Article
Agricultural Engineering
M. Orive, M. Cebrian, J. Amayra, J. Zufia, C. Bald
Summary: An integrated valorisation scheme of olive pomace was developed in this study, including polyphenol extraction and continuous anaerobic digestion of dephenolised two-phase olive pomace. Economic feasibility assessment showed that this method is attractive, with a Net Present Value (NPV) of 1,493,234 and Internal Return Rate (IRR) of 12.8%.
BIOMASS & BIOENERGY
(2021)
Article
Microbiology
Sotirios D. Kalamaras, Maria Lida Christou, Christos A. Tzenos, Sotirios Vasileiadis, Dimitrios G. Karpouzas, Thomas A. Kotsopoulos
Summary: This study investigated the role of the bioaugmented critical biomass in addressing ammonia inhibition in anaerobic reactors used for biogas production. It was found that injecting a volume equal to 65.62% of the total working reactor volume resulted in the best methane production. The dominant microbial member in all reactors was Methanosaeta.
Article
Multidisciplinary Sciences
Jake A. K. Elliott, Andrew S. Ball, Kalpit Shah
Summary: Biogas production from wastewater is an effective method for industrial sites to achieve the UN Sustainable Development Goals and recover valuable resources. This study investigated the use of data from municipal wastewater service providers to classify and screen waste producers for potential biogas resource recovery. The results showed that certain industrial wastewater streams had high biomethane yields, which could save costs and reduce greenhouse gas emissions. This knowledge can be used to select sites for future resource recovery, leading to economic, environmental, and climate change mitigation benefits.
Review
Environmental Sciences
Luong N. Nguyen, Jeevan Kumar, Minh T. Vu, Johir A. H. Mohammed, Nirenkumar Pathak, Audrey S. Commault, Donna Sutherland, Jakub Zdarta, Vinay Kumar Tyagi, Long D. Nghiem
Summary: Anaerobic co-digestion (AcoD) and biogas upgrade have enabled many wastewater treatment plants to become net energy producers. While water scrubbing is currently the most widely used technology, significant market growth in membrane separation has been observed, with further advancements in materials engineering and sciences expected to enhance membrane separation competitiveness in biogas upgrading.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Konstantina Tsigkou, Antonia Terpou, Laura Treu, Panagiotis G. Kougias, Michael Kornaros
Summary: The study focused on utilizing olive mill wastewater for efficient biogas production under thermophilic conditions, testing its performance and analyzing the microbial community. Results showed potential for further exploitation of olive mill wastewater for biogas production.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Agricultural Engineering
Shilan Elyasi, Narges Fallah, Babak Bonakdarpour, Amir Mahboubi, Mohammad J. Taherzadeh
Summary: The study demonstrated the efficient anaerobic removal of styrene from wastewater at 35 degrees C with ethanol as co-substrate and co-solvent, leading to a high methane yield. However, at high styrene concentrations, methane production and microbial products sharply decreased.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Thobias Pereira Silva, Mauricio Guimaraes de Oliveira, Jose Marcos Marques Mourao, Andre Bezerra dos Santos, Erlon Lopes Pereira
Summary: This study developed a mathematical model based on Monte Carlo simulation to predict the energy potential of biogas produced in an up-flow anaerobic sludge blanket (UASB) reactor treating swine wastewater (SWW). Lab-scale experiments and literature information were used to determine the energy potential of SWW at different organic loading rates (OLRs). The model allowed an estimation close to reality, with reduced errors, making it a relevant tool for entrepreneurship and energy self-sufficiency projects.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Energy & Fuels
B. Deepanraj, N. Senthilkumar, J. Ranjitha
Summary: The study found that the biogas production from rapeseed oil cake was highest at a solid concentration of 20%, followed by 25%, 15% and 10%. When using the modified Gompertz model, there were smaller differences between measured and predicted biogas production compared to the other two models.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Engineering, Environmental
Pornwimon Wadchasit, Wantanasak Suksong, Sompong O-Thong, Kamchai Nuithitikul
Summary: A novel reactor was developed for simultaneous biogas production from solid and liquid anaerobic digestions, with the potential to enhance methane yields through temperature adjustments and NaOH pretreatment. The reactor showed similarities in bacterial and archaeal communities between the outer and inner digestions, and offered energy savings, cost reduction, and increased methane production.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Salome M. Duarte, Erika Sinisgalli, Ana J. Cavaleiro, Lorenzo Bertin, M. Madalena Alves, M. Alcina Pereira
Summary: This study demonstrates that biogas recirculation in the biogas-lift bioreactor facilitated the degradation of waste frying oils, most likely due to the selective enrichment of hydrogenotrophic methanogens.
