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Sun S, Wang X, Cheng S, Lei Y, Sun W, Wang K, Li Z. A review of volatile fatty acids production from organic wastes: Intensification techniques and separation methods. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 360:121062. [PMID: 38735068 DOI: 10.1016/j.jenvman.2024.121062] [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: 11/21/2023] [Revised: 04/11/2024] [Accepted: 04/29/2024] [Indexed: 05/14/2024]
Abstract
High value-added products from organic waste fermentation have garnered increasing concern in modern society. VFAs are short-chain fatty acids, produced as intermediate products during the anaerobic fermentation of organic matter. VFAs can serve as an essential organic carbon source to produce substitutable fuels, microbial fats and oils, and synthetic biodegradable plastics et al. Extracting VFAs from the fermentation broths is a challenging task as the composition of suspensions is rather complex. In this paper, a comprehensive review of methods for VFAs production, extraction and separation are provided. Firstly, the methods to enhance VFAs production and significant operating parameters are briefly reviewed. Secondly, the evaluation and detailed discussion of various VFAs extraction and separation technologies, including membrane separation, complex extraction, and adsorption methods, are presented, highlighting their specific advantages and limitations. Finally, the challenges encountered by different separation technologies and novel approaches to enhance process performance are highlighted, providing theoretical guidance for recycling VFAs from organic wastes efficiently.
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Affiliation(s)
- Shushuang Sun
- University of Science and Technology Beijing, School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, PR China.
| | - Xuemei Wang
- University of Science and Technology Beijing, School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, PR China.
| | - Shikun Cheng
- University of Science and Technology Beijing, School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, PR China
| | - Yuxin Lei
- University of Science and Technology Beijing, School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, PR China
| | - Wenjin Sun
- University of Science and Technology Beijing, School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, PR China
| | - Kexin Wang
- University of Science and Technology Beijing, School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, PR China
| | - Zifu Li
- University of Science and Technology Beijing, School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, PR China; International Science and Technology Cooperation Base for Environmental and Energy Technology of MOST, University of Science and Technology Beijing, Beijing 100083, PR China.
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2
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Zhang Q, Cao W, Liu Z, Liu Y, Zhang H, Meng H, Meng G, Zheng J. Performance and mechanisms of urea exposure for enhancement of biotransformation of sewage sludge into volatile fatty acids. BIORESOURCE TECHNOLOGY 2023; 388:129776. [PMID: 37709152 DOI: 10.1016/j.biortech.2023.129776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Revised: 08/22/2023] [Accepted: 09/11/2023] [Indexed: 09/16/2023]
Abstract
Herein, a cost-effective method for improving the anaerobic fermentation performance of sewage sludge (SS) is proposed. The highest volatile fatty acids (VFAs) reached up to 5550 mg COD/L with the supplementation of 0.2 g urea/g total suspended solids (TSS). Intensive exploration showed that SS decomposition was profoundly triggered by urea and the free ammonia generated due to the hydrolysis of urea, providing adequately bioaccessible substrates for acidogenic reactions and thus contributing to VFAs formation. Microbial composition analysis indicated that functional bacteria (i.e., Tissierella and Clostridium) associated with VFAs generation were enriched. Moreover, the metabolic activities of functional flora (i.e., membrane transport and fatty acid synthesis) were up-regulated due to the stimulation of urea. In general, the increase in bioavailable organic matter and functional microbes, and thus the increased microbial metabolic activities, improved the efficient production of VFAs. This study could provide a cost-effective approach for resource recovery from SS.
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Affiliation(s)
- Qin Zhang
- School of Energy and Environment, Anhui University of Technology, Ma'anshan 243000, China
| | - Wangbei Cao
- College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Zailiang Liu
- School of Energy and Environment, Anhui University of Technology, Ma'anshan 243000, China
| | - Yiyun Liu
- School of Energy and Environment, Anhui University of Technology, Ma'anshan 243000, China
| | - Huijuang Zhang
- School of Energy and Environment, Anhui University of Technology, Ma'anshan 243000, China
| | - Hailing Meng
- School of Energy and Environment, Anhui University of Technology, Ma'anshan 243000, China
| | - Guanhua Meng
- School of Energy and Environment, Anhui University of Technology, Ma'anshan 243000, China
| | - Jun Zheng
- School of Energy and Environment, Anhui University of Technology, Ma'anshan 243000, China.
