revealed that inoculation enriched thermophilic bacteria and lignocellulose-degrading fungi and increased the activity of carbohydrate-active enzymes and related metabolic functions, which effectively disrupted the recalcitrant structure of lignocellulose to achieve a high humification degree. Spearman correlation analysis indicated that Stappia of the Proteobacteria phylum, Ilumatobacter of the Actinomycetes phylum, and eleven genera of Ascomycota were the main HA producers. This study provides new ideas for bagasse treatment and recycling and realizing the comprehensive use of resources.
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Affiliation(s)
- Mengling Lu
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, Guangxi, China
| | - Yuhao Hao
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, Guangxi, China
| | - Binfeng Lin
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, Guangxi, China
| | - Zhi Huang
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, Guangxi, China
| | - Yu Zhang
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, Guangxi, China
| | - Liang Chen
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, Guangxi, China
| | - Kai Li
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, Guangxi, China
| | - Jianbin Li
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, Guangxi, China; Academy of Sugarcane and Sugar Industry, Guangxi University, Nanning 530004, Guangxi, China.
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3
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Yao X, Liu Q, Li D. Mechanism underlying effects of cellulose-degrading microbial inoculation on amino acid degradation and biosynthesis during composting. BIORESOURCE TECHNOLOGY 2024; 403:130899. [PMID: 38801951 DOI: 10.1016/j.biortech.2024.130899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 05/23/2024] [Accepted: 05/24/2024] [Indexed: 05/29/2024]
Abstract
Amino acids are essential organic compounds in composting products. However, the mechanism underlying the amino acid metabolism during composting remains unclear. This study aims at exploring the impacts of inoculating cellulose-degrading microbes on amino acid metabolism during composting with mulberry branches and silkworm excrements. Cellulose-degrading microbial inoculation enhanced amino acid degradation by 18%-43% by increasing protease and sucrase activities and stimulating eight amino acid degradation pathways from the initial to thermophilic phases, with Enterococcus, Saccharomonospora, Corynebacterium being the dominant bacterial genera, but stimulated amino acid production by 54% by increasing sucrase and urease activities, decreasing β-glucosidase activities, and stimulating twenty-two amino acid synthesis pathways at the mature phase, with Thermobifida, Devosia, and Cellulosimicrobium being the dominant bacterial genera. The results suggest that cellulose-degrading microbial inoculation enhances amino acid degradation from the initial to thermophilic phases and biosynthesis at the mature phase, thereby improving the quality of organic fertilizer.
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Affiliation(s)
- Xiaofang Yao
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; Guangxi Industrial Technology Research Institute for Karst Rocky Desertification Control, Nanning 530012, China; Huanjiang Agriculture Ecosystem Observation and Research Station of Guangxi, Guangxi Key Laboratory of Karst Ecological Processes and Services, Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang 547100, Guangxi, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Qiumei Liu
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; Guangxi Industrial Technology Research Institute for Karst Rocky Desertification Control, Nanning 530012, China; Huanjiang Agriculture Ecosystem Observation and Research Station of Guangxi, Guangxi Key Laboratory of Karst Ecological Processes and Services, Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang 547100, Guangxi, China.
| | - Dejun Li
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; Guangxi Industrial Technology Research Institute for Karst Rocky Desertification Control, Nanning 530012, China; Huanjiang Agriculture Ecosystem Observation and Research Station of Guangxi, Guangxi Key Laboratory of Karst Ecological Processes and Services, Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang 547100, Guangxi, China.
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4
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Du S, Ding S, Wen X, Yu M, Zou X, Wu D. Investigating inhibiting factors affecting seed germination index in kitchen waste compost products: Soluble carbon, nitrogen, and salt insights. BIORESOURCE TECHNOLOGY 2024; 406:130995. [PMID: 38885720 DOI: 10.1016/j.biortech.2024.130995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 06/12/2024] [Accepted: 06/14/2024] [Indexed: 06/20/2024]
Abstract
The seed germination index (GI) serves as the principal determinant that impedes the integration of aerobic composting products into agricultural lands. The current research work predominantly focuses on exploring the correlation between physical and chemical indicators of the compost products and GI, neglecting the fundamental cause. This study systematically analyzed the composition of GI aqueous extracts from compost products derived from kitchen waste under various composting methodologies, with nitrogen, carbon, and inorganic salt as critical factors. The analytical work concluded that acetic acid, formic acid, and ammonium were the inhibitory factors influencing GI. Validation experiments introduced inhibitory factors, yielding a functional relationship formula depicting GI variations due to a single influential factor. This study conclusively identified acetic acid as the primary constraint, establishing that its inhibitory concentration corresponded to 70 % GI stands at 85 mg/L. This study will provide guidelines for the future research on enhancing aerobic composting techniques.