Article
Agricultural Engineering
Fangyi Tang, Jun Tian, Nengwu Zhu, Yunqin Lin, Haomin Zheng, Zhiyong Xu, Weizhen Liu
Summary: This study investigates the influence of the mixing ratio of ammoniated straw to biogas residue on the stability and methane yield of dry anaerobic digestion and analyzes the structure of the microbial community over time. The results show that the reactor with a ratio of 3:3 yielded the highest methane production, with bacteria being the dominant species. Methanosarcina and acid-tolerant Methanobacterium played important roles in anaerobic digestion and methane production.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
Fuad Ameen, J. Ranjitha, Nazmul Ahsan, Vijayalakshmi Shankar
Summary: The co-digestion of microbial biomass with animal manures showed higher biogas production compared to digestion of animal manure alone. A three-stage anaerobic digester designed in the study had an average methane yield of 0.442 L/gVS and achieved a reduction of about 68% in volatile solids.
Article
Engineering, Environmental
Thalita Gouveia Castilho, Jose Alberto Domingues Rodrigues, Joan Garcia, Eduardo Lucas Subtil
Summary: In recent years, research has shown that the addition of conductive materials can significantly improve anaerobic digestion and methane production. However, there are still questions regarding the mechanism and impact of material properties on methanogenic pathways. A systematic review and statistical analysis of recent studies found that the use of conductive materials is associated with changes in the microbial community and that millimeter-scale materials may be more effective in increasing methane production. Overall, the use of conductive materials shows promise in improving anaerobic digestion and methane production.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Agricultural Engineering
Neha Srivastava, Kumar Rohit Srivastava, Farkad Bantun, Akbar Mohammad, Rajeev Singh, Dan Bahadur Pal, P. K. Mishra, Shafiul Haque, Vijai Kumar Gupta
Summary: Biogas production from anaerobic digestion of organic wastes has been improved by using CuO/Cu2O based nanocatalyst with pressmud as a substrate. The study shows that using 1.0% CuO/Cu2O based nanocatalyst in anaerobic digestion process, a cumulative biogas production of 224.7 mL CH4 /g VS could be achieved after 42 days.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
Salih Sozer
Summary: Energy is strategically important for all countries. The use of new energy and renewable energy resources should be expanded to ensure the long-term utilization of limited energy resources. Organic residues produced in agricultural areas and agro-industrial activities can be converted into useful energy by evaluating biomass resources and bringing them into the economy.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Review
Biotechnology & Applied Microbiology
Rosina Nkuna, Ashira Roopnarain, Charles Rashama, Rasheed Adeleke
Summary: Through studying various specific factors of AD and their relationship with OLR, managing an AD plant by monitoring and controlling OLR only can lead to quicker decision-making and minimal troubleshooting steps.
CRITICAL REVIEWS IN BIOTECHNOLOGY
(2022)
Article
Environmental Sciences
Charles Rashama, Grace N. Ijoma, Tonderayi S. Matambo
Summary: A predictive model for biomethane potential (BMP) of avocado oil processing by-products was developed, and the biodegradation kinetics models for the same by-products were evaluated. The study concluded that despite the high presence of phytochemicals, avocado oil processing decanter pomaces and wastewater can potentially be digested anaerobically to produce biomethane. However, an economically viable biodigester using avocado seed or peels would require substrate pretreatment.
