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Zeng Y, Dong W, Wang H, Huang X, Li J. A novel strategy and mechanism for high-quality volatile fatty acids production from primary sludge: Peroxymonosulfate pretreatment combined with alkaline fermentation. ENVIRONMENTAL RESEARCH 2023; 217:114939. [PMID: 36435490 DOI: 10.1016/j.envres.2022.114939] [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: 10/19/2022] [Revised: 11/18/2022] [Accepted: 11/22/2022] [Indexed: 06/16/2023]
Abstract
To obtain high-quality VFAs production from primary sludge, a novel strategy that combined peroxymonosulfate (PMS) pretreatment and alkaline fermentation (i.e., PMS & pH9) was proposed in the study. The results showed that PMS & pH9 was efficient in sludge solubilization and hydrolysis, resulting in a maximal VFAs yield of 401.2 mg COD/g VSS, which was 7.3-, 2.1-, and 8.8-fold higher than the sole PMS, sole pH9, and control, respectively. Acetate comprised 87.6% of VFAs in this integration system. Mechanism investigations revealed that sulfate and free radicals produced by PMS play roles in improving VFAs yield under alkaline conditions. Besides, sulfate also aided in C3∼C5 VFAs converting to acetate under alkaline conditions depending on the increase of incomplete-oxidative sulfate-reducing bacteria (iso-SRB) (i.e., Desulfobulbus and Desulfobotulus). Moreover, the relative abundances of acid-forming characteristic genera (i.e., Proteiniborus, Proteinilcasticum, and Acetoanaerobium) were higher in PMS & pH9.
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Affiliation(s)
- Yuanxin Zeng
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China
| | - Wenyi Dong
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen, 518055, PR China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; Laboratory of Urban High Concentration Wastewater Treatment and Resource Utilization, Shenzhen, 518055, PR China
| | - Hongjie Wang
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen, 518055, PR China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; Laboratory of Urban High Concentration Wastewater Treatment and Resource Utilization, Shenzhen, 518055, PR China
| | - Xiao Huang
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China; Laboratory of Urban High Concentration Wastewater Treatment and Resource Utilization, Shenzhen, 518055, PR China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, PR China.
| | - Ji Li
- School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen, 518055, PR China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; Laboratory of Urban High Concentration Wastewater Treatment and Resource Utilization, Shenzhen, 518055, PR China
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2
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Ravi YK, Zhang W, Liang Y. Effect of surfactant assisted ultrasonic pretreatment on production of volatile fatty acids from mixed food waste. BIORESOURCE TECHNOLOGY 2023; 368:128340. [PMID: 36400272 DOI: 10.1016/j.biortech.2022.128340] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 11/12/2022] [Accepted: 11/14/2022] [Indexed: 06/16/2023]
Abstract
In this study, the potential effect of surfactant assisted ultrasonic pretreatment on mixed food waste was investigated. Surfactants, such as Rhamnolipid, Sodium dodecyl sulfate; Glucopon and Triton X 100 were evaluated in this work. Among them, the maximum solubilization of chemical oxygen demand of 45.5 % and the highest release of soluble COD of 31 g/L were observed for ultrasonication assisted by Triton X 100 at a dose of 0.01 g/g TS in 30 min. The presence of a surfactant also reduced 27.5 % of energy demand when compared to ultrasonic pretreatment alone. Compared to the non-pretreated samples after anaerobic digestion, ultrasonication assisted by Triton X 100 led to 95 % increase of volatile fatty acid titers and 83 % increase of carbon conversion efficiency. Thus, sonication with the addition of Triton X 100 was proven to be highly effective toward increasing digestibility of and yield of volatile fatty acid from mixed food waste.