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Affiliation(s)
- Shuwen Du
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
| | - Shang Ding
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
| | - Xin Wen
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
| | - Mengwen Yu
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
| | - Xixuan Zou
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
| | - Donglei Wu
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
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5
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Zhu L, Tan C, Wang X, Liu L, Dong C, Qi Z, Zhang M, Hu B. Low-intensity alternating ventilation achieves effective humification during food waste composting by enhancing the intensity of microbial interaction and carbon metabolism. CHEMOSPHERE 2024; 357:142099. [PMID: 38653398 DOI: 10.1016/j.chemosphere.2024.142099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 04/10/2024] [Accepted: 04/20/2024] [Indexed: 04/25/2024]
Abstract
Vertical static composting is an efficient and convenient technology for the treatment of food waste. Exploring the impact of oxygen concentration levels on microbial community structure and functional stability is crucial for optimizing ventilation technology. This study set three experimental groups with varying ventilation intensities based on self-made alternating ventilation composting reactor (AL2: 0.2 L kg-1 DM·min-1; AL4: 0.4 L kg-1 DM·min-1; AL6: 0.6 L kg-1 DM·min-1) to explore the optimal alternating ventilation rate. The results showed that the cumulative ammonia emission of AL2 group reduced by 25.13% and 12.59% compared to the AL4 and AL6 groups. The humification degree of the product was 1.18 times and 1.25 times higher than the other two groups. AL2 increased the relative abundance of the core species Saccharomonospora, thereby strengthening microbial interaction. Low-intensity alternating ventilation increased the carbon metabolism levels, especially aerobic_chemoheterotrophy, carbohydrate and lipid metabolism. However, it simultaneously reduced nitrogen metabolism. Structural equation model analysis demonstrated that alternating low-intensity ventilation effectively regulated both microbial diversity (0.81, p < 0.001) and metabolism (0.81, p < 0.001) by shaping the composting environment. This study optimized the intensity of alternating ventilation and revealed the regulatory mechanism of community structure and metabolism. This study provides guidance for achieving efficient and low-consumption composting.
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Affiliation(s)
- Lin Zhu
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, Hangzhou, China; College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Chunxu Tan
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xiaohan Wang
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Liyuan Liu
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Chifei Dong
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Zhenyu Qi
- Agricultural Experiment Station, Zhejiang University, Hangzhou 310058, China
| | - Meng Zhang
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, China
| | - Baolan Hu
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, Hangzhou, China; College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, China.
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6
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Zhu L, Wang X, Liu L, Le B, Tan C, Dong C, Yao X, Hu B. Fungi play a crucial role in sustaining microbial networks and accelerating organic matter mineralization and humification during thermophilic phase of composting. ENVIRONMENTAL RESEARCH 2024; 254:119155. [PMID: 38754614 DOI: 10.1016/j.envres.2024.119155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2024] [Revised: 05/14/2024] [Accepted: 05/14/2024] [Indexed: 05/18/2024]
Abstract
Fungi play an important role in the mineralization and humification of refractory organic matter such as lignocellulose during composting. However, limited research on the ecological role of fungi in composting system hindered the development of efficient microbial agents. In this study, six groups of lab-scale composting experiments were conducted to reveal the role of fungal community in composting ecosystems by comparing them with bacterial community. The findings showed that the thermophilic phase was crucial for organic matter degradation and humic acid formation. The Richness index of the fungal community peaked at 1165 during this phase. PCoA analysis revealed a robust thermal stability in the fungal community. Despite temperature fluctuations, the community structure, predominantly governed by Pichia and Candida, remained largely unaltered. The stability of fungal community and the complexity of ecological networks were 1.26 times and 5.15 times higher than those observed in bacterial community, respectively. Fungi-bacteria interdomain interaction markedly enhanced network complexity, contributing to maintain microbial ecological functions. The core fungal species belonging to the family Saccharomycetaceae drove interdomain interaction during thermophilic phase. This study demonstrated the key role of fungi in the composting system, which would provide theoretical guidance for the development of high efficiency composting agents to strengthen the mineralization and humification of organic matter.
