A review on biogas upgrading in anaerobic digestion systems treating organic solids and wastewaters via biogas recirculation

2021 ◽  
pp. 126412
Author(s):  
Tian Yuan ◽  
Zhenya Zhang ◽  
Zhongfang Lei ◽  
Kazuya Shimizu ◽  
Duu-Jong Lee
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Upgrading ◽  
Organic Solids

scholarly journals An electrode-assisted anaerobic digestion process for the production of high-quality biogas

2019 ◽  
Vol 79 (11) ◽  
pp. 2145-2155 ◽  
Author(s):  
K. Yanuka-Golub ◽  
K. Baransi-Karkaby ◽  
A. Szczupak ◽  
L. Reshef ◽  
J. Rishpon ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
High Efficiency ◽  
Community Analysis ◽  
Microbial Community Analysis ◽  
High Rate ◽  
Production Yield ◽  
Organic Load ◽  
Electrolysis Cell ◽  
Biogas Upgrading ◽  
Ch4 Production

Abstract Biogas is a sustainable, renewable energy source generated from organic waste degradation during anaerobic digestion (AD). AD is applied for treating different types of wastewater, mostly containing high organic load. However, AD practice is still limited due to the low quality of the produced biogas. Upgrading biogas to natural gas quality (>90% CH4) is essential for broad applications. Here, an innovative bio-electrochemically assisted AD process was developed, combining wastewater treatment and biogas upgrading. This process was based on a microbial electrolysis cell (MEC) that produced hydrogen from wastewater at a relatively high efficiency, followed by high-rate anaerobic systems for completing biodegradation of organic matter and an in situ bio-methanation process. Results showed that CH4 production yield was substantially improved upon coupling of the MEC with the AD system. Interestingly, CH4 production yield increase was most notable once circulation between AD and MEC was applied, while current density was not markedly affected by the circulation rates. The microbial community analysis confirmed that the MEC enhanced hydrogen production, leading to the enrichment of hydrogenotrophic methanogens. Thus, directing soluble hydrogen from the MEC to AD is plausible, and has great potential for biogas upgrading, avoiding the need for direct hydrogen harvesting.

scholarly journals H2 addition through a submerged membrane for in-situ biogas upgrading in the anaerobic digestion of sewage sludge

2019 ◽  
Vol 280 ◽  
pp. 1-8 ◽  
Author(s):  
Natalia Alfaro ◽  
María Fdz-Polanco ◽  
Fernando Fdz-Polanco ◽  
Israel Díaz
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Biogas Upgrading ◽  
H2 Addition

Coupling biogas recirculation with FeCl3 addition in anaerobic digestion system for simultaneous biogas upgrading, phosphorus conservation and sludge conditioning

2020 ◽  
Vol 315 ◽  
pp. 123811
Author(s):  
Tian Yuan ◽  
Yinxin Wang ◽  
Marjangul Nuramkhaan ◽  
Xuezhi Wang ◽  
Zhenya Zhang ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Upgrading ◽  
Sludge Conditioning

A combination anaerobic digestion scheme for biogas production from dairy effluent—CSTR and ABR, and biogas upgrading

2018 ◽  
Vol 111 ◽  
pp. 241-247 ◽  
Author(s):  
Lars Jürgensen ◽  
Ehiaze Augustine Ehimen ◽  
Jens Born ◽  
Jens Bo Holm-Nielsen
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Biogas Upgrading ◽  
Dairy Effluent

scholarly journals Innovative ex-situ biological biogas upgrading using immobilized biomethanation bioreactor (IBBR)

2020 ◽  
Vol 81 (6) ◽  
pp. 1319-1328 ◽  
Author(s):  
Katie Baransi-Karkaby ◽  
Mahdi Hassanin ◽  
Sharihan Muhsein ◽  
Nedal Massalha ◽  
Isam Sabbah
Keyword(s):  
Anaerobic Digestion ◽  
Natural Gas ◽  
Production Rate ◽  
Organic Waste ◽  
Consumption Rate ◽  
Energy Resource ◽  
Hydrogen Gas ◽  
Ex Situ ◽  
Biogas Upgrading ◽  
Immobilized Microorganisms

Abstract Biogas, which typically consists of about 50–70% of methane gas, is produced by anaerobic digestion of organic waste and wastewater. Biogas is considered an important energy resource with much potential; however, its application is low due to its low quality. In this regard, upgrading it to natural gas quality (above 90% methane) will broaden its application. In this research, a novel ex-situ immobilized biomethanation bioreactor (IBBR) was developed for biologically upgrading biogas by reducing CO2 to CH4 using hydrogen gas as an electron donor. The developed process is based on immobilized microorganisms within a polymeric matrix enabling the application of high recirculation to increase the hydrogen bioavailability. This generates an increase in the consumption rate of hydrogen and the production rate of methane. This process was successfully demonstrated at laboratory-scale system, where the developed process led to a production of 80–89% methane with consumption of more than 93% of the fed hydrogen. However, a lower methane content was achieved in the bench-scale system, likely as a result of lower hydrogen consumption (63–90%). To conclude, the IBBRs show promising results with a potential for simple and effective biogas upgrading.

scholarly journals In-situ biogas upgrading during anaerobic digestion of food waste amended with walnut shell biochar at bench scale

2017 ◽  
Vol 35 (6) ◽  
pp. 669-679 ◽  
Author(s):  
Jessica L Linville ◽  
Yanwen Shen ◽  
Patricia A Ignacio-de Leon ◽  
Robin P Schoene ◽  
Meltem Urgun-Demirtas
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Potassium Concentration ◽  
Operating Mode ◽  
Ash Content ◽  
Walnut Shell ◽  
Process Stability ◽  
Biogas Upgrading ◽  
Bench Scale

A modified version of an in-situ CO2 removal process was applied during anaerobic digestion of food waste with two types of walnut shell biochar at bench scale under batch operating mode. Compared with the coarse walnut shell biochar, the fine walnut shell biochar has a higher ash content (43 vs. 36 wt%) and higher concentrations of calcium (31 vs. 19 wt% of ash), magnesium (8.4 vs. 5.6 wt% of ash) and sodium (23.4 vs. 0.3 wt% of ash), but a lower potassium concentration (0.2 vs. 40% wt% of ash). The 0.96–3.83 g biochar (g VSadded)-1 fine walnut shell biochar amended digesters produced biogas with 77.5%–98.1% CH4 content by removing 40%–96% of the CO2 compared with the control digesters at mesophilic and thermophilic temperature conditions. In a direct comparison at 1.83 g biochar (g VSadded)-1, the fine walnut shell biochar amended digesters (85.7% CH4 content and 61% CO2 removal) outperformed the coarse walnut shell biochar amended digesters (78.9% CH4 content and 51% CO2 removal). Biochar addition also increased alkalinity as CaCO3 from 2800 mg L-1 in the control digesters to 4800–6800 mg L-1, providing process stability for food waste anaerobic digestion.

Using photovoltaic thermal technology to enhance biomethane generation via biogas upgrading in anaerobic digestion

2021 ◽  
Vol 235 ◽  
pp. 113965
Author(s):  
Bosheng Su ◽  
Hongsheng Wang ◽  
Xiaodong Zhang ◽  
Hongzhou He ◽  
Jieqing Zheng
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Upgrading
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