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Nordell E, Björn A, Waern S, Shakeri Yekta S, Sundgren I, Moestedt J. Thermal post-treatment of digestate in order to increase biogas production with simultaneous pasteurization. J Biotechnol 2021; 344:32-39. [PMID: 34929206 DOI: 10.1016/j.jbiotec.2021.12.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 12/03/2021] [Accepted: 12/13/2021] [Indexed: 01/17/2023]
Abstract
Biogas production by anaerobic digestion (AD) of organic wastes is important for the transition to fossil free fuels in both the transport sector, industries and shipping. The aim of this study was to target the residual organic matter in the outgoing residue from the AD process, so called digestate, with different thermal treatment methods in order to improve digestate degradability and biogas potential upon post-digestion. The thermal treatment was performed at 55 °C in 24 h, 70 °C in 1 h and by thermal hydrolysis process (THP; 165 °C, 8 bar in 0.33 h), and were carefully selected to offer a simultaneous possibility for pasteurization of the digestate according to the regulations in Sweden. Digestates from ten full-scale biogas plants were collected, with different substrate profiles including wastewater treatment plant (WWTP), food waste digestion, agriculture digestion and manure digestion. The results showed that all thermal treatment methods caused increased dissolved organic carbon concentration (DOC). Four of the thermal treated digestates with the highest increase in DOC were subsequently tested for the bio-methane potential. Thermal treatments at 70 °C and THP, respectively, resulted in the highest increase in bio-methane potentials, with an increase of 15-39% for one WWTP, 38 - 40% for digestate from an agriculture digestion plant and 20 - 22% for digestate from a co-digestion plant treating food waste. Interestingly, the bio-methane potential from digestate treated with the energy-intense THP method, did not show any significant difference compared to thermal treatment at 70 °C for 1 h. The outcomes of this study suggest that placing a pasteurization unit between a main digester and a post digester, when applying two-step digestion allows for a combined pasteurization and increased biogas production.
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Affiliation(s)
- E Nordell
- Tekniska verken i Linköping AB, Department of Biogas R &D, Box 1500, Linköping SE-581 15, Sweden; Biogas Research Center, Linköping University, Linköping SE-581 83, Sweden
| | - A Björn
- Biogas Research Center, Linköping University, Linköping SE-581 83, Sweden; Department of Thematic Studies-Environmental Change, Linköping University, Linköping SE-581 83, Sweden
| | - S Waern
- Tekniska verken i Linköping AB, Department of Biogas R &D, Box 1500, Linköping SE-581 15, Sweden; Biogas Research Center, Linköping University, Linköping SE-581 83, Sweden
| | - S Shakeri Yekta
- Biogas Research Center, Linköping University, Linköping SE-581 83, Sweden; Department of Thematic Studies-Environmental Change, Linköping University, Linköping SE-581 83, Sweden
| | - I Sundgren
- Biogas Research Center, Linköping University, Linköping SE-581 83, Sweden; Department of Thematic Studies-Environmental Change, Linköping University, Linköping SE-581 83, Sweden
| | - J Moestedt
- Tekniska verken i Linköping AB, Department of Biogas R &D, Box 1500, Linköping SE-581 15, Sweden; Biogas Research Center, Linköping University, Linköping SE-581 83, Sweden; Department of Thematic Studies-Environmental Change, Linköping University, Linköping SE-581 83, Sweden.
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Paritosh K, Mathur S, Pareek N, Vivekanand V. Enhancing hydrolysis and syntropy simultaneously in solid state anaerobic digestion: Digester performance and techno-economic evaluation. BIORESOURCE TECHNOLOGY 2021; 338:125538. [PMID: 34274581 DOI: 10.1016/j.biortech.2021.125538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Revised: 07/06/2021] [Accepted: 07/07/2021] [Indexed: 06/13/2023]
Abstract
The present study investigated the effect of alkali and biochar addition for simultaneous increment of hydrolysis and syntropy for higher methane yield from pearl millet straw (PMS) in solid state anaerobic digestion. A taguchi based design of experiment was coupled with grey relation analysis for multiple output optimization. Study showed that 0.5 g (g/100 g PMS) of alkali and 10 g/L of biochar was the optimised dosing. Statistically, contribution of biochar and alkali was 48 and 21% respectively on the multiple output. The confirmation test revealed that hydrolysis rate constant, k and total volatile fatty acid/alkalinity ratio for reactor having optimised conditions was 0.0521 d-1 and 0.36 while for control, it was 0.0595 d-1 and 0.76 respectively. Techno-economic assessment showed US$ 25,652 of net present value and 11.29% of internal rate of return. Sensitivity analysis showed that capital expenditure and methane yield was most sensitive to net present value.