WASTE AND BIOMASS VALORIZATION
(2022)
Article
Environmental Sciences
Charles Rashama, Grace N. Ijoma, Tonderayi S. Matambo
Summary: This study evaluated the phytochemicals in avocado oil processing byproducts and made inferences on their use in anaerobic digestion for biogas recovery. Phenolics were found to be the dominant phytochemicals in all byproducts, followed by saponins and alkaloids. The detailed characterization of these substrates provides valuable information for troubleshooting and optimization of biodigesters using these substrates.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2022)
Article
Microbiology
Rosina Nkuna, Grace N. Ijoma, Tonderayi S. Matambo
Summary: This study reveals the unique microbial life in mine tailings, and demonstrates the importance of including a metal-chelating step using EDTA before DNA extractions from metal-rich environments. It also suggests the need for optimization and caution against high EDTA concentrations negatively affecting DNA recovery.
Review
Multidisciplinary Sciences
Grace N. Ijoma, Asheal Mutungwazi, Thulani Mannie, Weiz Nurmahomed, Tonderayi S. Matambo, Diane Hildebrandt
Summary: This article estimates the potential energy that can be generated from wastewater treatment plants in Sub-Saharan Africa and highlights the importance of utilizing this energy.
Review
Chemistry, Multidisciplinary
Chike George Okoye-Chine, Kabir Otun, Nothando Shiba, Charles Rashama, Samson Nnaemeka Ugwu, Helen Onyeaka, Chinedu T. Okeke
Summary: Converting CO2 into fuels is a promising way to address global warming and meet high energy demand, but it also faces some challenges.
JOURNAL OF CO2 UTILIZATION
(2022)
Review
Green & Sustainable Science & Technology
Emmanuel O. Fenibo, Grace N. Ijoma, Weiz Nurmahomed, Tonderayi Matambo
Summary: Chemotherapy in modern agriculture has led to negative effects such as the extinction of beneficial species and environmental pollution. Biopesticides are now being considered as a solution, and their range and effectiveness in controlling pests and promoting sustainable agriculture are being studied. Compared to synthetic pesticides, biopesticides offer similar protection against most pests, but may not be as effective against certain specific pests.
Article
Energy & Fuels
Grace N. Ijoma, Henry J. O. Ogola, Charles Rashama, Tonderayi Matambo
Summary: This study evaluated the effects of phytochemicals on the microbial community structure and methane production efficiency of different avocado oil processing wastes using high-throughput metagenomic sequencing and physicochemical analyses. The results showed that phytochemicals had a significant negative impact on methane production, and different wastes exhibited different methane production patterns. Pseudomonas, Romboutsia, Paeniclostridium, and Methanocorpusculum, Methanosaeta, Methanoregula, and Methanosarcina were the dominant bacteria and archaea. In conclusion, this is the first report on the potential negative impact of phytochemicals on the microbial community structure and biomethane production from avocado processing wastes.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Biotechnology & Applied Microbiology
Trevor M. Simbayi, Charles Rashama, Ayo A. Awosusi, Rosina Nkuna, Riann Christian, Tonderayi S. Matambo
Summary: The biodegradability of water hyacinth was studied for biogas and biofertilizer production under mesophilic conditions. It was found that water hyacinth has a low biodegradability of 27% when monodigested, while in a 3:1 ratio with cow manure, the biodegradability increases to 46%. The Gompertz kinetic model had superior parameters for the water hyacinth-cow manure combined substrate digestion.
FERMENTATION-BASEL
(2023)
Article
Multidisciplinary Sciences
Henry Joseph Oduor Ogola, Grace N. Ijoma, Joshua Nosa Edokpayi
Summary: The natural wetlands in the Limpopo province of South Africa are vital for preserving biodiversity and supporting agricultural production. However, these wetlands are facing increasing pressures from human activities and climate change. This study presents the first report on the microbial and functional diversity of sediment microbiomes in unprotected arid-tropical wetlands in South Africa, providing crucial baseline information.