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Affiliation(s)
- Yukesh Kannah Ravi
- Department of Environmental and Sustainable Engineering, University at Albany, State University of New York, 1400 Washington Avenue, Albany, NY 12222, USA.
| | - Weilan Zhang
- Department of Environmental and Sustainable Engineering, University at Albany, State University of New York, 1400 Washington Avenue, Albany, NY 12222, USA
| | - Yanna Liang
- Department of Environmental and Sustainable Engineering, University at Albany, State University of New York, 1400 Washington Avenue, Albany, NY 12222, USA
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3
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Intensification of Acidogenic Fermentation for the Production of Biohydrogen and Volatile Fatty Acids—A Perspective. FERMENTATION-BASEL 2022. [DOI: 10.3390/fermentation8070325] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Utilising ‘wastes’ as ‘resources’ is key to a circular economy. While there are multiple routes to waste valorisation, anaerobic digestion (AD)—a biochemical means to breakdown organic wastes in the absence of oxygen—is favoured due to its capacity to handle a variety of feedstocks. Traditional AD focuses on the production of biogas and fertiliser as products; however, such low-value products combined with longer residence times and slow kinetics have paved the way to explore alternative product platforms. The intermediate steps in conventional AD—acidogenesis and acetogenesis—have the capability to produce biohydrogen and volatile fatty acids (VFA) which are gaining increased attention due to the higher energy density (than biogas) and higher market value, respectively. This review hence focusses specifically on the production of biohydrogen and VFAs from organic wastes. With the revived interest in these products, a critical analysis of recent literature is needed to establish the current status. Therefore, intensification strategies in this area involving three main streams: substrate pre-treatment, digestion parameters and product recovery are discussed in detail based on literature reported in the last decade. The techno-economic aspects and future pointers are clearly highlighted to drive research forward in relevant areas.
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Ultrasonic Processing of Food Waste to Generate Value-Added Products. Foods 2022; 11:foods11142035. [PMID: 35885279 PMCID: PMC9319240 DOI: 10.3390/foods11142035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/04/2022] [Accepted: 07/06/2022] [Indexed: 02/04/2023] Open
Abstract
Ultrasonic processing has a great potential to transform waste from the food and agriculture industry into value-added products. In this review article, we discuss the use of ultrasound for the valorisation of food and agricultural waste. Ultrasonic processing is considered a green technology as compared to the conventional chemical extraction/processing methods. The influence of ultrasound pre-treatment on the soluble chemical oxygen demand (SCOD), particle size, and cell wall content of food waste is first discussed. The use of ultrasonic processing to produce/extract bioactives such as oil, polyphenolic, polysaccharides, fatty acids, organic acids, protein, lipids, and enzymes is highlighted. Moreover, ultrasonic processing in bioenergy production from food waste such as green methane, hydrogen, biodiesel, and ethanol through anaerobic digestion is also reviewed. The conversion of waste oils into biofuels with the use of ultrasound is presented. The latest developments and future prospective on the use of ultrasound in developing energy-efficient methods to convert food and agricultural waste into value-added products are summarised.
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Gao M, Li S, Zou H, Wen F, Cai A, Zhu R, Tian W, Shi D, Chai H, Gu L. Aged landfill leachate enhances anaerobic digestion of waste activated sludge. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 293:112853. [PMID: 34044237 DOI: 10.1016/j.jenvman.2021.112853] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Revised: 05/08/2021] [Accepted: 05/18/2021] [Indexed: 06/12/2023]
Abstract
Anaerobic digestion (AD) is considered as a sustainable pathway to recover energy from organic wastes, but the digestive efficiency for waste activated sludge (WAS) is not as expected due to the limitations in WAS hydrolysis. This study proposes an effective strategy to simultaneously treat WAS and landfill leachate, aiming to promote WAS hydrolysis and enhance organics converting to methane. The effects of landfill leachate on the four stages (i.e., solubilization, hydrolysis, acidogenesis, and methanogenesis) of AD of WAS, as well as the effect mechanisms were investigated. Results showed that adding appropriate amounts of landfill leachate could promote the steps of solubilization, hydrolysis and acidogenesis of WAS, but had no-effect on methanogenesis. The hydrolysis and acidogenesis efficiency in the leachate added digesters were 2.0%-8.4% and 35.2%-72.7% higher than the control digester. Mechanism studies indicated that humic acid (HA) contained in the leachate was conducive to the processes of both hydrolysis and acidogenesis, but detrimental to the methanogenesis. Effects of heavy metals (HMs) on AD of WAS was also dose-dependent. Digestive performance was inhibited by excessive HMs but promoted by moderate dosages. Humic acid and metal ions tend to interact to form complexes, and thus relieve their each inhibition effects. It is also found that the stability of sludge flocs was reduced by the leachate through reducing both apparent activation energy (AAE) and median particle size (MPS) of the sludge. Microbial community and diversity results revealed that the relative abundance of microbes responsible for hydrolysis and acidogenesis increased when landfill leachate was present. This research provides a more technically and economically feasible approach to co-treating and co-utilizing WAS and landfill leachate.