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Affiliation(s)
- Kunwar Paritosh
- Centre for Energy and Environment, Malaviya National Institute of Technology Jaipur, JLN Marg, Jaipur, Rajasthan 302017, India
| | - Sanjay Mathur
- Department of Civil Engineering, Malaviya National Institute of Technology Jaipur, JLN Marg, Jaipur, Rajasthan 302017, India
| | - Nidhi Pareek
- Department of Microbiology, School of Life Sciences, Central University of Rajasthan, Bandarsindri, Kishangarh, Ajmer, Rajasthan 305801, India
| | - Vivekanand Vivekanand
- Centre for Energy and Environment, Malaviya National Institute of Technology Jaipur, JLN Marg, Jaipur, Rajasthan 302017, India.
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Nguyen TH, Nguyen MK, Le THO, Bui TT, Nguyen TH, Nguyen TQ, van Ngo A. Kinetics of Organic Biodegradation and Biogas Production in the Pilot-Scale Moving Bed Biofilm Reactor (MBBR) for Piggery Wastewater Treatment. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2021; 2021:6641796. [PMID: 33489419 PMCID: PMC7803399 DOI: 10.1155/2021/6641796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/04/2020] [Accepted: 12/18/2020] [Indexed: 06/12/2023]
Abstract
In this research, the kinetics of COD biodegradation and biogas production in a moving bed biofilm reactor (MBBR) at pilot scale (10 m3) for piggery wastewater treatment were investigated. Polyethylene (PE) was used as a carrying material, with organic loading rates (OLRs) of 10, 15, and 18 kgCOD/m3 day in accordance to hydraulic retention times (HRTs) of 0.56, 0.37, and 0.3 day. The results showed that a high COD removal efficiency was obtained in the range of 68-78% with the influent COD of 5.2-5.8 g/L at all 3 HRTs. About COD degradation kinetics, in comparison to the first- and second-order kinetics and the Monod model, Stover-Kincannon model showed the best fit with R 2 0.98 and a saturation value constant (K B ) and a maximum utilization rate (U max) of 52.40 g/L day and 82.65 g/L day, respectively. The first- and second-order kinetics with all 3 HRTs and Monod model with the HRT of 0.56 day also obtained high R 2 values. Therefore, these kinetics and models can be further considered to be used for predicting the kinetic characteristics of the MBBR system in piggery wastewater treatment process. The result of a 6-month operation of the MBBR was that biogas production was mostly in the operating period of days 17 to 80, around 0.2 to 0.3 and 0.15-0.20 L/gCODconverted, respectively, and then reduction at an OLR of 18 kgCOD/m3. After the start-up stage, day 35 biogas cumulative volume fluctuated from 20 to 30 m3/day and reached approximately 3500 m3 for 178 days during the whole digestive process. Methane is accounted for about 65-70% of biogas with concentration around 400 mg/L.
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Affiliation(s)
- Thi Ha Nguyen
- Faculty of Environmental Sciences, VNU University of Science, Vietnam National University, Hanoi, Vietnam
| | - Manh Khai Nguyen
- Faculty of Environmental Sciences, VNU University of Science, Vietnam National University, Hanoi, Vietnam
| | - Thi Hoang Oanh Le
- Faculty of Environmental Sciences, VNU University of Science, Vietnam National University, Hanoi, Vietnam
| | - Thanh Tu Bui
- Faculty of Mathematics, Mechanics and Informatics, VNU University of Science, Vietnam National University, Hanoi, Vietnam
| | - Trong Hieu Nguyen
- Faculty of Mathematics, Mechanics and Informatics, VNU University of Science, Vietnam National University, Hanoi, Vietnam
| | - Truong Quan Nguyen
- Research Centre for Environmental Technology & Sustainable Development, VNU University of Science, Vietnam National University, Hanoi, Vietnam
| | - Anh van Ngo
- Faculty of Environmental Sciences, VNU University of Science, Vietnam National University, Hanoi, Vietnam
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Nordell E, Moestedt J, Österman J, Shakeri Yekta S, Björn A, Sun L, Schnürer A. Post-treatment of dewatered digested sewage sludge by thermophilic high-solid digestion for pasteurization with positive energy output. WASTE MANAGEMENT (NEW YORK, N.Y.) 2021; 119:11-21. [PMID: 33032154 DOI: 10.1016/j.wasman.2020.09.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 08/12/2020] [Accepted: 09/17/2020] [Indexed: 06/11/2023]
Abstract
This study investigated the possibility to use thermophilic anaerobic high solid digestion of dewatered digested sewage sludge (DDS) at a wastewater treatment plant (WWTP) as a measure to increase total methane yield, achieve pasteurization and reduce risk for methane emissions during storage of the digestate. A pilot-scale plug-flow reactor was used to mimic thermophilic post-treatment of DDS from a WWTP in Linköping, Sweden. Process operation was evaluated with respect to biogas process performance, using both chemical and microbiological parameters. Initially, the process showed disturbance, with low methane yields and high volatile fatty acid (VFA) accumulation. However, after initiation of digestate recirculation performance improved and the specific methane production reached 46 mL CH4/g VS. Plug flow conditions were assessed with lithium chloride and the hydraulic retention time (HRT) was determined to be 19-29 days, sufficient to reach successful pasteurization. Degradation rate of raw protein was high and resulted in ammonia-nitrogen levels of up to 2.0 g/L and a 30% lower protein content in the digestate as compared to DDS. Microbial analysis suggested a shift in the methane producing pathway, with dominance of syntrophic acetate oxidation and the candidate methanogen family WSA2 by the end of the experiment. Energy balance calculations based on annual DDS production of 10000 ton/year showed that introduction of high-solid digestion as a post-treatment and pasteurization method would result in a positive energy output of 340 MWh/year. Post-digestion of DDS also decreased residual methane potential (RMP) by>96% compared with fresh DDS.