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Liu F, Cheng W, Xu J, Wang M, Wan T, Ren J, Li D, Xie Q. Promoting short-chain fatty acids production from sewage sludge via acidogenic fermentation: Optimized operation factors and iron-based persulfate activation system. CHEMOSPHERE 2023; 342:140148. [PMID: 37714473 DOI: 10.1016/j.chemosphere.2023.140148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 08/10/2023] [Accepted: 09/10/2023] [Indexed: 09/17/2023]
Abstract
Promoting short-chain fatty acids (SCFAs) production and ensuring the stability of SCFAs-producing process are becoming the two major issues for popularizing the acidogenic fermentation (AF). The key controlling operating and influencing factors during anaerobic fermentation process were thoroughly reviewed to facilitate better process performance prediction and to optimize the process control of SCFAs promotion. The wide utilization of iron salt flocculants during wastewater treatment could result in iron accumulating in sewage sludge which influenced AF performance. Additionally, appropriate ferric chloride (FC) could promote the SCFAs accumulation, while poly ferric sulfate (PFS) inhibited the bioprocess. Iron/persulfate (PS) system was proved to effectively enhance the SCFAs production while mechanism analysis revealed that the strong oxidizing radicals remarkably enhanced the solubilization and hydrolysis. Moreover, the changes of oxidation-reduction potential (ORP) and pH caused by iron/PS system exhibited more negative effects on the methanogens, comparing to the acidogenic bacteria. Furthermore, performance and mechanisms of different iron species-activating PS, organic chelating agents and iron-rich biochar derived from sewage sludge were also elucidated to extend and strengthen understanding of the iron/PS system for enhancing SCFAs production. Considering the large amount of generated Fe-sludge and the multiple benefits of iron activating PS system, carbon neutral wastewater treatment plants (WWTPs) were proposed with Fe-sludge as a promising recycling composite to improve AF performance. It is expected that this review can deepen the knowledge of optimizing AF process and improving the iron/PS system for enhancing SCFAs production and provide useful insights to researchers in this field.
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Affiliation(s)
- Faxin Liu
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, NO.5, South Jinhua Road, Xi'an, Shaanxi, 710048, China
| | - Wen Cheng
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, NO.5, South Jinhua Road, Xi'an, Shaanxi, 710048, China.
| | - Jianping Xu
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, NO.5, South Jinhua Road, Xi'an, Shaanxi, 710048, China
| | - Min Wang
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, NO.5, South Jinhua Road, Xi'an, Shaanxi, 710048, China
| | - Tian Wan
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, NO.5, South Jinhua Road, Xi'an, Shaanxi, 710048, China
| | - Jiehui Ren
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, NO.5, South Jinhua Road, Xi'an, Shaanxi, 710048, China
| | - Dong Li
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, NO.5, South Jinhua Road, Xi'an, Shaanxi, 710048, China
| | - Qiqi Xie
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, NO.5, South Jinhua Road, Xi'an, Shaanxi, 710048, China
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Yin Z, Wang J, Wang M, Liu J, Chen Z, Yang B, Zhu L, Yuan R, Zhou B, Chen H. Application and improvement methods of sludge alkaline fermentation liquid as a carbon source for biological nutrient removal: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 873:162341. [PMID: 36828064 DOI: 10.1016/j.scitotenv.2023.162341] [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: 12/04/2022] [Revised: 02/15/2023] [Accepted: 02/15/2023] [Indexed: 06/18/2023]
Abstract
Alkaline fermentation can reduce the amount of waste activated sludge and prepare sludge alkaline fermentation liquid (SAFL) rich in short-chain fatty acids (SCFAs), which can be used as a high-quality carbon source for the biological nutrient removal (BNR) process. This review compiles the production method of SAFL and the progress of its application as a BNR carbon source. Compared with traditional carbon sources, SAFL has the advantages of higher efficiency and economy, and different operating conditions can influence the yield and structure of SCFAs in SAFL. SAFL can significantly improve the nutrient removal efficiency of the BNR process. Taking SAFL as the internal carbon source of BNR can simultaneously solve the problem of carbon source shortage and sludge treatment difficulties in wastewater treatment plants, and further reduce the operating cost. However, the alkaline fermentation process results in many refractory organics, ammonia and phosphate in SAFL, which reduces the availability of SAFL as a carbon source. Purifying SCFAs by removing nitrogen and phosphorus, directly extracting SCFAs, or increasing the amount of SCFAs in SAFL by co-fermentation or combining with other pretreatment methods, etc., are effective measures to improve the availability of SAFL.