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Affiliation(s)
- Meng Gao
- Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing, 400045, PR China
| | - Siqi Li
- Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing, 400045, PR China
| | - Huijing Zou
- Hunan Architectural Design Institute Co., Ltd, Hunan, 410125, PR China
| | - Fushan Wen
- Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing, 400045, PR China
| | - Anrong Cai
- Chongqing Yuxi Water Co., Ltd, Chongqing, 400045, PR China
| | - Ruilin Zhu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing, 400045, PR China
| | - Wenjing Tian
- Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing, 400045, PR China
| | - Dezhi Shi
- Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing, 400045, PR China
| | - Hongxiang Chai
- Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing, 400045, PR China
| | - Li Gu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing, 400045, PR China.
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6
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Ma H, Lin Y, Jin Y, Gao M, Li H, Wang Q, Ge S, Cai L, Huang Z, Van Le Q, Xia C. Effect of ultrasonic pretreatment on chain elongation of saccharified residue from food waste by anaerobic fermentation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 268:115936. [PMID: 33158614 DOI: 10.1016/j.envpol.2020.115936] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 10/03/2020] [Accepted: 10/24/2020] [Indexed: 06/11/2023]
Abstract
Converting biowaste into value-added products has raised the researchers' interests. In this study, bioconversion was applied to produce chain acids from food waste by anaerobic fermentation. To improve the caproic acid production, different pretreatments (i.e., ultrasonic, hydrothermal, and alkaline-thermal) were used for investigating their effects on the acidogenic production and microbial communities. The results showed that ultrasonic and hydrothermal pretreatments (207.8 and 210.1 mg COD/g VS, respectively) were very efficient for enhancing the caproic acid production, compared to the alkaline-thermal pretreated samples and control samples (72.6 and 97.5 mg COD/g VS, respectively). The ultrasonic pretreatment was beneficial for reducing volatile fatty acids (VFAs) during the caproic acid production, resulting in converting more lactic acid to caproic acid by adding the hydrothermal pretreatment. The microbial community analysis showed that the acidogenic bacteria Caproiciproducens dominated the fermentation in this bioconversion process of food waste into chain acids. The Caproiciproducens mainly degraded the proteins and carbohydrates from the saccharified residues of food waste to produce caproic acids through chain elongation procedure. The investigation and optimized method may help develop the bioconversion technology for producing VFAs products from food wastes.
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Affiliation(s)
- Hongzhi Ma
- Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China
| | - Yujia Lin
- Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China
| | - Yong Jin
- Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China
| | - Ming Gao
- Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China
| | - Hongai Li
- Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China
| | - Qunhui Wang
- Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China
| | - Shengbo Ge
- Co-Innovation Center of Efficient Processing and Utilization of Forestry Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu, 210037, China
| | - Liping Cai
- Co-Innovation Center of Efficient Processing and Utilization of Forestry Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu, 210037, China; Department of Mechanical Engineering, University of North Texas, Denton, TX, 76207, USA
| | - Zhenhua Huang
- Department of Mechanical Engineering, University of North Texas, Denton, TX, 76207, USA
| | - Quyet Van Le
- Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam
| | - Changlei Xia
- Co-Innovation Center of Efficient Processing and Utilization of Forestry Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu, 210037, China.