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Affiliation(s)
- Lin Zhu
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, Hangzhou, China; College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xiaohan Wang
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Liyuan Liu
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Boyi Le
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Chunxu Tan
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Chifei Dong
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xiangwu Yao
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Baolan Hu
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, Hangzhou, China; College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, China.
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7
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Wang Y, Yu Q, Zheng C, Wang Y, Chen H, Dong S, Hu X. The impact of microbial inoculants on large-scale composting of straw and manure under natural low-temperature conditions. BIORESOURCE TECHNOLOGY 2024; 400:130696. [PMID: 38614144 DOI: 10.1016/j.biortech.2024.130696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 04/10/2024] [Accepted: 04/10/2024] [Indexed: 04/15/2024]
Abstract
Understanding large-scale composting under natural conditions is essential for improving waste management and promoting sustainable agriculture. In this study, corn straw (400 tons) and pig manure (200 tons) were composted with microbial inoculants. The thermophilic phase of composting lasted for fourteen weeks, resulting in an alkaline final product. Microbial systems with low-temperature initiation and high-temperature fermentation played a crucial role in enhancing lignocellulose degradation and humic substances (HS) formation. Adding microbes, including Rhodanobacter, Pseudomonas, and Planococcus, showed a positive correlation with degradation rates of cellulose, hemicellulose, and lignin. Bacillus, Planococcus, and Acinetobacter were positively correlated with HS formation. Microorganisms facilitated efficient hydrolysis of lignocelluloses, providing humic precursors to accelerate composting humification through phenolic protein and Maillard pathways. This study provides significant insights into large-scale composting under natural conditions, contributing to the advancement of waste management strategies and the promotion of sustainable agriculture.
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Affiliation(s)
- Yanping Wang
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Qi Yu
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Chuang Zheng
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Yanbo Wang
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Heshu Chen
- Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China
| | | | - Xiaomei Hu
- College of Life Science, Northeast Agricultural University, Harbin 150030, China.
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8
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Zhu L, Zhao Y, Chen S, Miao X, Fang Z, Yao X, Dong C, Hu B. Alternating ventilation accelerates the mineralization and humification of food waste by optimizing the temperature-oxygen-moisture distribution in the static composting reactor. BIORESOURCE TECHNOLOGY 2024; 393:130050. [PMID: 37989420 DOI: 10.1016/j.biortech.2023.130050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 11/06/2023] [Accepted: 11/15/2023] [Indexed: 11/23/2023]
Abstract
Traditional unidirectional ventilation often leads to the loss of heat and moisture during composting, disrupting the favorable microenvironment required for aerobic microbes. This study developed a pulse alternating ventilation composting reactor and investigated the effects of alternating ventilation on composting efficiency compared with upward ventilation and downward ventilation. The results demonstrated that alternating ventilation stabilized the moisture content at approximately 60 % while reducing the temperature and oxygen concentration range within the reactor. Moreover, it extended the duration of high-temperature (>50 °C) by 31 % and 75 % compared to other two groups. It improved the microbial cooperation intensity and stimulated the core microbe (Tepidimicrobium). Seed germination index (GI) of the compost was improved (GI = 91.27 %), and the humic acid content was 1.23 times and 1.37 times higher than other two groups. These results showed that alternating ventilation can be used for efficient resource disposal of food waste.
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Affiliation(s)
- Lin Zhu
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yuxiang Zhao
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Siyin Chen
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xinyin Miao
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Zhou Fang
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xiangwu Yao
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Chifei Dong
- College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Baolan Hu
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, Hangzhou, China; College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, China.
