Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Civil and Environmental Engineering (14)
- Environmental Engineering (12)
- Environmental Sciences (5)
- Physical Sciences and Mathematics (5)
- Civil Engineering (4)
-
- Oil, Gas, and Energy (4)
- Mechanical Engineering (3)
- Sustainability (3)
- Bioresource and Agricultural Engineering (2)
- Life Sciences (2)
- Microbiology (2)
- Agribusiness (1)
- Agricultural Economics (1)
- Agriculture (1)
- American Studies (1)
- Animal Sciences (1)
- Architecture (1)
- Arts and Humanities (1)
- Biochemical and Biomolecular Engineering (1)
- Biological Engineering (1)
- Biomedical Engineering and Bioengineering (1)
- Business (1)
- Chemical Engineering (1)
- Chemistry (1)
- Dairy Science (1)
- Electrical and Computer Engineering (1)
- Energy Systems (1)
- Environmental Design (1)
- Environmental Health and Protection (1)
- Institution
- Publication Year
Articles 1 - 19 of 19
Full-Text Articles in Engineering
Understanding Ch4 Emissions From Compostables: An Exploration Of Local Ch4 Emissions From Landfilled Compostables And The Efficacy Of Emission Mitigation Via Anaerobic Biogas Digestion, Jordan-Yoosuf Aljbour
Understanding Ch4 Emissions From Compostables: An Exploration Of Local Ch4 Emissions From Landfilled Compostables And The Efficacy Of Emission Mitigation Via Anaerobic Biogas Digestion, Jordan-Yoosuf Aljbour
University Honors Theses
Methane (CH4) is the second most abundant anthropogenic greenhouse gas within the atmosphere, comprising ~16% of the total anthropogenic greenhouse gas composition on Earth. It has an ~12-year lifetime relative to its eventual oxidation via reaction with tropospheric hydroxyl radicals (OH), and has a 100-year indirect global warming potential (GWP) approximately ranging between 28-36 [Environmental Protection Agency, 2021]. In recent years, the observed average global concentration of atmospheric CH4 has increased by ~11.0% from 2020 (~15.3 ppb) to 2021 (~17.0 ppb) [Dlugokencky et al., 1994; National Oceanic and Atmospheric Administration, 2022]. With …
Biochar Application In Anaerobic Digestion Of Food Waste For Inhibition Mitigation And Biogas Production Improvement, Mehrsa Hosseini
Biochar Application In Anaerobic Digestion Of Food Waste For Inhibition Mitigation And Biogas Production Improvement, Mehrsa Hosseini
Major Papers
The production of large quantities of food waste due to population growth is a serious global issue. Improper management of food waste and the deficiency of appropriate administration approaches have adversely affected the environment and society. Traditional methods of disposal (i.e., landfill) and treatment (i.e., incineration and composting) are not considered efficient for food waste management. Therefore, an efficient and cost-effective alternative is anaerobic digestion (AD), a dual-purpose and mature technology for digesting and converting food waste into renewable energy and valuable chemicals. However, Anaerobic digestion (AD) as an environmentally friendly and widely applied technology still faces some challenges, including …
Techno-Economic Feasibility Of Electrifying Food Markets In Nigeria With Biogas Hybrid Mini-Grids, Demi Temitope Ogunwo
Techno-Economic Feasibility Of Electrifying Food Markets In Nigeria With Biogas Hybrid Mini-Grids, Demi Temitope Ogunwo
Cal Poly Humboldt theses and projects
This thesis explored the feasibility of electrifying a food market in an urban city in Nigeria with a hybrid biogas-powered mini-grid. Under the Energizing Economies Initiative of the Rural Electrification Agency of Nigeria, nine markets in the country currently receive constant access to electricity via hybrid mini-grid systems. As a majority of these systems are diesel-solar-battery systems, this thesis explored the use of biogas generators as a substitute for diesel generators in hybrid mini-grids for food markets. A fruit and vegetable market in Ketu, Lagos was used as a case study for the research. The research for this thesis was …
Integrated Processing Of Municipal Solid Waste For Maximizing Waste Reduction, Carbon Recovery And Fuel Production, Kameron J. King
Integrated Processing Of Municipal Solid Waste For Maximizing Waste Reduction, Carbon Recovery And Fuel Production, Kameron J. King
Civil & Environmental Engineering Theses & Dissertations
