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Xiao Z, Fang Q, Zhou W, Ding W, Zhu J, Guo X, Liang G. Enhanced hydrolysis of waste activated sludge and recovery of volatile fatty acids: Performance and mechanistic analysis of synergistic treatment with sodium citrate and calcium oxide. BIORESOURCE TECHNOLOGY 2024; 407:131143. [PMID: 39043280 DOI: 10.1016/j.biortech.2024.131143] [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: 03/27/2024] [Revised: 06/30/2024] [Accepted: 07/19/2024] [Indexed: 07/25/2024]
Abstract
Anaerobic fermentation has emerged as a promising method of transforming waste activated sludge into high-value products (e.g., volatile fatty acids (VFAs)). This work developed sodium citrate (SC)-calcium oxide (CaO) pretreatment to accelerate the production of VFAs by enhancing sludge solubilization and disintegration of extracellular polymeric substances. The results showed that co-pretreatment with 0.25 g/g TSS of SC and 0.05 g/g TSS of CaO effectively boosted VFAs accumulation (5823.3 mg COD/L), which was 12.2 times higher than the Control group. SC-CaO pretreatment enhanced hydrolysis and acidogenesis by providing ample organic substrates, thereby promoting the growth of hydrolytic and acidogenic bacteria. Additionally, the fermentation broth resulting from co-pretreatment exhibited lower phosphorus concentration and higher biodegradability. Economic analysis confirmed that the combined pretreatment is cost-effective. This work provides a viable strategy for enhancing high-value product recovery from sludge.
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Affiliation(s)
- Zilong Xiao
- Department of Municipal Engineering, College of Civil and Transportation Engineering, Guangzhou University, Guangzhou, PR China
| | - Qian Fang
- Department of Municipal Engineering, College of Civil and Transportation Engineering, Guangzhou University, Guangzhou, PR China.
| | - Wuyang Zhou
- Department of Municipal Engineering, College of Civil and Transportation Engineering, Guangzhou University, Guangzhou, PR China; Research Center, Guangzhou Municipal Engineering Design & Research Institute CO., Ltd, Guangzhou, PR China
| | - Wenxue Ding
- Guangzhou Sciencecity Drainage Management CO., Ltd, Guangzhou, PR China
| | - Jiang Zhu
- Department of Municipal Engineering, College of Civil and Transportation Engineering, Guangzhou University, Guangzhou, PR China
| | - Xiaomin Guo
- Department of Municipal Engineering, College of Civil and Transportation Engineering, Guangzhou University, Guangzhou, PR China
| | - Guirong Liang
- Department of Municipal Engineering, College of Civil and Transportation Engineering, Guangzhou University, Guangzhou, PR China
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Wang Y, Zhao J, Fu Z, Guan D, Zhang D, Zhang H, Zhang Q, Xie J, Sun Y, Wang D. Innovative overview of the occurrence, aging characteristics, and ecological toxicity of microplastics in environmental media. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 346:123623. [PMID: 38387545 DOI: 10.1016/j.envpol.2024.123623] [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: 11/17/2023] [Revised: 02/16/2024] [Accepted: 02/19/2024] [Indexed: 02/24/2024]
Abstract
Microplastics (MPs), pollutants detected at high frequency in the environment, can be served as carriers of many kinds of pollutants and have typical characteristics of environmental persistence and bioaccumulation. The potential risks of MPs ecological environment and health have been widely concerned by scholars and engineering practitioners. Previous reviews mostly focused on the pollution characteristics and ecological toxicity of MPs, but there were few reviews on MPs analysis methods, aging mechanisms and removal strategies. To address this issue, this review first summarizes the contamination characteristics of MPs in different environmental media, and then focuses on analyzing the detection methods and analyzing the aging mechanisms of MPs, which include physical aging and chemical aging. Further, the ecotoxicity of MPs to different organisms and the associated enhanced removal strategies are outlined. Finally, some unresolved research questions related to MPs are prospected. This review focuses on the ageing and ecotoxic behaviour of MPs and provides some theoretical references for the potential environmental risks of MPs and their deep control.
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Affiliation(s)
- Yuxin Wang
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266520, PR China
| | - Jianwei Zhao
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266520, PR China.
| | - Zhou Fu
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266520, PR China
| | - Dezheng Guan
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266520, PR China
| | - Dalei Zhang
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266520, PR China
| | - Hongying Zhang
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266520, PR China
| | - Qi Zhang
- Qingdao Jiebao Ecological Technology Co., Ltd., Qingdao, 266000, PR China
| | - Jingliang Xie
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266520, PR China
| | - Yingjie Sun
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266520, PR China
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, PR China
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Zhang J, Wang Q, Yu H, Lin L, Zhang Z, Song Y. Metagenomic insights into protein degradation mechanisms in natural fermentation of cassava leaves. BIORESOURCE TECHNOLOGY 2024; 396:130433. [PMID: 38342281 DOI: 10.1016/j.biortech.2024.130433] [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: 10/20/2023] [Revised: 02/05/2024] [Accepted: 02/06/2024] [Indexed: 02/13/2024]
Abstract
Cassava (Manihot esculenta Crantz) leaves, the primary by-product of cassava processing, constitute a significant protein source, accounting for 18 to 38 percent on a dry weight basis. Despite their nutritional value, a substantial portion of these leaves is often discarded post-harvest, resulting in notable resource waste. This study employs metagenomic technology to investigate the protein degradation mechanism in cassava leaves, aiming to provide a technical reference for value-added of this by-product. Following a 36-hour period of natural fermentation, the protein degradation rate reached 58%, a phenomenon intricately linked to both the microbial community structure and its functional properties. Notably, Lactococcus and Enterobacter, recognized for their abundant protease activity, were predominant. Metagenomically assembled genomes further revealed Lactococcus's substantial role in producing flavors and active compounds, including amino acids and peptides. This study offers novel perspectives to the foodization and high-value utilization of cassava by-products, emphasizing the sustainable exploitation of biomass resources.