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7
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Enhance biological nitrogen and phosphorus removal in wastewater treatment process by adding food waste fermentation liquid as external carbon source. Biochem Eng J 2021. [DOI: 10.1016/j.bej.2020.107811] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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8
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Xing T, Yu S, Zhen F, Kong X, Sun Y. Anaerobic fermentation of hybrid Pennisetum mixed with fruit and vegetable wastes to produce volatile fatty acids. RSC Adv 2020; 10:33261-33267. [PMID: 35515045 PMCID: PMC9056692 DOI: 10.1039/d0ra04400h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Accepted: 08/10/2020] [Indexed: 11/21/2022] Open
Abstract
The production of volatile fatty acids (VFAs) via anaerobic fermentation is a new technology that provides a high-value utilization of biomass. This work used hybrid Pennisetum (HP) and fruit and vegetable waste (FVW) as raw materials to investigate the influence of different ratios of HP to FVW on the production of VFAs under different methanogenic inhibition conditions. It has been shown that both alkaline and neutral conditions (using methanogenic inhibitors), could generate higher acid yields than acidic conditions. Under initial alkaline conditions, mono-fermentation of HP and FVW could obtain maximum VFA yields of 596 ± 22 mg g-1 VS and 626 ± 7 mg g-1 VS, which were higher than those obtained under neutral conditions. In contrast, there was no remarkable difference in VFA yield between alkaline and neutral conditions when co-fermentation of HP and FVW was carried out. The VFA yields decreased significantly with the process of co-fermentation. The maximum VFA yields were decreased by 33.2% and 21.9% when HP was fermented with 15% and 30% of FVW, respectively. There was a clear difference in the composition of VFAs obtained under different initial conditions. The maximum selectivity was achieved under alkaline conditions, where the acetate content reached more than 85%. This study brings a theoretical basis for optimizing the anaerobic fermentation process of lignocellulose to produce VFAs.
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Affiliation(s)
- Tao Xing
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences Guangzhou 510640 PR China
- CAS Key Laboratory of Renewable Energy Guangzhou 510640 PR China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640 PR China
- University of Chinese Academy of Sciences Beijing 100049 PR China
| | - Shutai Yu
- Western China Energy & Environment Research Center, Lanzhou University of Technology Lanzhou 730050 PR China
| | - Feng Zhen
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences Guangzhou 510640 PR China
- CAS Key Laboratory of Renewable Energy Guangzhou 510640 PR China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640 PR China
| | - Xiaoying Kong
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences Guangzhou 510640 PR China
- CAS Key Laboratory of Renewable Energy Guangzhou 510640 PR China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640 PR China
| | - Yongming Sun
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences Guangzhou 510640 PR China
- CAS Key Laboratory of Renewable Energy Guangzhou 510640 PR China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640 PR China
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Fang W, Zhang X, Zhang P, Wan J, Guo H, Ghasimi DSM, Morera XC, Zhang T. Overview of key operation factors and strategies for improving fermentative volatile fatty acid production and product regulation from sewage sludge. J Environ Sci (China) 2020; 87:93-111. [PMID: 31791521 DOI: 10.1016/j.jes.2019.05.027] [Citation(s) in RCA: 81] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 05/28/2019] [Accepted: 05/28/2019] [Indexed: 06/10/2023]
Abstract
In recent years, volatile fatty acid (VFA) production through anaerobic fermentation of sewage sludge, instead of methane production, has been regarded as a high-value and promising roadmap for sludge stabilization and resource recovery. This review first presents the effects of some essential factors that influence VFA production and composition. In the second part, we present an extensive analysis of conventional pretreatment and co-fermentation strategies ultimately addressed to improving VFA production and composition. Also, the effectiveness of these approaches is summarized in terms of sludge degradation, hydrolysis rate, and VFA production and composition. According to published studies, it is concluded that some pretreatments such as alkaline and thermal pretreatment are the most effective ways to enhance VFA production from sewage sludge. The possible reasons for the improvement of VFA production by different methods are also discussed. Finally, this review also highlights several current technical challenges and opportunities in VFA production with spectrum control, and further related research is proposed.