Nationally and internationally, waste generation is increasing and along with it negative environmental impacts. Many people think waste ends at disposal; however, environmental impacts have already begun. Unfortunately, 50% of waste ends up in a landfill which is the third largest source of human related methane emissions and a leading cause of global climate change. This study investigated a novel waste management strategy in hopes of mitigating negative environmental effects caused by conventional waste management practices. The novelty of the study lies in the development of an integrated method of hydrothermal carbonization and an anaerobic digestion (HTC + AD) process …
Bridging Thermochemical And Biochemical Conversion: Impact Of Biochar Addition On The Anaerobic Digestion Of Aqueous Pyrolysis Condensate, Neha Batta
Electronic Thesis and Dissertation Repository
Profitable treatment of low value waste biomass is one of the biggest challenges of the industry. Where most of the current treatment strategies, such as pyrolysis, are efficient in complete breakdown of hard to synthesize, low value waste biomass such as lignocellulosic wastes, it leads to the generation of secondary waste thereby compromising its efficiency. The aim of this research is to utilize the aqueous pyrolysis condensate as a feedstock for anaerobic digestion, previously adapting the microbial consortia to the acidity and other potential organic inhibitors present in the APC, to produce energy in the form of biogas following the …
Pilot-Scale Test Of Water Wash Carbon Dioxide Absorption System For Purifying Landfill Gas At Jones Island Wastewater Reclamation Facility, Rebecca Schruender
Pilot-Scale Test Of Water Wash Carbon Dioxide Absorption System For Purifying Landfill Gas At Jones Island Wastewater Reclamation Facility, Rebecca Schruender
Theses and Dissertations
Biogas, a product of the digestion of organic material, consists primarily of methane and carbon dioxide. By purifying raw biogas, or removing the carbon dioxide, it can be upgraded to biomethane, which can be used to generate heat and electricity or as a substitute for natural gas. An effective method of biogas purification is the water wash process, which consists of an absorption column in which a stream of biogas runs counter-current to a stream of water. The carbon dioxide dissolves in the water, increasing the methane concentration of the gas. A pilot scale system was operated at Jones Island …
Optimizing Hydrogen Sulfide Removal And Biogas Production Using The Water Wash Method, Brian Leightner
Optimizing Hydrogen Sulfide Removal And Biogas Production Using The Water Wash Method, Brian Leightner
Theses and Dissertations
Biogas forms from decomposing organic material in agricultural digesters, landfills, and wastewater treatment plant digesters. Biogas is mostly composed of methane, and can be used as a carbon-based fuel. Microorganisms that consume organics in these waste streams also produce hydrogen sulfide (H2S) as part of the biogas, in varying trace amounts. H2S is corrosive to engines and pipes for machinery, a human health hazard when inhaled, and an aquatic hazard when dissolved in water. Water washing is an absorption process that dissolves hydrogen sulfide and other water soluble compounds in this process and carries it away from the gas, thereby …
Optimization Of Biogas Production By Use Of A Microbially Enhanced Inoculum, Anna Doloman
Optimization Of Biogas Production By Use Of A Microbially Enhanced Inoculum, Anna Doloman
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A renewable energy source, biogas, comprises of methane (80%) and carbon dioxide (15%), and is a great alternative to the conventional fossil-based fuels, such as coal, gas and oil. Biogas is created during anaerobic biological digestion of waste materials, such as landfill material, animal manure, wastewater, algal biomass, industrial organic waste etc. A biogas potential from organic waste in the United States is estimated at about 9 million tons per year and technology allows capture of greenhouse gases, such as methane and carbon dioxide, into a form of a fuel. In the light of global climate change and efforts to …
Evaluación De La Torta De Palmiste En La Obtención De Biogás, Mediante El Uso Del Estiércol Vacuno Como Fuente De Bacterias Anaeróbicas, Laura Daniela Medina Zárate, Ingrid Katerin Toro Rocha
Evaluación De La Torta De Palmiste En La Obtención De Biogás, Mediante El Uso Del Estiércol Vacuno Como Fuente De Bacterias Anaeróbicas, Laura Daniela Medina Zárate, Ingrid Katerin Toro Rocha
Ingeniería Ambiental y Sanitaria