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Affiliation(s)
- Jinquan Zhang
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Hainan Province, Haikou 571101, China; College of Horticulture, Hunan Agricultural University, Hunan Province, Changsha 410000, China
| | - Qinfei Wang
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Hainan Province, Haikou 571101, China
| | - Houmei Yu
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Hainan Province, Haikou 571101, China
| | - Liming Lin
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Hainan Province, Haikou 571101, China
| | - Zhenwen Zhang
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Hainan Province, Haikou 571101, China.
| | - Yong Song
- College of Horticulture, Hunan Agricultural University, Hunan Province, Changsha 410000, China.
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Fu Z, Zhao J, Guan D, Wang Y, Xie J, Zhang H, Sun Y, Zhu J, Guo L. A comprehensive review on the preparation of biochar from digestate sources and its application in environmental pollution remediation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168822. [PMID: 38043821 DOI: 10.1016/j.scitotenv.2023.168822] [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: 09/05/2023] [Revised: 11/21/2023] [Accepted: 11/22/2023] [Indexed: 12/05/2023]
Abstract
The preparation of biochar from digestate is one of the effective ways to achieve the safe disposal and resource utilization of digestate. Nevertheless, up to now, a comprehensive review encompassing the factors influencing anaerobic digestate-derived biochar production and its applications is scarce in the literature. Therefore, to fill this gap, the present work first outlined the research hotspots of digestate in the last decade using bibliometric statistical analysis with the help of VOSviewer. Then, the characteristics of the different sources of digestate were summarized. Furthermore, the influencing factors of biochar preparation from digestate and the modification methods of digestate-derived biochar and associated mechanisms were analyzed. Notably, a comprehensive synthesis of anaerobic digestate-derived biochar applications is provided, encompassing enhanced anaerobic digestion, heavy metal remediation, aerobic composting, antibiotic/antibiotic resistance gene removal, and phosphorus recovery from digestate liquor. The economic and environmental impacts of digestate-derived biochar were also analyzed. Finally, the development prospect and challenges of using biochar from digestate to combat environmental pollution are foreseen. The aim is to not only address digestate management challenges at the source but also offer a novel path for the resourceful utilization of digestate.
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Affiliation(s)
- Zhou Fu
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
| | - Jianwei Zhao
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China.
| | - Dezheng Guan
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
| | - Yuxin Wang
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
| | - Jingliang Xie
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
| | - Huawei Zhang
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
| | - Yingjie Sun
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China.
| | - Jiangwei Zhu
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
| | - Liang Guo
- Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China
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Hu F, Fu N, Wei Q, Liu S, Hu Y, Zhang S, Wang X, Peng X, Dai H, Wei Y. Effect of alkali pretreatment time on kitchen waste anaerobic digestion performance enhanced by alkali pretreatment combined with bentonite: performance enhancement, microbial community structure, and functional gene analysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:7167-7178. [PMID: 38157170 DOI: 10.1007/s11356-023-31646-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 12/17/2023] [Indexed: 01/03/2024]
Abstract
Kitchen waste was mainly composed of carbohydrates, lipids, and proteins. Anaerobic digestion (AD) of kitchen waste usually occurred acidification and further deteriorated. In our previous study, alkali pretreatment combined with bentonite (AP/Be) treatment was proved to enhance high solid AD of kitchen waste. However, effects of AP time on AP/Be were not yet studied. This study investigated the effects of AP time on AP/Be treatment on enhancing high solid AD. The results showed that compared with the control group, the cumulative methane production rate could be increased by 3.30 times (149.7 mL CH4/g VS) and the volatile solids (VS) reduction rate increased by 63.36%. Microbial community analysis showed that the relative abundance of Methanosarcina and Methanosaeta were increased from 6.49 and 7.83% to 47.14 and 16.39% respectively. Predictive functional analysis showed that AP/Be treatment increased the abundance of energy production and conversion, coenzyme transport, and metabolism. This study revealed the potential mechanism of AP/Be enhanced kitchen waste AD performance and AP/Be was a potential strategy to strengthen AD.
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Affiliation(s)
- Fengping Hu
- School of Civil Engineering and Architecture, East China JiaoTong University, Nanchang, 330013, China
| | - Ningxin Fu
- School of Civil Engineering and Architecture, East China JiaoTong University, Nanchang, 330013, China
| | - Qun Wei
- School of Civil Engineering and Architecture, East China JiaoTong University, Nanchang, 330013, China
| | - Susu Liu
- School of Civil Engineering and Architecture, East China JiaoTong University, Nanchang, 330013, China.
- Jiangxi Province Zhonggantou Survey and Design Co., Ltd, Nanchang, 330000, China.
| | - Yuying Hu
- School of Civil Engineering and Architecture, East China JiaoTong University, Nanchang, 330013, China
| | - Shihao Zhang
- School of Civil Engineering and Architecture, East China JiaoTong University, Nanchang, 330013, China
| | - Xin Wang
- School of Civil Engineering and Architecture, East China JiaoTong University, Nanchang, 330013, China
| | - Xiaoming Peng
- School of Civil Engineering and Architecture, East China JiaoTong University, Nanchang, 330013, China
| | - Hongling Dai
- School of Civil Engineering and Architecture, East China JiaoTong University, Nanchang, 330013, China
| | - Yang Wei
- School of Civil Engineering and Architecture, East China JiaoTong University, Nanchang, 330013, China
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