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Affiliation(s)
- Wei Fang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. E-mail:
| | - Xuedong Zhang
- Department of Water Management, Section Sanitary Engineering, Delft University of Technology, PO Box 5048, 2600 GA Delft, the Netherlands
| | - Panyue Zhang
- School of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Jijun Wan
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Hongxiao Guo
- Department of Water Management, Section Sanitary Engineering, Delft University of Technology, PO Box 5048, 2600 GA Delft, the Netherlands
| | - Dara S M Ghasimi
- Department of Civil Engineering, University of Kurdistan Hewlêr, Erbil, Kurdistan Region, Iraq
| | - Xavier Carol Morera
- Institut Quimíc de Sarrià, Universitat Ramon Llull, Via Augusta 390, E-08017 Barcelona, Spain
| | - Tao Zhang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. E-mail: .
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10
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Meng S, Yin Y, Yu L. Exploration of a high-efficiency and low-cost technique for maximizing the glucoamylase production from food waste. RSC Adv 2019; 9:22980-22986. [PMID: 35514468 PMCID: PMC9067104 DOI: 10.1039/c9ra04530a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 07/11/2019] [Indexed: 11/26/2022] Open
Abstract
This study was aimed at the exploration of high-efficiency and low-cost technique for glucoamylase (GA) production from food waste; moreover, the produced GA could be directly used in the hydrolysis of food waste. A mixture of food waste, rice waste and cake waste as a sole feedstock was investigated for the production of GA via solid-state fermentation. The highest GA activity of 458.3 U g-1 was obtained from the rice waste after 9 days of incubation. The cake waste also demonstrated a high GA production, achieving 406.5 U g-1 dry substrate. However, the most practical substrate for GA production that could be integrated in the food waste treatment was the mixed food waste, which could effectively produce GA without any additives or adjustments using the technique developed in this study. The optimum conditions for GA production from the mixed food waste were determined through a response surface methodology: the temperature of 31.16 °C, the inoculum amount of 1.54 mL, and the time of fermentation of 7.81 days. The maximum GA activity of 180.59 U g-1 could be achieved under these optimum conditions, which was actually much higher than those reported in the literature. This study showed that the mixed food waste could be an ideal feedstock for the on-site production of high-activity GA, and the produced GA could be directly applied in food waste hydrolysis, which significantly reduced the process cost.
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Affiliation(s)
- Shujuan Meng
- School of Space and Environment, Beihang University Beijing 100191 PR China
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University 1 Cleantech Loop Singapore 637141
| | - Yao Yin
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University 1 Cleantech Loop Singapore 637141
| | - Liu Yu
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University 1 Cleantech Loop Singapore 637141
- School of Civil and Environmental Engineering, Nanyang Technological University 50 Nanyang Avenue Singapore 639798 +65-67905254
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11
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Xiong Z, Hussain A, Lee J, Lee HS. Food waste fermentation in a leach bed reactor: Reactor performance, and microbial ecology and dynamics. BIORESOURCE TECHNOLOGY 2019; 274:153-161. [PMID: 30502606 DOI: 10.1016/j.biortech.2018.11.066] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Revised: 11/15/2018] [Accepted: 11/18/2018] [Indexed: 06/09/2023]
Abstract
Food waste fermentation was investigated in a leach bed reactor operated at acidic, neutral and alkaline conditions. Highest solids reduction of 87% was obtained at pH 7 in 14 days of reaction time with minimum mixing. The concentration of volatile fatty acids increased to 28.6 g COD/L under pH 7, while the highest butyric acid of 16 g COD/L was obtained at pH 6. Bacterial community structure was narrowed down to Bifidobacterium and Clostridium at pH 6, while Bacteroides and Dysgonomonas were identified as main players at both pH 7 and 8. Bacterial populations in the food residue generally reflected those in the leachate, but some bacteria were selectively enriched in the leachate or the food residue. Bacterial community dynamics suggested that biodegradable food waste was first fermented by one of dominant players (e.g., Clostridium) and the other degraded resistant dietary fibers later (e.g., Bifidobacterium, Bacteroides, Dysgonomonas).