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Affiliation(s)
- Zehui Yin
- School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China
| | - Jihong Wang
- School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China
| | - Mingran Wang
- School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China
| | - Jiandong Liu
- School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China
| | - Zhongbing Chen
- Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, Praha, Suchdol 165 00, Czech Republic
| | - Boyu Yang
- Nanjing Academy of Resources and Ecology Sciences, No. 606, Ningliu Road, Jiangbei New District, 210044 Nanjing, China
| | - Lixin Zhu
- Sinopec Nanjing Chemical Industries Co., Ltd., No. 189, Geguan Road, Liuhe District, Jiangsu 210048, Nanjing, China
| | - Rongfang Yuan
- School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China.
| | - Beihai Zhou
- School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China
| | - Huilun Chen
- School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China.
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5
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Sun J, Wang F, Jia X, Wang X, Xiao X, Dong H. Research progress of bio-slurry remediation technology for organic contaminated soil. RSC Adv 2023; 13:9903-9917. [PMID: 37034448 PMCID: PMC10076817 DOI: 10.1039/d2ra06106f] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 03/13/2023] [Indexed: 04/11/2023] Open
Abstract
Bio-slurry remediation technology, as a controllable bioremediation method, has the significant advantage of high remediation efficiency and can effectively solve the problems of high energy consumption and secondary pollution of traditional organic pollution site remediation technology. To further promote the application of this technology in the remediation of organically polluted soil, this paper summarizes the importance and advantages of bio-slurry remediation technology compared with traditional soil remediation technologies (physical, chemical, and biological). It introduces the technical infrastructure and its technological processes. Then, various factors that may affect its remediation performance are discussed. By analyzing the applications of this technology to the remediation of typical organic pollutant-(polycyclic aromatic hydrocarbons(PAHs), polychlorinated biphenyls(PCBs), total petroleum hydrocarbons(TPH), and pesticide) contaminated sites, the following key features of this remediation technology are summarised: (1) the technology has a wide range of applications and can be used in a versatile way in the remediation projects of various types of organic-contaminated soil sites such as in clay, sand, and high organic matter content soil; (2) the technology is highly controllable. Adjusting environmental parameters and operational conditions, such as nutrients, organic carbon sources (bio-stimulation), inoculants (bio-augmentation), water-to-soil ratio, etc., can control the remediation process, thus improving the restoration performance. To sum up, this bio-slurry remediation technology is an efficient, controllable and green soil remediation technology that has broad application prospects.
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Affiliation(s)
- Jing Sun
- Environmental Science and Engineering, Qilu University of Technology Jinan 250353 China
| | - Fujia Wang
- Environmental Science and Engineering, Qilu University of Technology Jinan 250353 China
- Environmental Testing and Experiment Center, Chinese Research Academy of Environmental Sciences Beijing 100012 China
| | - Xiaohan Jia
- Environmental Testing and Experiment Center, Chinese Research Academy of Environmental Sciences Beijing 100012 China
| | - Xiaowei Wang
- Environmental Testing and Experiment Center, Chinese Research Academy of Environmental Sciences Beijing 100012 China
| | - Xinxin Xiao
- Environmental Testing and Experiment Center, Chinese Research Academy of Environmental Sciences Beijing 100012 China
| | - Huaijin Dong
- Environmental Testing and Experiment Center, Chinese Research Academy of Environmental Sciences Beijing 100012 China
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Yuan F, Sun Y, Jiang X, Liu T, Kang B, Freguia S, Feng L, Chen Y. Dioctyl phthalate enhances volatile fatty acids production from sludge anaerobic fermentation: Insights of electron transport and metabolic functions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 859:160102. [PMID: 36370796 DOI: 10.1016/j.scitotenv.2022.160102] [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: 10/11/2022] [Revised: 11/04/2022] [Accepted: 11/05/2022] [Indexed: 06/16/2023]
Abstract
As one of the most widely used phthalate plasticizers, dioctyl phthalate (DOP) has been detected in wastewater and accumulates in sludge through wastewater treatment, which may adversely affect further sludge treatment. However, the role of DOP on sludge anaerobic fermentation and its mechanism are not yet clear. Therefore, this study focused on the effect of DOP on the volatile fatty acids (VFAs) generation via the anaerobic fermentation of sludge. The results demonstrated that the presence of DOP had a considerable contribution to the generation of VFAs, and the maximum production of VFAs reached 4769 mg COD/L at 500 mg/kg DOP, which was 1.57 folds that of the control. Mechanistic investigation showed that DOP mainly enhanced the hydrolysis, acidification and related enzymes activities of sludge. VFAs-producing microorganisms (e.g., Clostridium and Conexibacter) were also enriched under DOP exposure. Importantly, the presence of DOP increased the electron transfer activity by 26 %, consequently facilitating the organics conversion and fermentation process. Notably, the functional gene expressions involved in substrate metabolism and VFAs biosynthesis were enhanced with DOP, resulting in increased VFAs production from sludge. The results obtained in this study offered a new strategy for the control of pollutants and the recycling of valuable products from sludge.
