Hydrogen production by anaerobic digestion of pig manure: Effect of operating conditions

Abstract Background Increasing the efficiency of the biogas production process is possible by modifying the technological installations of the biogas plant. In this study, specific solutions based on a mathematical model that lead to favorable results were proposed. Three configurations were considered: classical anaerobic digestion (AD) and its two modifications, two-phase AD (TPAD) and autogenerative high-pressure digestion (AHPD). The model has been validated based on measurements from a biogas plant located in Poland. Afterward, the TPAD and AHPD concepts were numerically tested for the same volume and feeding conditions. Results The TPAD system increased the overall biogas production from 9.06 to 9.59%, depending on the feedstock composition, while the content of methane was slightly lower in the whole production chain. On the other hand, the AHPD provided the best purity of the produced fuel, in which a methane content value of 82.13% was reached. At the same time, the overpressure leads to a decrease of around 7.5% in the volumetric production efficiency. The study indicated that the dilution of maize silage with pig manure, instead of water, can have significant benefits in the selected configurations. The content of pig slurry strengthens the impact of the selected process modifications—in the first case, by increasing the production efficiency, and in the second, by improving the methane content in the biogas. Conclusions The proposed mathematical model of the AD process proved to be a valuable tool for the description and design of biogas plant. The analysis shows that the overall impact of the presented process modifications is mutually opposite. The feedstock composition has a moderate and unsteady impact on the production profile, in the tested modifications. The dilution with pig manure, instead of water, leads to a slightly better efficiency in the classical configuration. For the TPAD process, the trend is very similar, but the AHPD biogas plant indicates a reverse tendency. Overall, the recommendation from this article is to use the AHPD concept if the composition of the biogas is the most important. In the case in which the performance is the most important factor, it is favorable to use the TPAD configuration.

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Application of a modified Anaerobic Digestion Model 1 version for fermentative hydrogen production from sweet sorghum extract by Ruminococcus albus

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2010.01.118 ◽

2010 ◽

Vol 35 (8) ◽

pp. 3423-3432 ◽

Cited By ~ 23

Author(s):

I. Ntaikou ◽

H.N. Gavala ◽

G. Lyberatos

Keyword(s):

Anaerobic Digestion ◽

Hydrogen Production ◽

Sweet Sorghum ◽

Ruminococcus Albus ◽

Fermentative Hydrogen Production ◽

Fermentative Hydrogen

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Hydrogen Production via Catalytic Autothermal Reforming of Desulfurized Jet-A Fuel

Volume 1: Biofuels, Hydrogen, Syngas, and Alternate Fuels; CHP and Hybrid Power and Energy Systems; Concentrating Solar Power; Energy Storage; Environmental, Economic, and Policy Considerations of Advanced Energy Systems; Geothermal, Ocean, and Emerging Energy Technologies; Photovoltaics; Posters; Solar Chemistry; Sustainable Building Energy Systems; Sustainable Infrastructure and Transportation; Thermodynamic Analysis of Energy Systems; Wind Energy Systems and Technologies ◽

10.1115/es2016-59095 ◽

2016 ◽

Author(s):

Shuyang Zhang ◽

Xiaoxin Wang ◽

Peiwen Li

Keyword(s):

Energy Efficiency ◽

Hydrogen Production ◽

Hydrogen Storage ◽

Coke Formation ◽

Autothermal Reforming ◽

Operating Conditions ◽

Hydrogen Yield ◽

Fuel Conversion ◽

Optimal Operating ◽

Reaction Equilibrium

On-board hydrogen production via catalytic autothermal reforming is beneficial to vehicles using fuel cells because it eliminates the challenges of hydrogen storage. As the primary fuel for both civilian and military air flight application, Jet-A fuel (after desulfurization) was reformed for making hydrogen-rich fuels in this study using an in-house-made Rh/NiO/K-La-Ce-Al-OX ATR catalyst under various operating conditions. Based on the preliminary thermodynamic analysis of reaction equilibrium, important parameters such as ratios of H2O/C and O2/C were selected, in the range of 1.1–2.5 and 0.5–1.0, respectively. The optimal operating conditions were experimentally obtained at the reactor’s temperature of 696.2 °C, which gave H2O/C = 2.5 and O2/C = 0.5, and the obtained fuel conversion percentage, hydrogen yield (can be large than 1 from definition), and energy efficiency were 88.66%, 143.84%, and 64.74%, respectively. In addition, a discussion of the concentration variation of CO and CO2 at different H2O/C, as well as the analysis of fuel conversion profile, leads to the finding of effective approaches for suppression of coke formation.