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Affiliation(s)
- Ziyi Xiong
- Department of Civil and Environmental Engineering, University of Waterloo, 200 University Avenue West, Ontario N2L3G1, Canada
| | - Abid Hussain
- Department of Civil and Environmental Engineering, University of Waterloo, 200 University Avenue West, Ontario N2L3G1, Canada; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Jangho Lee
- Department of Civil and Environmental Engineering, University of Waterloo, 200 University Avenue West, Ontario N2L3G1, Canada
| | - Hyung-Sool Lee
- Department of Civil and Environmental Engineering, University of Waterloo, 200 University Avenue West, Ontario N2L3G1, Canada.
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12
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Soomro AF, Ni Z, Ying L, Liu J. The effect of ISR on OFMSW during acidogenic fermentation for the production of AD precursor: kinetics and synergies. RSC Adv 2019; 9:18147-18156. [PMID: 35515208 PMCID: PMC9064650 DOI: 10.1039/c9ra02898f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 05/16/2019] [Indexed: 11/21/2022] Open
Abstract
Acidogenic fermentation of organic fraction of municipal solid waste (OFMSW) and it's components (food waste and paper wastes) was studied in batch percolator reactor without artificial pH adjustment.
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Affiliation(s)
| | - Zhe Ni
- Beijing GeoEnviron Engineering & Technology, Inc
- Beijing 100095
- China
| | - Li Ying
- Key Laboratory of Clean Energy of Liaoning
- College of Energy and Environment
- Shenyang Aerospace University
- Shenyang 110136
- China
| | - Jianguo Liu
- School of Environment
- Tsinghua University
- Beijing
- China
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13
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Liu N, Jiang J, Yan F, Gao Y, Meng Y, Aihemaiti A, Ju T. Enhancement of volatile fatty acid production and biogas yield from food waste following sonication pretreatment. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 217:797-804. [PMID: 29660705 DOI: 10.1016/j.jenvman.2018.03.135] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 03/27/2018] [Accepted: 03/31/2018] [Indexed: 06/08/2023]
Abstract
The positive effect of sonication on volatile fatty acid (VFA) and hydrogen production was investigated by batch experiments. Several sonication densities (2, 1.6, and 1.2 W/mL) and times (5, 10, and 15 min) were tested. The optimal sonication condition was ultrasonic density 2 W/mL and ultrasonic time 15 min (2-U15). The FW particle size larger than 50 μm (d > 50 μm) were more susceptible to the sonication treatment than the smaller particle size (d ≤ 50 μm). The SCOD increased and VS reduction accelerated under sonication treatment. The maximum VFA production and the highest proportion of hydrogen in the biogas increased 65.3% and 59.1%, respectively, under the optimal sonication conditions compared to the unsonicated batch. Moreover, a reduction of over 50% in the time required to reach its maximum production was also observed. Butyric acid fermentation type was obtained whether following sonication treatment or not. The composition of key microbial community differed under the various sonication conditions. The genera Clostridium and Parabacteroides are predominantly responsible for VFA generation and both were found to be abundant under the optimal condition.