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Affiliation(s)
- Feiyi Yuan
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China
| | - Yi Sun
- Downhole Technical Service Branch, Bohai Drilling Engineering Co., Ltd, National Petroleum Corporation, 8, Second Street, Economic and Technological Development Zone, Tianjin 300450, PR China
| | - Xiupeng Jiang
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China
| | - Tao Liu
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China
| | - Bo Kang
- School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, Anhui Province 230009, PR China
| | - Stefano Freguia
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Leiyu Feng
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
| | - Yinguang Chen
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
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Yang G, Xu C, Varjani S, Zhou Y, Wc Wong J, Duan G. Metagenomic insights into improving mechanisms of Fe 0 nanoparticles on volatile fatty acids production from potato peel waste anaerobic fermentation. BIORESOURCE TECHNOLOGY 2022; 361:127703. [PMID: 35907599 DOI: 10.1016/j.biortech.2022.127703] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/21/2022] [Accepted: 07/22/2022] [Indexed: 06/15/2023]
Abstract
The management of potato peel waste (PPW) has been a challenge faced by the potato industry. This investigation assessed the feasibility of PPW for volatile fatty acids (VFAs) production via anaerobic fermentation, and investigated the impact of Fe0 nanoparticles (Fe0 NPs) supplementation on the VFAs production. It is found that PPW is a potential feedstock for producing VFAs, achieving a yield of 480.4 mg COD/g-vS Meanwhile, the supplementation of Fe0 NPs significantly promoted the VFAs productivity and quality. The higher enrichment of VFAs-producing bacteria, including Clostridium, Proteiniphilum, Fonticella and Pygmaiobacter, contributed to the promotion of the VFAs yield. Furthermore, metagenomic analysis revealed that the encoding genes responsible for carbohydrate metabolism (especially starch), membrane transport, glycolysis and the formation of acetic and butyric acids were remarkably up-regulated,which could be the essential reason for the enhanced metabolic activity and VFAs productivity. This work provides a promising strategy for recycling PPW.
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Affiliation(s)
- Guang Yang
- State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Chonglin Xu
- College of Resources and Environment, Key Laboratory of Agricultural Environment, Shandong Agricultural University, Tai'an 271018, China
| | - Sunita Varjani
- Gujarat Pollution Control Board, Gandhinagar-382 010, Gujarat, India
| | - Yaoyu Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Jonathan Wc Wong
- Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, China
| | - Guilan Duan
- State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Yin Y, Hu Y, Wang J. Co-fermentation of sewage sludge and lignocellulosic biomass for production of medium-chain fatty acids. BIORESOURCE TECHNOLOGY 2022; 361:127665. [PMID: 35872272 DOI: 10.1016/j.biortech.2022.127665] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 07/17/2022] [Accepted: 07/18/2022] [Indexed: 06/15/2023]
Abstract
Medium-chain fatty acids (MCFAs) production from sewage sludge and lignocellulosic biomass (fallen leaves and grass) was explored. Co-fermentation of sludge and lignocellulosic biomass significantly accelerated the caproate production and promoted the longer-chain MCFAs formation. Co-fermentation of sludge and grass achieved the highest caproate production of 89.50 mmol C/L, which was 18.04 % and 41.73 % higher than the mono-fermentation of grass and sludge, respectively. Co-fermentation of sludge and leaves produced 63.80 mmol C/L caproate, which was 11.09 % and 1.03 % higher than the mono-fermentation of leaves and sludge, respectively. Microbial analysis showed that co-fermentation enriched CE microbes like genus Clostridium_sensu_stricto_13, Caprocipiproducens, Terrisporpbacter and Praraclostridium, and suppressed the competitive microbes like genus norank_f_Caldilineaceae and Desulfomicrobium. Functional enzymes analysis revealed that co-fermentation of sludge and leaves promoted MCFAs production through strengthening reverse β oxidation (RBO) pathway, while co-fermentation of sludge and grass stimulated MCFAs production by strengthening fatty acid biosynthesis (FAB) pathway.