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9
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Yu Y, Wang S, Yu P, Wang D, Hu B, Zheng P, Zhang M. A bibliometric analysis of emerging contaminants (ECs) (2001-2021): Evolution of hotspots and research trends. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 907:168116. [PMID: 37884150 DOI: 10.1016/j.scitotenv.2023.168116] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 10/05/2023] [Accepted: 10/23/2023] [Indexed: 10/28/2023]
Abstract
Emerging contaminants (ECs) have attracted increasing attention in the past two decades because of their ubiquitous existence and high environmental risk. Understanding the progress of research and the evolution of hot topics is critical. This study provides a bibliometric review, along with a quantitative trend analysis of approximately 8000 publication records dated from 2001 to 2021. Wider distribution in various subjects was discovered in terms of publication numbers, indicating a strong tendency for EC research to become an interdisciplinary topic. Visualization of term co-occurrence analysis revealed that the ECs study went through three stages over time: identification and detection, traceability and risk, and process and control. Quantitative trend analysis revealed that antibiotics, microplastics, endocrine disrupting chemicals (EDCs), per/poly-fluoroalkyl substances (PFAS), pesticides, heavy metals, and nanoparticles are attracting increasing attention, whereas conventional pharmaceuticals, persistent organic pollutants, and materials such as benzotriazole, diclofenac, bisphenol A, carbamazepine, triclosan, and titanium dioxide exhibit a downward trend. PFAS and EDCs are considered potential future core hotspots for the hysteretic rise in research attention compared with conventional ECs. Furthermore, analysis of research linkage and the developing stages of ECs could be possible approach to determine the evolution of hotspots in ECs study. This study provides objective and comprehensive insights into the research landscape of ECs, which may shed light on future developmental directions for researchers interested in this field.
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Affiliation(s)
- Yang Yu
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, China
| | - Siyu Wang
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, Singapore
| | - Pingfeng Yu
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, China; Innovation Center of Yangtze River Delta, Zhejiang University, Jiashan 314100, China
| | - Dongsheng Wang
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, China; Innovation Center of Yangtze River Delta, Zhejiang University, Jiashan 314100, China
| | - Baolan Hu
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, China
| | - Ping Zheng
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, China
| | - Meng Zhang
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, China; Innovation Center of Yangtze River Delta, Zhejiang University, Jiashan 314100, China.
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10
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Li D, Jiang W, Ye Y, Luo J, Zhou X, Yang L, Guo G, Wang S, Liu Z, Guo W, Ngo HH. A change in substance and microbial community structure during the co-composting of kitchen waste anaerobic digestion effluent, sewage sludge and Chinese medicine residue. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 907:167679. [PMID: 37848150 DOI: 10.1016/j.scitotenv.2023.167679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 09/26/2023] [Accepted: 10/06/2023] [Indexed: 10/19/2023]
Abstract
Anaerobic digestion is a resource recovery method for organic waste, gaining attention due to carbon reduction. Disposing of anaerobic digestion effluent (ADE) is crucial for developing anaerobic digestion, but conventional wastewater treatment fails to effectively recover nutrients contained in the ADE. In the present study, the ADE without solid-liquid separation was mixed with sewage sludge and Chinese medicine residue for the composting, where the ADE could be recovered at high temperature through humification. Besides, the nitrogen balance, humification process, and microbial dynamics during the composting process were studied. The results showed that the group supplemented with ADE could increase the nitrogen retention efficiency by 2.21 % compared to the control group. High ammonia nitrogen content and salinity did not negatively affect the maturity and phytotoxicity of compost products and even increase the humification degree of compost products. Moreover, additional ADE may not alter microbial community structure, which could contribute to microbial succession. This is the first time to investigate the substance transformation and shift in microbial community structure while applying composting process for ADE treatment, in which the anaerobic-aerobic collaborative disposal process provides an alternative solution for the recovery of ADE.