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Affiliation(s)
- Nuo Liu
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Jianguo Jiang
- School of Environment, Tsinghua University, Beijing 100084, China; Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Beijing 100084, China.
| | - Feng Yan
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Yuchen Gao
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Yuan Meng
- School of Environment, Tsinghua University, Beijing 100084, China
| | | | - Tongyao Ju
- School of Environment, Tsinghua University, Beijing 100084, China
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15
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Liu N, Jiang J, Yan F, Xu Y, Yang M, Gao Y, Aihemaiti A, Zou Q. Optimization of simultaneous production of volatile fatty acids and bio-hydrogen from food waste using response surface methodology. RSC Adv 2018; 8:10457-10464. [PMID: 35540465 PMCID: PMC9078927 DOI: 10.1039/c7ra13268a] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 02/08/2018] [Indexed: 11/21/2022] Open
Abstract
Anaerobic digestion of food waste (FW) is commonly considered an effective and green technology to convert solid waste into valuable feedstock including volatile fatty acids (VFAs) and hydrogen. Response surface methodology (RSM) was selected to analyze the production of VFAs and hydrogen from food waste in a batch process. The effect of the three variables i.e. total solid content (TS), pH, and reaction time under each variable at three levels on VFAs and hydrogen production was assessed. The optimum conditions determined via RSM were pH = 7.0, TS = 100 g L−1, and reaction time = 3 d. The maximum VFA and hydrogen production was 26.17 g L−1 and 46.03 mL g−1 volatile solids added, respectively. The ratio of observed hydrogen (Ho) to predicted hydrogen (Hp) was x < 1.0 because of inhibition of hydrogen production by VFA accumulation. The subsequent microbial community analysis result was also consistent with the abovementioned results. The evolution of Bacteroidetes, which facilitate VFA production, has been enriched by about 16.1-times at pH 7.0 followed by 10.2-times at pH 6.0 as compared to that in the uncontrolled pH batch. Response surface methodology was applied to optimal VFA production from food waste, which could evaluate the interactive effect of each parameter as compared to the traditional approach about just one variable a time on VFA production.![]()
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Affiliation(s)
- Nuo Liu
- School of Environment
- Tsinghua University
- Beijing 100084
- China
| | - Jianguo Jiang
- School of Environment
- Tsinghua University
- Beijing 100084
- China
- Key Laboratory for Solid Waste Management and Environment Safety
| | - Feng Yan
- School of Environment
- Tsinghua University
- Beijing 100084
- China
| | - Yiwen Xu
- School of Environment
- Tsinghua University
- Beijing 100084
- China
| | - Meng Yang
- School of Environment
- Tsinghua University
- Beijing 100084
- China
| | - Yuchen Gao
- School of Environment
- Tsinghua University
- Beijing 100084
- China
| | | | - Quan Zou
- School of Environment
- Tsinghua University
- Beijing 100084
- China
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Zhao J, Gui L, Wang Q, Liu Y, Wang D, Ni BJ, Li X, Xu R, Zeng G, Yang Q. Aged refuse enhances anaerobic digestion of waste activated sludge. WATER RESEARCH 2017; 123:724-733. [PMID: 28719817 DOI: 10.1016/j.watres.2017.07.026] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Revised: 06/26/2017] [Accepted: 07/13/2017] [Indexed: 05/16/2023]
Abstract
In this work, a low-cost alternative approach (i.e., adding aged refuse (AR) into waste activated sludge) to significantly enhance anaerobic digestion of sludge was reported. Experimental results showed that with the addition dosage of AR increasing from 0 to 400 mg/g dry sludge soluble chemical oxygen demand (COD) increased from 1150 to 5240 mg/L at the digestion time of 5 d, while the maximal production of volatile fatty acids (VFA) increased from 82.6 to 183.9 mg COD/g volatile suspended solids. Although further increase of AR addition decreased the concentrations of both soluble COD and VFA, their contents in these systems with AR addition at any concentration investigated were still higher than those in the blank, which resulted in higher methane yields in these systems. Mechanism studies revealed that pertinent addition of AR promoted solubilization, hydrolysis, and acidogenesis processes and did not affect methanogenesis significantly. It was found that varieties of enzymes and anaerobes in AR were primary reason for the enhancement of anaerobic digestion. Humic substances in AR benefited hydrolysis and acidogenesis but inhibited methanogenesis. The effect of heavy metals in AR on sludge anaerobic digestion was dosage dependent. Sludge anaerobic digestion was enhanced by appropriate amounts of heavy metals but inhibited by excessive amounts of heavy metals. The relative abundances of microorganisms responsible for sludge hydrolysis and acidogenesis were also observed to be improved in the system with AR addition, which was consistent with the performance of anaerobic digestion.