El palmiste es un subproducto de la extracción del aceite de palma, éste está contenido dentro del fruto de la palma africana. La producción en el país para el año 2017 fue de 325.978 toneladas, debido a esto se considera en este proyecto el aprovechamiento del palmiste como alternativa de materia prima, generando una opción que permite disminuir la producción de este residuo y dar apoyo frente a la conservación del medio ambiente, producción de energía limpia y abono orgánico. Con este proyecto se evaluó el palmiste en la obtención de Biogás, mediante el uso del estiércol vacuno en el …
Biogas Quality Improvement Using Water Wash And Phosphorus Recovery As Struvite In Jones Island Wwtp, Md Abul Bashar
Biogas Quality Improvement Using Water Wash And Phosphorus Recovery As Struvite In Jones Island Wwtp, Md Abul Bashar
Theses and Dissertations
Raw biogas from anaerobic digestion has a methane content of 50 to 60% and a carbon dioxide content of 40 to 50% on a molar basis (Bortoluzzi, Gatti, Sogni, & Consonni, 2014). Milwaukee Metropolitan Sewerage District (MMSD)’s Jones Island Waste Water Treatment Plant (WWTP) uses the biogas supplied from South Shore WWTP in drying Milorganite, a slow-release phosphate fertilizer. But with only 45% methane, the gas cannot be used for sophisticated purposes. To maximize its potential as energy source, the methane content must be upgraded to its market competitor natural gas. Based on simulation results from Aspen Plus software - …
Impact Of Heavy Metal Contamination From Coal Flue Gas On Microalgae Biofuel And Biogas Production Through Multiple Conversion Pathways, Derek E. Hess
Impact Of Heavy Metal Contamination From Coal Flue Gas On Microalgae Biofuel And Biogas Production Through Multiple Conversion Pathways, Derek E. Hess
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Microalgae has a great potential to help alleviate the world's current dependence on fossil fuels. Microalgae is a single celled organism that produces lipids as a food storage device much like humans and animals store fat. These lipids are a kind of oil that when harvested can be utilized as biofuel.
As the technology surrounding using microalgae as a source of biofuel has advanced key bottlenecks in the eventual large-scale production of microalgae based biofuel have been discovered. One of these bottlenecks is the need to cheaply supply carbon for microalgae growth. One idea that has emerged as a plausible …
Sizing An Anaerobic Digester In A Rural Developing World Community: Does Household Fuel Demand Match Greenhouse Gas Production?, Ronald Keelan Greenwade
Sizing An Anaerobic Digester In A Rural Developing World Community: Does Household Fuel Demand Match Greenhouse Gas Production?, Ronald Keelan Greenwade
USF Tampa Graduate Theses and Dissertations
Anaerobic digestion is the process by which organic carbon is converted into biogas in the form of carbon dioxide (CO2) and methane (CH4). Both of these products are greenhouse gases that contribute to global warming. Therefore if anaerobic reactors are improperly maintained and biogas is leaked or intentionally released into the atmosphere because biogas production exceeds household demand, these reactors may become generators of greenhouse gas emissions instead of sustainable energy producers. The objective of this research was to develop a framework to assess if the demand for biogas by a rural adopter of an anaerobic …
Two-Phase Anaerobic Digestion To Reduce The Nox Emission Potential Of Biogas, Nathaniel Manuel Olivas
Two-Phase Anaerobic Digestion To Reduce The Nox Emission Potential Of Biogas, Nathaniel Manuel Olivas
Master's Theses
Anaerobic digestion can be used to decrease the mass of organic wastes to be disposed of while producing useful biogas (CH4 and CO2) for heat or power production, but in air basins with strict emissions limits, biogas combustion is difficult to implement due to the high costs of controlling NOx emissions. NOx production can be minimized by blending H2 gas with CH4 at a volume ratio of 15:85 H2:CH4, which allows burning at ultra-lean air-to-fuel ratios. For biogas systems, a potential low-cost NOx control strategy is to produce H2-CH …
Methane Production By A Packed-Bed Anaerobic Digester Fed Dairy Barn Flush Water, Sean Richard Thomson
Methane Production By A Packed-Bed Anaerobic Digester Fed Dairy Barn Flush Water, Sean Richard Thomson
Master's Theses
Packed-bed digesters are an alternative to covered lagoon digesters for methane production and anaerobic treatment of dilute wastewaters such as dairy barn flush water. The physical media of packed-beds retain biofilms, often allowing increased treatment rates. Previous studies have evaluated several types of media for digestion of dilute wastewaters, but cost and media fouling have setback commercial development. A major operational cost has been effluent recirculation pumping.