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Affiliation(s)
- E Nordell
- Tekniska verken i Linköping AB, Department of Biogas R&D, Box 1500, SE-581 15 Linköping, Sweden; Biogas Research Center, Linköping University, SE-581 83 Linköping, Sweden.
| | - J Moestedt
- Tekniska verken i Linköping AB, Department of Biogas R&D, Box 1500, SE-581 15 Linköping, Sweden; Biogas Research Center, Linköping University, SE-581 83 Linköping, Sweden; Department of Thematic Studies Environmental Change, Linköping University, SE-581 83 Linköping, Sweden
| | - J Österman
- Tekniska verken i Linköping AB, Department of Biogas R&D, Box 1500, SE-581 15 Linköping, Sweden
| | - S Shakeri Yekta
- Biogas Research Center, Linköping University, SE-581 83 Linköping, Sweden; Department of Thematic Studies Environmental Change, Linköping University, SE-581 83 Linköping, Sweden
| | - A Björn
- Biogas Research Center, Linköping University, SE-581 83 Linköping, Sweden; Department of Thematic Studies Environmental Change, Linköping University, SE-581 83 Linköping, Sweden
| | - L Sun
- Department of Molecular Sciences, Biocenter, Swedish University of Agricultural Sciences, Uppsala, Box 7015, SE-750 07 Uppsala, Sweden
| | - A Schnürer
- Biogas Research Center, Linköping University, SE-581 83 Linköping, Sweden; Department of Thematic Studies Environmental Change, Linköping University, SE-581 83 Linköping, Sweden; Department of Molecular Sciences, Biocenter, Swedish University of Agricultural Sciences, Uppsala, Box 7015, SE-750 07 Uppsala, Sweden.
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Wright A, Rollinson A, Yadav D, Lisowski S, Iza F, Holdich R, Radu T, Hemaka Bandulasena H. Plasma-assisted pre-treatment of lignocellulosic biomass for anaerobic digestion. FOOD AND BIOPRODUCTS PROCESSING 2020. [DOI: 10.1016/j.fbp.2020.09.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Rollinson AN, Bhuptani J, Beyer J, Ismawati Y, Radu T. Anaerobic digestion of mercury phytoextraction crops with intermediary stage bio-waste polymer treatment. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2020; 22:1431-1439. [PMID: 32602364 DOI: 10.1080/15226514.2020.1781781] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In laboratory experiments, Lepidium sativum L. and Mentha spicata L. were grown in compost spiked with mercury. After cultivation for 20 and 68 days, respectively, translocation factors of 0.05 ≤ TF ≤ 0.2 (Lepidium sativum) and accumulation factors of 2.2 ≤ AF ≤ 12 (Mentha spicata) were recorded. Plants were then harvested and used as feedstock for bench-scale anaerobic digesters. The reactors operated in continuously-stirred batch mode for a period of ten days. Inhibition of anaerobic biogas production was apparent with one sample set evidencing mercury-induced bacteriostatic toxicity. Otherwise, ex-situ characterization of digestate showed that the reactors were within stable operating range. A canola oil-sulphide polymer derived from bio-waste was also used as an intermediary treatment stage to test its capacity for extracting mercury from half the samples prior to anaerobic digestion, and also from the post-experimentation reactor digestate. The polymer removed mercury from digestate with a 40-50% efficacy across all samples, suggesting its potential as a sludge clean-up option. Anaerobic digestion combined with staged polymer extraction offers a potential route for the disposal of phytoremediation crops and ultimately the recovery of mercury, coincident with the production of a bioenergy vector.