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Affiliation(s)
- Jianwei Zhao
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Lin Gui
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Qilin Wang
- Advanced Water Management Centre (AWMC), The University of Queensland, QLD 4072, Australia
| | - Yiwen Liu
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Bing-Jie Ni
- Advanced Water Management Centre (AWMC), The University of Queensland, QLD 4072, Australia
| | - Xiaoming Li
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Rui Xu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Qi Yang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
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Zhao J, Liu Y, Wang D, Chen F, Li X, Zeng G, Yang Q. Potential impact of salinity on methane production from food waste anaerobic digestion. WASTE MANAGEMENT (NEW YORK, N.Y.) 2017; 67:308-314. [PMID: 28526189 DOI: 10.1016/j.wasman.2017.05.016] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 04/21/2017] [Accepted: 05/10/2017] [Indexed: 05/08/2023]
Abstract
Previous studies have demonstrated that the presence of sodium chloride (NaCl) inhibited the production of methane from food waste anaerobic digestion. However, the details of how NaCl affects methane production from food waste remain unknown by now and the efficient approach to mitigate the impact of NaCl on methane production was seldom reported. In this paper, the details of how NaCl affects methane production was first investigated via a series of batch experiments. Experimental results showed the effect of NaCl on methane production was dosage dependent. Low level of NaCl improved the hydrolysis and acidification but inhibited the process of methanogenesis whereas high level of NaCl inhibit both steps of acidification and methanogenesis. Then an efficient approach, i.e. co-digestion of food waste and waste activated sludge, to mitigate the impact of NaCl on methane production was reported. Finally, the mechanisms of how co-digestion mitigates the effect on methane production caused by NaCl in co-digestion system were revealed. These findings obtained in this work might be of great importance for the operation of methane recovery from food waste in the presence of NaCl.
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Affiliation(s)
- Jianwei Zhao
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Yiwen Liu
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Fei Chen
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Xiaoming Li
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Qi Yang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
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18
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Wu Q, Guo W, Yang S, Luo H, Peng S, Ren N. Enhancement of volatile fatty acid production using semi-continuous anaerobic food waste fermentation without pH control. RSC Adv 2015. [DOI: 10.1039/c5ra21162j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study proposed a cost-effective and high-yield volatile fatty acid (VFA) production strategy using anaerobic food waste (FW) fermentation without pH control, which could be recommended for practical scale VFA production and FW treatment.
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Affiliation(s)
- Qinglian Wu
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology
- Harbin
- P. R. China
| | - Wanqian Guo
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology
- Harbin
- P. R. China
| | - Shanshan Yang
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology
- Harbin
- P. R. China
| | - Haichao Luo
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology
- Harbin
- P. R. China
| | - Simai Peng
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology
- Harbin
- P. R. China
| | - Nanqi Ren
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology
- Harbin
- P. R. China
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19
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Liao JQ, Zheng N, Xiao SG. Optimization of ultrasonic frequency for the improvement of extraction yields of bufadienolides from the Chinese medicine ChanSu by using a novel ultrasonic system. RSC Adv 2015. [DOI: 10.1039/c5ra07555f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Optimization of ultrasonic frequency for the improvement of extraction yields of bufadienolides was evaluated successfully using an online extraction system.
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Affiliation(s)
- Jian-Qing Liao
- Department of Physics and Electrical Engineering
- Ningde Normal University
- Ningde 352100
- PR China
| | - Nan Zheng
- School of Chemical and Environment Science
- Shanxi University of Technology
- Hanzhong 723001
- PR China
| | - Shun-Gen Xiao
- Department of Physics and Electrical Engineering
- Ningde Normal University
- Ningde 352100
- PR China
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