In the present effort, a novel approach to anaerobic digestion of flush dairy water was developed at pilot-scale: broken walnut shells were used as a low-cost packed-bed medium and effluent recirculation was replaced …
Co-Firing Biomass With Biogas In Cookstoves With A Fan, Manil Poudyal
Co-Firing Biomass With Biogas In Cookstoves With A Fan, Manil Poudyal
Theses and Dissertations
Co-firing is a combustion process in which more than one type of fuel is used. In many cases, co-firing reduces fuel costs and/or reduces the environmental impact. The objective of this research was to test the hypothesis that adding biogas to be co-fired with biomass in a traditional cookstove reduces indoor air pollution and increases the combustion efficiency. The impact of co-firing on indoor air pollution is assessed by comparing the concentrations of carbon monoxide and particulate matter in the exhaust stream of a co-fired cookstove to a cookstove fueled with biomass alone. The concentrations of each of these pollutants …
Comportamiento De La Eficiencia De Un Reactor De Lecho Granular Expandido (Egsb) Conforme A La Implementación Del Sello Hidráulico, Sebastián Andrés Sosa Acosta, Paola Catalina Laverde Barrero
Comportamiento De La Eficiencia De Un Reactor De Lecho Granular Expandido (Egsb) Conforme A La Implementación Del Sello Hidráulico, Sebastián Andrés Sosa Acosta, Paola Catalina Laverde Barrero
Ingeniería Ambiental y Sanitaria
El presente documento tiene como finalidad determinar la incidencia que tiene la ubicación del sello hidráulico para extraer el biogás generado por un reactor anaerobio de lecho expandido granular EGSB (del inglés Expanded granular sludge bed) para garantizar la generación de la interfase gas-líquido dentro de la campana trifásica y con ello su incidencia en la eficiencia de remoción de la DQO. La investigación se llevó a cabo en la planta piloto de la Universidad de la Salle sede Candelaria, donde está ubicado el reactor. Para empezar se verificó los parámetros de diseño del reactor EGSB piloto, acompañado de pruebas …
Investigation Of Microalgae Cultivation And Anaerobic Codigestion Of Algae And Sewage Sludge For Wastewater Treatment Facilities, Meng Wang
Open Access Dissertations
The main goals of this research are to investigate the anaerobic digestibility of algae and to investigate the effects of growth media on the growth rates, nutrient removal kinetics, and extracellular polymeric substances (EPS) characteristics of wild type green algae. Anaerobic co-digestion of algae with sewage sludge is proposed to improve the digestibility of algae. It is hypothesized that the addition of sewage sludge improves the hydrolysis rate of algae, which is often the rate-limiting step for anaerobic digestion. It is also hypothesized that the composition and concentration of nutrients in growth media will affect the kinetics of nutrient removal …
Effects Of Moisture Augmentation Of Municipal Solid Waste Through Addition Of Food Waste Or Wastewater Treatment Biosolids On Bio-Gas Formation For Power Generation, Jared Michael Gore
Effects Of Moisture Augmentation Of Municipal Solid Waste Through Addition Of Food Waste Or Wastewater Treatment Biosolids On Bio-Gas Formation For Power Generation, Jared Michael Gore
UNLV Theses, Dissertations, Professional Papers, and Capstones
An investigation into the effect of moisture augmentation by manipulation of food waste proportion or wastewater treatment plant biosolids proportion was undertaken to determine the effects on production of methane and other biogases from municipal solid waste (MSW). Laboratory microcosm experiments were performed to determine the effect of various proportions of influent waste streams on the production of biogas. Results indicated that moisture augmentation through the addition of food waste to MSW increases the overall bio-gas and hydrogen gas formed during fermentation. Moisture augmentation through addition of wastewater treatment bio-solids lead to inconclusive results. Addition of food waste to MSW …
Design Of Small Scale Anaerobic Digesters For Application In Rural Developing Countries, Laurel Erika Rowse
Design Of Small Scale Anaerobic Digesters For Application In Rural Developing Countries, Laurel Erika Rowse
USF Tampa Graduate Theses and Dissertations
The high incidence of upper respiratory diseases, contamination of waterways due to pathogens and nutrients from human and animal wastes, unsustainable deforestation, gender disparities in burden of disease due to unequal exposure to indoor air pollutants, and carbon black emissions from the burning of solid fuels are interrelated problems in many developing countries. Small scale anaerobic digestion provides a means of alleviating these problems by treating livestock waste onsite to produce biogas (methane and carbon dioxide) in rural areas in developing countries. Fuel can then be used for cooking, lighting, and heating. Methane fuel is an alternative to traditional three-stone …