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Affiliation(s)
- Andrew N Rollinson
- School of Architecture, Building and Civil Engineering, Loughborough University, Loughborough, UK
| | - Jayshree Bhuptani
- School of Architecture, Building and Civil Engineering, Loughborough University, Loughborough, UK
| | | | | | - Tanja Radu
- School of Architecture, Building and Civil Engineering, Loughborough University, Loughborough, UK
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Moestedt J, Rönnberg J, Nordell E. The effect of different mesophilic temperatures during anaerobic digestion of sludge on the overall performance of a WWTP in Sweden. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 76:3213-3219. [PMID: 29236000 DOI: 10.2166/wst.2017.367] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This project was initiated to evaluate the effect of alternative process temperatures to 38 °C at the anaerobic digestion step in a Swedish wastewater treatment plant (WWTP) treating mixed sludge. The efficiency of the different temperatures was evaluated with respect to biogas production, volume of sludge produced and nutrient content in the reject water to find the optimum temperature for the WWTP as a whole. Three temperatures, 34 °C, 38 °C and 42 °C, were compared in laboratory scale. Increasing the process temperature to 42 °C resulted in process instability, reduced methane yield, accumulation of volatile fatty acids and higher treatment costs of the reject water. By decreasing the temperature to 34 °C, slightly higher sludge mass was observed and a lower gas production rate, while the specific methane produced remained unchanged compared to 38 °C but foaming was observed at several occasions. In summary 38 °C was proved to be the most favourable temperature for the anaerobic digestion process treating mixed sludge when the evaluation included effects such as foaming, sludge mass and quality of the reject water.
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Affiliation(s)
- J Moestedt
- Department of Biogas R&D, Tekniska verken i Linköping AB, Box 1500, Linköping SE-581 15, Sweden E-mail:
| | - J Rönnberg
- Department of Biogas R&D, Tekniska verken i Linköping AB, Box 1500, Linköping SE-581 15, Sweden E-mail: ; Present address: ELVA AB, Box 5048, SE-591 l05 Motala, Sweden
| | - E Nordell
- Department of Biogas R&D, Tekniska verken i Linköping AB, Box 1500, Linköping SE-581 15, Sweden E-mail:
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Protocol for Start-Up and Operation of CSTR Biogas Processes. SPRINGER PROTOCOLS HANDBOOKS 2016. [DOI: 10.1007/8623_2016_214] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Nordell E, Nilsson B, Nilsson Påledal S, Karisalmi K, Moestedt J. Co-digestion of manure and industrial waste--The effects of trace element addition. WASTE MANAGEMENT (NEW YORK, N.Y.) 2016; 47:21-27. [PMID: 25812806 DOI: 10.1016/j.wasman.2015.02.032] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Revised: 02/17/2015] [Accepted: 02/25/2015] [Indexed: 06/04/2023]
Abstract
Manure is one of the most common substrates for biogas production. Manure from dairy- and swine animals are often considered to stabilize the biogas process by contributing nutrients and trace elements needed for the biogas process. In this study two lab-scale reactors were used to evaluate the effects of trace element addition during co-digestion of manure from swine- and dairy animals with industrial waste. The substrate used contained high background concentrations of both cobalt and nickel, which are considered to be the most important trace elements. In the reactor receiving additional trace elements, the volatile fatty acids (VFA) concentration was 89% lower than in the control reactor. The lower VFA concentration contributed to a more digested digestate, and thus lower methane emissions in the subsequent storage. Also, the biogas production rate increased with 24% and the biogas production yield with 10%, both as a result of the additional trace elements at high organic loading rates. All in all, even though 50% of the feedstock consisted of manure, trace element addition resulted in multiple positive effects and a more reliable process with stable and high yield.
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Affiliation(s)
- Erik Nordell
- Tekniska verken i Linköping AB (public), Dept. of Biogas R&D, Box 1500, SE-581 15 Linköping, Sweden.
| | - Britt Nilsson
- Kemira Kemi AB, Koppargatan 20, P.O. Box 902, SE-251 09 Helsingborg, Sweden
| | - Sören Nilsson Påledal
- Tekniska verken i Linköping AB (public), Dept. of Biogas R&D, Box 1500, SE-581 15 Linköping, Sweden
| | - Kaisa Karisalmi
- Kemira Oyj, Espoo R&D Center, Luoteisrinne 2, P.O. Box 44, FI-02270 Espoo, Finland
| | - Jan Moestedt
- Tekniska verken i Linköping AB (public), Dept. of Biogas R&D, Box 1500, SE-581 15 Linköping, Sweden; Department of Microbiology, Uppsala BioCenter, Swedish University of Agricultural Sciences, SE-750 07 Uppsala, Sweden
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