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Production of Bio Gas from Vegetable and Flowers Wastes Using Anaerobic Digestion

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.787.803 ◽

2015 ◽

Vol 787 ◽

pp. 803-808 ◽

Cited By ~ 3

Author(s):

A. Deepanraj ◽

S. Vijayalakshmi ◽

J. Ranjitha

Keyword(s):

Anaerobic Digestion ◽

Biogas Production ◽

Research Work ◽

Pressure Gauge ◽

Pig Manure ◽

Future Research ◽

Digital Pressure ◽

Vegetable Wastes ◽

Main Component

The present research paper describes about the anaerobic digestion of vegetable (Banana, Cauliflower, potato, and sweet potato) and flower wastes (Rose, sambangi, gulmohar, marigold, golden shower tree, silk tree mimosa) in a 1L capacity of anaerobic digestor using pig manure as an inoculums. The digester was operated in the ratio of 1:1 of substrate to inoculums at RT. The substrate concentrations are varied such as 5%, 7%, and 10% was used and amount of gas produced was analysed using digital pressure gauge. The results obtained showed that, marigold flower had given higher yield of biogas than vegetable wastes and the digestion period was less. The average biogas production potential of withered flowers was observed as 14.36 g/kg in 5 days, where in case of vegetable wastes it was 10.0234 g/kg in 6 days. The study showed that flowers which are available in abundant in India is thrown away within a day, in the environment. These feedstocks are good feed stock for the production of biogas. The generation of biogas from flowers and vegetable waste upholds the concept of waste to wealth in enhancing sustainability of development. The future research work is mainly focused on the characterization of the main component present in the bio-gas using sophisticated instruments.

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Characterization, Digestibility and Anaerobic Treatment of Leachates from Old and Young Landfills

Water Science & Technology ◽

10.2166/wst.1989.0218 ◽

1989 ◽

Vol 21 (4-5) ◽

pp. 145-155 ◽

Cited By ~ 23

Author(s):

R. Méndez ◽

J. M. Lema ◽

R. Blázquez ◽

M. Pan ◽

C. Forjan

Keyword(s):

Anaerobic Digestion ◽

Anaerobic Treatment ◽

Full Scale ◽

Operating Conditions ◽

Organic Load ◽

Anaerobic Filter ◽

Standards Of Living ◽

Landfill Sites

We have evaluated the utility of applying anaerobic digestion treatment to the leachates from two landfill sites receiving solid urban refuse from populations of similar standards of living. Both tips are located in the same area and have very similar climates, but they differ as regards the length of time they have been operated. The leachates from the older tip have much lower levels of organic load, 40% of which was refractory to the anaerobic digestion treatment applied. The digestibility of leachates was studied by using a semicontinuous suspended sludge system.It was possible to remove up to 65% of the soluble COD of leachates from the young tip by means of an anaerobic filter working at HRTs less than 2 days. This system proved to be highly stable when its operating conditions were subjected to perturbations similar to those likely to be suffered by a full-scale plant.

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Effect of nano-bubble water on high solid anaerobic digestion of pig manure: Focus on digestion stability, methanogenesis performance and related mechanisms

Bioresource Technology ◽

10.1016/j.biortech.2020.123793 ◽

2020 ◽

Vol 315 ◽

pp. 123793 ◽

Cited By ~ 1

Author(s):

Yujie Fan ◽

Zhongfang Lei ◽

Xiaojing Yang ◽

Motoyoshi Kobayashi ◽

Yasuhisa Adachi ◽

...

Keyword(s):

Anaerobic Digestion ◽

Pig Manure ◽

High Solid

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Thermal hydrolysis pre-treatment to enhance anaerobic digestion of waste activated sludge. optimization of operating conditions and evaluation of alternative schemes

10.35376/10324/27641 ◽

2017 ◽

Author(s):

Leva Sapkaite

Keyword(s):

Anaerobic Digestion ◽

Activated Sludge ◽

Operating Conditions ◽

Waste Activated Sludge ◽

Thermal Hydrolysis ◽

Pre Treatment

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Nutrient solubilization and its availability following anaerobic digestion

Water Science & Technology ◽

10.2166/wst.2012.622 ◽

2013 ◽

Vol 67 (4) ◽

pp. 756-763 ◽

Cited By ~ 19

Author(s):

Chirag M. Mehta ◽

Damien J. Batstone

Keyword(s):

Anaerobic Digestion ◽

Inorganic Compounds ◽

Operating Conditions ◽

Solid Surfaces ◽

Soluble Form ◽

Acid Extraction ◽

Waste Streams ◽

Agriculture Waste ◽

Total P ◽

Mesophilic Condition

This study aims to investigate solubilization of elements (P, N, K, Ca and Mg) during anaerobic digestion (AD) of solid agriculture waste. It is important to maintain particularly phosphorous in the aqueous phase to be able to subsequently recover it in a concentrated form via crystallization. Batch AD was carried out at a mesophilic condition (37 °C) and pH 7.0 ± 0.2 on a variety of piggery and poultry solid waste streams. Less than 10% of the total P, Ca and Mg was in soluble form in the digestate. Most of the N and K remained soluble in the digestate. A bioavailability test (citric acid extraction) showed P, Ca and Mg in the digestate were totally available. Complete solubilization of P, Ca and Mg occurred below a threshold of pH 5.5. This indicates these nutrients were released during digestion, and then either bound to form inorganic compounds or adsorbed on solid surfaces in the digestate. These effects reduce the feasibility of post-digestion recovery of the nutrients via struvite crystallization. Strategies to improve nutrient solubilization and recovery during the AD include addition of complexing chemicals, operation at depressed pH, or otherwise modifying the operating conditions.

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