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Affiliation(s)
- Dian Li
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan 430074, China
| | - Wei Jiang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan 430074, China.
| | - Yuanyao Ye
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan 430074, China.
| | - Jiwu Luo
- Central & Southern China Municipal Engineering Design and Research Institute Co, Ltd., No. 8 Jiefang Park Rord, Wuhan 430010, China
| | - Xiaojuan Zhou
- Central & Southern China Municipal Engineering Design and Research Institute Co, Ltd., No. 8 Jiefang Park Rord, Wuhan 430010, China
| | - Lin Yang
- Wuhan Huantou Solid Waste Operation Co., Ltd., No. 37 Xinye Road, Wuhan 430024, China
| | - Gang Guo
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan 430074, China
| | - Songlin Wang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan 430074, China
| | - Zizheng Liu
- School of Civil Engineering, Wuhan University, No. 8 Donghu South Road, Wuhan 430072, China
| | - Wenshan Guo
- School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NWS 2007, Australia
| | - Huu Hao Ngo
- School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NWS 2007, Australia
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11
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Chang Y, Zhou K, Yang T, Zhao X, Li R, Li J, Xu S, Feng Z, Ding X, Zhang L, Shi X, Su J, Li J, Wei Y. Bacillus licheniformis inoculation promoted humification process for kitchen waste composting: Organic components transformation and bacterial metabolic mechanism. ENVIRONMENTAL RESEARCH 2023; 237:117016. [PMID: 37657603 DOI: 10.1016/j.envres.2023.117016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 08/24/2023] [Accepted: 08/27/2023] [Indexed: 09/03/2023]
Abstract
Kitchen waste (KW) composting always has trouble with slow humification process and low humification degree. The objective of this study was to develop potentially efficient solutions to improve the humification of KW composting, accelerate the humus synthesis and produce HS with a high polymerization degree. The impact of Bacillus licheniformis inoculation on the transformation of organic components, humus synthesis, and bacterial metabolic pathways in kitchen waste composting, was investigated. Results revealed that microbial inoculation promoted the degradation of organic constituents, especially readily degradable carbohydrates during the heating phase and lignocellulose fractions during the cooling phase. Inoculation facilitated the production and conversion of polyphenol, reducing sugar, and amino acids, leading to an increase of 20% in the content of humic acid compared to the control. High-throughput sequencing and network analysis indicated inoculation enriched the presence of Bacillus, Lactobacillus, and Streptomyces during the heating phase, while suppressing the abundance of Pseudomonas and Oceanobacillus, enhancing positive microbial interactions. PICRUSt2 analysis suggested inoculation enhanced the metabolism of carbohydrates and amino acids, promoting the polyphenol humification pathway and facilitating the formation of humus. These findings provide insights for optimizing the humification process of kitchen waste composting by microbial inoculation.
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Affiliation(s)
- Yuan Chang
- 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
| | - Kaiyun Zhou
- 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
| | - Tianxue Yang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Xinyu Zhao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Ruoqi Li
- 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
| | - Jun Li
- 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
| | - Shaoqi Xu
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, 100193, Beijing, China
| | - Ziwei Feng
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, 100193, Beijing, China
| | - Xiaoyan Ding
- Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, Suzhou, 215128, China
| | - Longli Zhang
- Beijing VOTO Biotech Co.,Ltd, 100193, Beijing, China
| | - Xiong Shi
- Yangtze Eco-Environment Engineering Research Center, China Three Gorges Corporation, Beijing, 100038, China
| | - Jing Su
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing, 210042, China.
| | - Ji Li
- 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
| | - Yuquan Wei
- 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.
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Mi H, Shen C, Ding T, Zheng X, Tang J, Lin H, Zhou S. Identifying the role of array electrodes in improving the compost quality of food waste during electric field-assisted aerobic composting. BIORESOURCE TECHNOLOGY 2023; 388:129763. [PMID: 37704091 DOI: 10.1016/j.biortech.2023.129763] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 08/23/2023] [Accepted: 09/09/2023] [Indexed: 09/15/2023]
Abstract
Low composting temperature and long maturation periods are two major problems during food waste composting. In this study, a novel array-based electric field-assisted aerobic composting (Pin-EAC) process was tested on food waste compost. Pin-EAC increase the composting temperature to 69.3 °C, and improved the germination index by 15%. The Pin-EAC took at least 40% less time to reach the standard compost maturity. The fluorescent spectroscopy results showed that Pin-EAC could increase humic acid and fulvic acid by 33% and 37%, respectively. Pin-EAC could increase the diversity of thermophilic bacteria during composting. The co-occurrence network shown that Pin-EAC are more closely related to oxygen and temperature. This work has initially shown that the use of an electric field could improve food waste composting quality, suggesting that the Pin-EAC process is an effective strategy for high-water and high-oil organic solid waste aerobic composting.