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Affiliation(s)
- Yanan Yin
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China
| | - Yuming Hu
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China
| | - Jianlong Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China; Beijing Key Laboratory of Radioactive Waste Treatment, INET, Tsinghua University, Beijing 100084, PR China.
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Zhang Q, Cheng X, Wang F, Fang S, Zhang L, Huang W, Fang F, Cao J, Luo J. Unveiling the behaviors and mechanisms of percarbonate on the sludge anaerobic fermentation for volatile fatty acids production. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 838:156054. [PMID: 35595140 DOI: 10.1016/j.scitotenv.2022.156054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 04/30/2022] [Accepted: 05/15/2022] [Indexed: 06/15/2023]
Abstract
Percarbonate (PC), as a cheap and environmental-friendly chemical oxidant, has been applied extensively in various fields. However, the impacts of PC on the waste activated sludge (WAS) anaerobic fermentation process are unknown. This study mainly aimed to investigate its effects on the production of volatile fatty acids (VFAs) and disclose the underlying mechanisms. Results indicated that the maximal VFAs yield at 0.3 g PC/g TSS within 4 d was 1452.9 mg COD/L while it was only 296.4 mg COD/L in the control at the fermentation time of 6 d. The mechanistic analysis demonstrated that PC treatment substantially promoted the extracellular polymeric substances (EPS) disruption and cell lysis, and meanwhile improved the biodegradability of released organics, thereby providing more bio-availability substrates for further acidogenic metabolic processes. Moreover, the abundance of fermentative microorganisms (i.e., Proteiniclasticum) and the microbial activities correlated with substrates metabolism and VFAs biosynthesis (i.e. hydrolases and metabolic genetic expression levels) were also evidently improved by the PC. This work provides a feasible method for improving the resource recovery from WAS and discloses the responses of the microbial community to chemicals stimulus for the regulations of the biochemical fermentation process in anaerobic systems.
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Affiliation(s)
- Qin Zhang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China; School of Energy and Environment, Anhui University of Technology, Ma'anshan 243000, China
| | - Xiaoshi Cheng
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Feng Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Shiyu Fang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Le Zhang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Wenxuan Huang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Fang Fang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Jiashun Cao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Jingyang Luo
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China; Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, China.
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10
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Yin Y, Wang J. Medium-chain carboxylates production by co-fermentation of sewage sludge and macroalgae. BIORESOURCE TECHNOLOGY 2022; 347:126718. [PMID: 35032558 DOI: 10.1016/j.biortech.2022.126718] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/08/2022] [Accepted: 01/10/2022] [Indexed: 06/14/2023]
Abstract
The co-fermentation of sewage sludge and macroalgae at different mixing ratios was performed for medium-chain carboxylates (MCCs) production. The results showed that MCCs production was enhanced in co-fermentation groups due to the abundant readily available organics supplied by macroalgae and the alkaline buffer capacity provided by sewage sludge. Highest MCCs concentration of 112.7 mmol C/L (25.5 mmol C/g VSadded) was obtained in the co-fermentation group with sludge/macroalgae ratio of 4:6, which was higher than MCCs produced from the mono-fermentation of sewage sludge (41.7 mmol C/L, 9.4 mmol C/g VSadded) or macroalgae (79.9 mmol C/L, 18.1 mmol C/g VSadded). Microbial analysis showed that species from genus Romboutsia, Terrisporobacter, Clostridium_sensu_stricto_12, Paraclostridium, unclassified_f_Peptostreptococcaceae and Caproiciproducens were significantly positively correlated with MCCs production. Metabolic pathways analysis demonstrated that the co-fermentation promoted the chain elongation process by stimulating the rate-limiting steps involved in the conversion of ethanol to Acetyl-CoA and circular fatty acid biosynthesis pathway.
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Affiliation(s)
- Yanan Yin
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China
| | - Jianlong Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China; Beijing Key Laboratory of Radioactive Waste Treatment, INET, Tsinghua University, Beijing 100084, PR China.
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