Simulation and validation of a model for heating underground biogas digesters by solar energy

Hassanein, Amro; Qiu, Ling; Pan, Junting; Ge, Yunshan; Witarsa, Freddy; Hassanain, A. A.

doi:10.1016/j.ecoleng.2015.05.010

Cited by 30 publications

(12 citation statements)

References 30 publications

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“…This means that the two constraints to develop anaerobic digesters in this area are the altitude and the temperature. However, while the temperature effect has been reported by many researchers [7][8][9][10][11][12][13][14], the effect of the pressure (altitude) was found not to significantly affect the production of biogas or the methane content in the Andean area [5].…”

Section: Introductionmentioning

confidence: 85%

“…All the information in the next tables has been taken from the National Agriculture and Livestock Census from 2012 [14] ( Tables 8,9,10,11,12,13,14,15,16,17,18,19).…”

Section: Appendix 1: Social Information Of Ayacuchomentioning

confidence: 99%

“…Thermally enhanced digesters can be achieved using heated chambers (at laboratory scale) [11], through water jackets [10], using greenhouses [12], or immersed heat exchangers [13]. For this project, a small-scale digester with a water jacket was modelled using solar collectors to heat the water going in the wrapped-around heat exchanger of the water jacket.…”

Section: Introductionmentioning

confidence: 99%

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Techno-economic analysis of an enhanced anaerobic digester in the Andean area of Peru

Jaeger¹,

Blanchard

2022

Int J Energy Environ Eng

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This paper aims to determine the economic and technical feasibility of developing a thermally enhanced digester in the Andean area using solar collectors. Communities in the rural area of the Andes lack access to electricity and other basic services which impact negatively on their everyday life and exposes them to harmful and inefficient fuels. Several experiences with anaerobic digestion prove that this technology could be applied in the Andean area, although its performance is limited due to low temperatures. To overcome this constraint, an enhanced digester was modelled and simulated using TRNSYS Software. The system consisted of two solar collectors, a storage tank and a digester with a wrapped-around heat exchanger. The average digester temperature in the simulation was 30.7 °C. The enhanced temperature was used in a model to calculate the daily biogas production. The Net Present Value and Internal Rate of Return were calculated and confirm the economic viability of the project. The biogas production fully covers the requirements of the system for household cooking and lighting, making a significant social impact. This simulation indicates that it is technically possible to develop an enhanced digester in the Andean area that is economically viable as well.

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Section: Introductionmentioning

confidence: 85%

“…All the information in the next tables has been taken from the National Agriculture and Livestock Census from 2012 [14] ( Tables 8,9,10,11,12,13,14,15,16,17,18,19).…”

Section: Appendix 1: Social Information Of Ayacuchomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Techno-economic analysis of an enhanced anaerobic digester in the Andean area of Peru

Jaeger¹,

Blanchard

2022

Int J Energy Environ Eng

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“…While biogas production decreases with temperature, this decrease is more pronounced below the mesophilic range (<25 • C) [30]. The digester design also includes a greenhouse covering the digester, which our previous research has shown can significantly increase (6.8-24.5 • C) the digester temperature and help maintain a more consistent digestion temperature throughout the day [44]. Assuming a 10-year lifetime and 8% discount rate, the discounted capital investment would be $8617.…”

Section: Scale-up Modelmentioning

confidence: 99%

Enhanced Biogas Production of Cassava Wastewater Using Zeolite and Biochar Additives and Manure Co-Digestion

2020

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Currently, there are challenges with proper disposal of cassava processing wastewater, and a need for sustainable energy in the cassava industry. This study investigated the impact of co-digestion of cassava wastewater (CW) with livestock manure (poultry litter (PL) and dairy manure (DM)), and porous adsorbents (biochar (B-Char) and zeolite (ZEO)) on energy production and treatment efficiency. Batch anaerobic digestion experiments were conducted, with 16 treatments of CW combined with manure and/or porous adsorbents using triplicate reactors for 48 days. The results showed that CW combined with ZEO (3 g/g total solids (TS)) produced the highest cumulative CH4 (653 mL CH4/g VS), while CW:PL (1:1) produced the most CH4 on a mass basis (17.9 mL CH4/g substrate). The largest reduction in lag phase was observed in the mixture containing CW (1:1), PL (1:1), and B-Char (3 g/g TS), yielding 400 mL CH4/g volatile solids (VS) after 15 days of digestion, which was 84.8% of the total cumulative CH4 from the 48-day trial. Co-digesting CW with ZEO, B-Char, or PL provided the necessary buffer needed for digestion of CW, which improved the process stability and resulted in a significant reduction in chemical oxygen demand (COD). Co-digestion could provide a sustainable strategy for treating and valorizing CW. Scale-up calculations showed that a CW input of 1000–2000 L/d co-digested with PL (1:1) could produce 9403 m3 CH4/yr using a 50 m3 digester, equivalent to 373,327 MJ/yr or 24.9 tons of firewood/year. This system would have a profit of $5642/yr and a $47,805 net present value.

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“…Traditional heating methods include generation waste heat heating [4], boiler heating [5,6], active and passive solar heating [7,8], and heat pump heating [9]. Liu et al used a groundwater source heat pump to heat a 700 m 3 anaerobic digester and found that the fermentation temperature of biogas tanks could be maintained at 33-35°C in winter [10].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Heating System of Multiphase Flow Digester by Solar-Untreated Sewage Source Heat Pump

Guo

Zhou

et al. 2020

International Journal of Photoenergy

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The traditional biogas heating system has the disadvantages of a low energy efficiency ratio and high energy consumption. In this study, a solar-untreated sewage source heat pump system (SUSSHPS) was developed for heating a 12 m3 multiphase flow digester (MFD) in Suining, China. To investigate the operating effects, two modes were defined according to the solar fractions in different regions. On the basis of experimental data, thermodynamic calculations and operating simulation analysis were performed, and the solar collector area (Ac) and the minimum length of the sewage double-pipe heat exchanger (lmin) for the two modes were calculated. The results indicated that the Ac and lmin of mode 2 were larger than those of mode 1 at different solar fractions. Additionally, the results suggested that mode 1 can be used at a solar fraction of <0.33, and mode 2 can be used at a solar fraction of >0.5. Moreover, a comprehensive evaluation of different biogas heating systems was performed. Two evaluation methods were used for modeling calculations, and the results of the two methods were consistent. The SUSSHPS had the largest comprehensive evaluation value among the four systems. The proposed SUSSHPS can play a significant role in improving current biogas heating systems and promoting the development of biogas projects.

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Simulation and validation of a model for heating underground biogas digesters by solar energy

Cited by 30 publications

References 30 publications

Techno-economic analysis of an enhanced anaerobic digester in the Andean area of Peru

Techno-economic analysis of an enhanced anaerobic digester in the Andean area of Peru

Enhanced Biogas Production of Cassava Wastewater Using Zeolite and Biochar Additives and Manure Co-Digestion

Dynamic Heating System of Multiphase Flow Digester by Solar-Untreated Sewage Source Heat Pump

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