Renewable Gas Research Articles

How national decarbonisation scenarios can affect building refurbishment strategies

Energy transition is radically changing national energy systems. Nevertheless, the dynamics of this transformation are not considered by end-users in the design of building systems. The present work aims at assessing how the renewable share increase, in both electricity and gas grids, can affect building energy performance. To do this, building energy performance indicators, taking into account growing renewable shares, have been proposed. Four national decarbonisation scenarios have been considered. In a case-study in Italy, conventional boilers, heat pumps, combined heat and power plants and hybrid systems have been analysed. Heat pumps turn out to be the best option if the renewable penetration in the power grid is higher than 40%. The substitute natural gas deployment can increase the competitiveness of cogeneration systems, but not enough to represent the best configuration. National decarbonisation scenarios significantly affect the primary energy and emissions savings of building refurbishment strategies. Conventional indicators, taking primary energy factors as fixed, lead to correct assessment for the reference year, but are unable to describe the actual building energy performance over the system lifetime. Depending on the scenario, the average specific primary energy consumption ranges in 17% and 55% lower than the one assessed with conventional analyses.

Efficiency assessment of underground biomethanation with hydrogen and carbon dioxide in depleted gas reservoirs: A biogeochemical simulation

Underground biomethanation, which converts hydrogen and carbon dioxide to methane with the catalysis of methanogens in geological formations, has great potential for carbon dioxide utilization and sequestration, renewable natural gas production, and large-scale energy storage. However, the efficient conversion of hydrogen and carbon dioxide in a complex reservoir environment has not been explored. To address this issue, a novel biogeochemical model is developed for underground biomethanation that considers reservoir environment factors (e.g. pH, temperature, and salinity) and integrated into PHREEQC software. The biogeochemical model is validated with a laboratory experiment and utilized to investigate the effects of reservoir parameters and injection parameters on biomethanation efficiency in depleted gas reservoirs. Results show that the biomethanation efficiency is 94.2% after 360 days in both sandstone and carbonate reservoirs. Underground biomethanation can be completed in 30 days if initial biomass and optimum specific growth rate increase and decay rate decreases. Additionally, the optimal ratio of injected hydrogen and carbon dioxide for biomethanation is greater than 4:1 and increases with total pressure if it is above 70 atm. To improve the biomethanation efficiency, this study suggests utilizing geothermal energy and pre-injecting highly active methanogens cultured on the ground before mixed gas injection.

The more effective option to combat environmental degradation: Energy efficiency vs. renewable energy vs. natural gas?

Environmental degradation has become one of the major challenges facing the global community. This paper aims to explore the more effective options to combat environmental degradation by investigating the linearity and nonlinearity (trade openness set as a threshold variable) of energy efficiency, natural gas, renewable energy and ecological footprint. To this end, linear and non-linear panel models were constructed using panel data from 60 countries. The results of the linear analysis show that improving energy efficiency, and increasing the consumption of natural gas and renewable energy are conducive to inhibiting environmental degradation. Energy efficiency has the most significant negative correlation with ecological footprint, followed by renewable energy, and then natural gas, implying that improving energy efficiency and developing renewable energy is a more effective strategy to combat environmental degradation. The results of the nonlinear analysis show that there are threshold effects of trade openness between energy efficiency and ecological footprint, and between renewable energy and ecological footprint. The negative impact of both renewable energy and energy efficiency on the ecological footprint increases when trade openness exceeds the threshold. This suggests that, in terms of curbing environmental degradation, enhancing trade openness may further increase the negative impacts of energy efficiency and renewable energy on ecological footprint. At the same time, this confirms the positive role of trade openness in environmental protection.

State-of-the-art and challenges in the analysis of renewable gases.

The development of renewable and low-carbon gases for injection into the gas grid obtained by different processes such as anaerobic digestion, pyrogasification, hydrothermal gasification, and methanation, followed by upgrading steps, increases the demand for analysis and characterization in order to fully manage their integration into the gas value chain. If the analysis of the main compounds (methane, carbon dioxide, hydrogen, and carbon monoxide) is well described, the analysis of impurities in renewable gases remains more challenging due to their various natures and quantities. After a brief description of renewable and low-carbon methane production processes, the review focuses on the methods used for the analysis of the different compounds in renewable gases, from the main ones to impurities at ppbv levels. Gas chromatography (GC), coupled with different detectors, is the preferred technique, enabling the analysis and quantification of siloxanes, terpenes, oxygenates, and sulfur compounds. Recently, comprehensive two-dimensional GC has been applied to renewable gases, increasing the number of compounds detected. Non-chromatographic techniques are also reviewed. As sampling is of major importance in the search for reliable analyses, a whole section is devoted to this aspect. Among the available methods, pre-concentration on adsorbent tubes emerges as the most relevant solution.

