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Ossiansson E, Persson F, Bengtsson S, Cimbritz M, Gustavsson DJI. Seasonal variations in acidogenic fermentation of filter primary sludge. WATER RESEARCH 2023; 242:120181. [PMID: 37343334 DOI: 10.1016/j.watres.2023.120181] [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: 04/05/2023] [Revised: 06/01/2023] [Accepted: 06/06/2023] [Indexed: 06/23/2023]
Abstract
Primary treatment of municipal wastewater by rotating belt filtration followed by hydrolysis and acidogenic fermentation of the filter primary sludge (FPS) at ambient temperature was studied at pilot-scale during one year. The seasonal variations of volatile fatty acids (VFAs), nutrient release and soluble COD production as well as microbial community assembly were assessed, leading to novel findings for fermentation at ambient temperature. The reproducibility of VFA production performance was first established by operating the two fermentation reactors under the same conditions, showing similar results regarding VFA production and microbial community structure. One year of operation at 5 d retention time (RT) and 16-29 °C resulted in an average VFA yield of 180±35 mg COD/g VSin and soluble COD yield of 242±40 mg COD/g VSin. The VFA formation was temperature-dependent, with ϴ=1.033±0.005 ( [Formula: see text] . The seasonal variations of the acetic and propionic acid productions were pronounced, whereas the productions of VFAs with longer chains were more stable regardless of temperature. The community structure of the reactor microbiomes was also clearly affected by season and temperature and linked with the production spectrum of VFAs. The ammonium and phosphate releases were stable during the year, leading to a decrease in ratios of soluble COD to NH4+-N and PO43--P during winter. The soluble COD yield was 11% and 27% higher at 5 d RT compared to 3 and 2 d RT respectively, but the corresponding volumetric productivities were lower. The dissimilarities between microbiomes in influent FPS and fermenters were significant even at a short RT of 2 d, and increased with longer RT of 3 and 5 d, primarily caused by selection of bacteria within Bacteroidota in the fermentation reactors.
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Affiliation(s)
- Elin Ossiansson
- VA SYD, Box 191, SE-20121 Malmö, Sweden; Chalmers University of Technology, Dep. of Architecture and Civil Engineering, SE-412, 96 Gothenburg, Sweden.
| | - Frank Persson
- Chalmers University of Technology, Dep. of Architecture and Civil Engineering, SE-412, 96 Gothenburg, Sweden
| | - Simon Bengtsson
- VA SYD, Box 191, SE-20121 Malmö, Sweden; Sweden Water Research, Scheelevägen 15, SE-22370 Lund, Sweden
| | - Michael Cimbritz
- Lund University, Dep. of Chemical Engineering, Box 124, SE-221 00 Lund, Sweden
| | - David J I Gustavsson
- VA SYD, Box 191, SE-20121 Malmö, Sweden; Sweden Water Research, Scheelevägen 15, SE-22370 Lund, Sweden
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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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Penghe Z, Yuling L, Chuanchuan D, Pengliang W. Study on Dissolution Characteristics of Excess Sludge by Low-Temperature Thermal Hydrolysis and Acid Production by Fermentation. ACS OMEGA 2020; 5:26101-26109. [PMID: 33073137 PMCID: PMC7558041 DOI: 10.1021/acsomega.0c03606] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 09/18/2020] [Indexed: 05/22/2023]
Abstract
To investigate the dissolution characteristics of low-temperature thermal pretreatment conditions and the process of sludge fermentation to produce acid, the influence of thermal pretreatment temperature on the dissolution of excess sludge organic composition and the mechanism of cell crushing of sludge thermal pretreatment were analyzed by an experimental method, and the performance of acid production was explored by sludge fermentation after pretreatment at different temperatures. The performance of acid production by sludge fermentation after pretreatment at different temperatures was measured. The results proved that the soluble chemical oxygen demand (SCOD) shows the largest increase in dissolution rate (11.92%) at 70 °C and in dissolution quantity (6518.33 mg/L) at 90 °C. However, at 80 °C, the solubility of total organic carbon (TOC) is the highest (3224.47 mg/L), and at 70 °C, the best dissolution conditions for soluble carbohydrate (SC) and soluble protein (SP) reached 340.07 and 80.92 mg/L, respectively. The degree of sludge breaking starts to increase at 70 °C. Correlation analysis shows that dissolved organic matter is mainly derived from the cell wall and intracellular material and SP is mainly derived from intracellular material. Excitation-emission matrix spectra and parallel factor analysis (EEM-PARAFAC) divides the sludge dissolved organic matter (DOM) into five fluorescent components, including C1 (318/366) tyrosine, C2 (418/470) UVA humic acid, C3 (282/334) tryptophan substances, C4 (322/430) UVC humic acids, and C5 (314, 382, 454/526) UVA humic substances. Fermentation acid production experiment shows that the peak concentration is highest at 80 °C, the arrival time is 2 days, and the acid production type is butyric acid fermentation. Thus, it is proved that low-temperature thermal pretreatment promotes the process of acid-producing fermentation and has no effect on the type of fermentation. The optimal condition for hydrolytic dissolution and acid production under low-temperature thermal pretreatment is 80 °C.
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Zhang Q, Zhao X, Li W, Chen H, Zhu X, Zhu H, Zhang P. Responses of short-chain fatty acids production to the addition of various biocarriers to sludge anaerobic fermentation. BIORESOURCE TECHNOLOGY 2020; 304:122989. [PMID: 32078905 DOI: 10.1016/j.biortech.2020.122989] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Revised: 02/06/2020] [Accepted: 02/07/2020] [Indexed: 06/10/2023]
Abstract
This study aimed to evaluate the effects and explore the mechanisms of polyethylene (PE), polyurethane sponge (PUS), and granule activated carbon (GAC) on short-chain fatty acids (SCFAs) production from sludge anaerobic fermentation. Results showed that no matter the biocarrier type, addition of biocarriers increased the diversity of SCFAs. In contrast with GAC, addition of PE and PUS considerably facilitated the accumulation of the total SCFAs. Suspended PE and PUS might have stronger frictions with sludge particles which resulted in a better sludge disintegration. Other factors that contributed to the enhancement of PE and PUS include higher hydrolytic and acidogenic enzymes activities, lower methanogenic enzyme activity, more Firmicutes and less Proteobacteria. Consistent with enzymatic and microbial results, the PE and the PUS tests also showed greater abundance in all metabolic functions predicted with PICRUSt. This study provides a novel strategy for sludge anaerobic fermentation by using traditional wastewater biocarriers.
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Affiliation(s)
- Qianqian Zhang
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Xingyu Zhao
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Wenjing Li
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Huaqing Chen
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Xiuwen Zhu
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Hongtao Zhu
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Panyue Zhang
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
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