scholarly journals Solid Fraction of Digestate from Biogas Plant as a Material for Pellets Production

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5034
Author(s):  
Wojciech Czekała
Keyword(s):  
Anaerobic Digestion ◽  
Solid Fraction ◽  
Biogas Production ◽  
Biogas Plant ◽  
Biofuel Production ◽  
Energy Potential ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Solid Biofuels ◽  
Lower Heating Value

One of the anaerobic digestion process products in an agricultural biogas plant is digestate (digested pulp). Large quantities of digestate generated in the process of biogas production all over the world require proper management. Fertilization is the main management of this substrate, so it is essential to look for new alternatives. The work aims to determine and discuss the possibilities of using digestate solid fraction (DSF) for pellets as biofuel production. Pellets from DSF alone and pellets with sawdust, grain straw additives were analyzed. The lower heating value (LHV) based on the dry matter for all analyzed pellets ranged from 19,164 kJ∙kg−1 to 19,879 kJ∙kg−1. The ash content was similar for all four samples and ranged from 3.62% to 5.23%. This value is relatively high, which is related to the degree of fermentation in the anaerobic digestion process. The results showed that the DSF substrate after the anaerobic digestion process still has energy potential. Analyzing those results, it seems that DSF can be a highly valuable substrate for solid biofuels production.

scholarly journals An Incubation System to Enhance Biogas and Methane Production: A Case Study of an Existing Biogas Plant in Umbria, Italy

Processes ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 925 ◽  
Author(s):  
Federica Liberti ◽  
Valentina Pistolesi ◽  
Mawaheb Mouftahi ◽  
Nejib Hidouri ◽  
Pietro Bartocci ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Biogas Production ◽  
Pilot Scale ◽  
Biogas Plant ◽  
Industrial Scale ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Incubation System ◽  
Continuously Stirred Tank Reactor

The pre-incubation of digestate and recycling of microbes inside a continuously stirred tank reactor (CSTR) are effective ways to optimize the anaerobic digestion process and improve the performance of biogas and methane production, also in existing biogas plants. In this study, a digestate incubation system using a nutrient mix to boost the activity of microbes was coupled to a CSTR to boost biogas and methane production. This system has been tested both on a lab scale and on an industrial scale. On a pilot scale, the system achieved an increase of +16.47 v% in biogas production with respect to the conventional anaerobic digestion process, and an increase of +2 v% in methane content (from 65.94 v% to 67.84 v%). On an industrial scale, the use of this incubation reactor with a capacity of 1 m3 has led to an increase in methane yield of 12 v%. This system allows to maintain the syntrophic relationship between acid-producing bacteria and methanogens and contemporary push the development of methanogens. Moreover, it is an economic system to be integrated into an existing biogas plant given the small volume and the simplicity of the incubation reactor.

scholarly journals Operational Parameters of Biogas Plants: A Review and Evaluation Study

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3761 ◽  
Author(s):  
Abdullah Nsair ◽  
Senem Onen Cinar ◽  
Ayah Alassali ◽  
Hani Abu Qdais ◽  
Kerstin Kuchta
Keyword(s):  
Anaerobic Digestion ◽  
Review Paper ◽  
Biogas Production ◽  
Evaluation Study ◽  
Biogas Plant ◽  
Operational Parameters ◽  
Digestion Process ◽  
Design Considerations ◽  
Biogas Plants ◽  
Main Factors

The biogas production technology has improved over the last years for the aim of reducing the costs of the process, increasing the biogas yields, and minimizing the greenhouse gas emissions. To obtain a stable and efficient biogas production, there are several design considerations and operational parameters to be taken into account. Besides, adapting the process to unanticipated conditions can be achieved by adequate monitoring of various operational parameters. This paper reviews the research that has been conducted over the last years. This review paper summarizes the developments in biogas design and operation, while highlighting the main factors that affect the efficiency of the anaerobic digestion process. The study’s outcomes revealed that the optimum operational values of the main parameters may vary from one biogas plant to another. Additionally, the negative conditions that should be avoided while operating a biogas plant were identified.

Degradation of veterinary antibiotics during anaerobic digestion of dairy manure

2015 ◽  
Vol 10 (3) ◽  
pp. 532-537 ◽  
Author(s):  
Yumika Kitazono ◽  
Ikko Ihara ◽  
Kiyohiko Toyoda ◽  
Kazutaka Umetsu
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Dairy Manure ◽  
Antibiotic Residues ◽  
Veterinary Antibiotics ◽  
Livestock Manure ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Antibiotic Degradation

This study evaluated antibiotic degradation and biogas production during anaerobic digestion of dairy manure contained two common veterinary antibiotics at 37 °C. After 18 days of digestion, the concentration of chlortetracycline (CTC) decreased more than 80% regardless of the initial CTC concentration. The concentration of cefazolin (CEZ) decreased from 10 to 0.08 mg/L in 6 days. Less than 50 mg/L CTC and 10 mg/L CEZ had negligible impact on biogas production during anaerobic digestion process. The result showed that the anaerobic digestion has a potential to degrade antibiotic residues in livestock manure.

The anaerobic digestion process of biogas production from food waste: Prospects and constraints

2019 ◽  
Vol 8 ◽  
pp. 100310 ◽  
Author(s):  
Sagor Kumar Pramanik ◽  
Fatihah Binti Suja ◽  
Shahrom Md Zain ◽  
Biplob Kumar Pramanik
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Biogas Production ◽  
Anaerobic Digestion Process ◽  
Digestion Process

Anaerobic Digestion Process of Food Waste for Biogas Production: A Simulation Approach

2019 ◽  
Vol 42 (9) ◽  
pp. 1834-1839 ◽  
Author(s):  
Noorlisa Harun ◽  
Zuraini Hassan ◽  
Norazwina Zainol ◽  
Wan Hanisah Wan Ibrahim ◽  
Haslenda Hashim
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Biogas Production ◽  
Simulation Approach ◽  
Anaerobic Digestion Process ◽  
Digestion Process

Methanogenic Performance of Pulp and Paper Mill Sludge Using Anaerobic Digestion Process

2014 ◽  
Vol 675-677 ◽  
pp. 680-684
Author(s):  
Zhao Mei Du ◽  
Qin Wu ◽  
Xiao Qin Zhang
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Paper Mill ◽  
Pulp And Paper ◽  
Wastewater Sludge ◽  
Pulp And Paper Mill ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Feeding Modes ◽  
Paper Mill Wastewater

The feasibility of pulp and paper mill wastewater sludge as substrates for biogas production was evaluated in labrotory scale. Also the influence of pre-acidification, feeding modes and sludge concentration on anaerobic digestion system were studied.

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