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Affiliation(s)
- Huan Mi
- Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyi shan, 354300, China; Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Chang Shen
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Tingting Ding
- Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyi shan, 354300, China; Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Xincheng Zheng
- Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyi shan, 354300, China; Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Jiahuan Tang
- Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyi shan, 354300, China; Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
| | - Hao Lin
- Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyi shan, 354300, China; Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Shungui Zhou
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
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Ding S, Jiang L, Hu J, Huang W, Lou L. Microbiome data analysis via machine learning models: Exploring vital players to optimize kitchen waste composting system. BIORESOURCE TECHNOLOGY 2023; 388:129731. [PMID: 37704090 DOI: 10.1016/j.biortech.2023.129731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 08/24/2023] [Accepted: 09/05/2023] [Indexed: 09/15/2023]
Abstract
Composting, reliant on microorganisms, effectively treats kitchen waste. However, it is difficult to precisely understand the specific role of key microorganisms in the composting process by relying solely on experimental research. This study aims to employ machine learning models to explore key microbial genera and to optimize composting systems. After introducing a novel microbiome preprocessing approach, Stacking models were constructed (R2 is about 0.8). The SHAP method (SHapley Additive exPlanations) identified Bacillus, Acinetobacter, Thermobacillus, Pseudomonas, Psychrobacter, and Thermobifida as prominent microbial genera (Shapley values ranging from 3.84 to 1.24). Additionally, microbial agents were prepared to target the identified key genera, and experiments demonstrated that the composting quality score was 76.06 for the treatment and 70.96 for the control. The exogenous agents enhanced decomposition and improved compost quality in later stages. In summary, this study opens up a new avenue to identifying key microorganisms and optimizing the biological treatment process.
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Affiliation(s)
- Shang Ding
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, People's Republic of China
| | - Liyan Jiang
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, People's Republic of China
| | - Jiyuan Hu
- College of Computer Science and Technology, Zhejiang University, Hangzhou 310058, People's Republic of China
| | - Wuji Huang
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, People's Republic of China
| | - Liping Lou
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, People's Republic of China.
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Jiang L, Zhao Y, Yao Y, Lou J, Zhao Y, Hu B. Adding siderophores: A new strategy to reduce greenhouse gas emissions in composting. BIORESOURCE TECHNOLOGY 2023:129319. [PMID: 37315620 DOI: 10.1016/j.biortech.2023.129319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 06/10/2023] [Accepted: 06/10/2023] [Indexed: 06/16/2023]
Abstract
Microbial community is the primary driver causing the greenhouse gas emissions in composting. Thus, regulating the microbial communities is a strategy to reduce them. Here, two different siderophores (enterobactin and putrebactin) were added, which could bind and translocate iron by specific microbes, to regulate the composting communities. The results showed that adding enterobactin enriched Acinetobacter and Bacillus with specific receptors by 6.84-fold and 6.78-fold. It promoted carbohydrate degradation and amino acid metabolism. This resulted in a 1.28-fold increase in humic acid content, as well as a 14.02% and 18.27% decrease in CO2 and CH4 emissions, respectively. Meanwhile, adding putrebactin boosted the microbial diversity by 1.21-fold and enhanced potential microbial interactions by 1.76-fold. The attenuated denitrification process led to a 1.51-fold increase in the total nitrogen content and a 27.47% reduction in N2O emissions. Overall, adding siderophores is an efficient strategy to reduce greenhouse gas emissions and promote the compost quality.
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Affiliation(s)
- Liyan Jiang
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yuting Zhao
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yuqing Yao
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Jingxuan Lou
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yuxiang Zhao
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Baolan Hu
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Key Laboratory of Water Pollution Control and Environmental Safety of Zhejiang Province, Hangzhou310058, China.
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