The nature of carbon deposits and their formation pathways during catalytic supercritical water gasification of glycerol

Supercritical water gasification (SCWG) is a promising technology to convert wet biomass to renewable natural gas. The present study sheds light on the chemical composition and the formation mechanism of coke deposits on a Ru/CNF catalyst during continuous SCWG of glycerol in a fixed-bed reactor. SCWG experiments were performed using pristine carbon nanofibers (CNF) and 5 wt% Ru/CNF catalysts, which suffered from partial deactivation. Transmission electron microscopy (TEM) indicated a 34–42 % dispersion loss independently of the conditions, only partially explaining the activity loss observed during the test at very high space velocity. When operated under thermodynamic conditions, no deposits could be observed. A nanometric layer of deposits on the catalysts was present under intermediate conditions, while in the kinetic regime (conversion of glycerol down to 4 %), significant carbon deposition was observed. The chemical compositions of aqueous phases and organic deposits extracted from the catalysts and support showed that the presence of Ru enhanced the formation of unsaturated compounds from glycerol. In particular, molecules containing aromatic rings were detected. The space velocity significantly affected the composition of the coke deposits. The number of carbons in the molecules increased from 5–25 to 10–45 when moving away from the thermodynamic regime (full conversion), and the O/C ratio significantly decreased from 0.3–0.6 to 0.05–0.3, maintaining a very broad H/C ratio. The extracted organic deposits contained various aromatic compounds but were mostly represented by unsaturated aliphatic compounds. All these results were used to elucidate a reaction pathway for the formation of organic deposits from glycerol.

As2O3-poly(1H-pyrrole) nanocomposite for hydrogen generation from Red Sea water with high efficiencey

This research focuses on the synthesis of a new composite material, As2O3-poly(1H-pyrrole) (P1HP), for the generation of hydrogen gas. The novelty lies in the utilization of eco-friendly and cost-effective seawater as the source of hydrogen gas. The study aims to develop a sustainable and efficient approach for hydrogen production using this novel composite material and seawater as the raw materials. The As2O3/P1HP nanocomposite is synthesized through the polymerization of 1H-pyrrole. The crystal structure and size of the nanocomposite are determined using XRD analysis, which indicates a lattice constant of 11.06 Å and a crystallite size of 4.03 nm via the Scherer equation. The surface topography is visualized using SEM and TEM, revealing the presence of both large agglomerate particles and very small particles with a size of approximately 21 nm. The nanocomposite exhibits excellent optical absorption behavior and a small bandgap of 1.73 eV, making it suitable for hydrogen generation using Red Sea water as an electrolyte. The hydrogen production rate is measured to be 21 μmole cm−1.h, while the current density (Jph) values with and without incidence light are −0.24 and −0.05 mA.cm−2, respectively. The Jph values increase from −0.09 to −0.15 mA.cm−2 as the incidence photon wavelengths increase from 440 to 730 nm, indicating an enhancement in the rate of hydrogen generation. The use of low-cost materials and a natural source of electrolyte make this approach a promising candidate for renewable energy production and hydrogen gas generation.

Technical and market analysis of biomass gasification: Case study in Alentejo, Portugal

Alentejo is an extensive Portuguese region dominated by agroforestry and agro-industrial activities that generate significant amounts of biomass waste. These wastes are potential feedstocks that can be converted into new marketable products and therefore contribute to the development of new bioeconomy systems. Regionally, Alentejo has established innovation development policies that target sustainable technologies for waste valorization as one of the bioeconomy areas showing the greatest economic potential. Although these facts stimulate the motivation in developing a regional and more sustainable economy based on the use of energy sources with low carbon emissions, there is still a significant gap regarding technological know-how and attractiveness of technology investors and other stakeholders to the Alentejo region. This work focuses on gasification as one of the technologies to fulfill this competitive potential, in which local waste feedstocks can be processed into renewable biofuels providing answers to current decarbonization challenges and policies. In particular, the market and technology potential of gasification in Alentejo to position this technology in terms of the regional strategy for innovation and development is reviewed. The study revealed that Alentejo has the right spatial and market features for the development of a local bioeconomy based on gasification technologies both in terms of resources and market agents. However, different processes must be combined with gasification to convert the gas into the desired product, such as water-gas shift + pressure swing adsorption (for hydrogen production), methanation (for methane production), and Fischer-Tropsch synthesis (for aviation and diesel fuels production). Agricultural residues present the best potential for producing renewable gases and liquid fuels, with estimated amounts of 450 kt/year and 232 kt/year, respectively. Overall, Alentejo presents good conditions to be a regional lead market in terms of sustainable technologies, but the region should focus on establishing its competitive advantage in terms of regulation and technology development.

While some tout “renewable natural gas” as a way to mitigate climate change, others see a false solution

While some tout “renewable natural gas” as a way to mitigate climate change, others see a false solution

U.S. Re-entry into the 2015 Paris Climate Agreement and Implications for the EU, Korea, China, and Japan: A CGE Approach

Purpose - With renewed greenhouse gas (GHG) emissions, abatement commitments and the rejoining of the Paris Climate Agreement of 2015 by the U.S., this study assesses the impact of carbon dioxide (CO₂) emissions reduction, and the opportunity cost of the U.S. in implementing its nationally determined commitments (NDCs).
 Design/Methodology/Approach - The study employs the GTAP-E model, an extension of the static GTAP model with CO₂ emissions trading, and GTAP DB version 10A with a base year of 2014. Model implementation includes a baseline scenario that projects the global economy from 2014 to 2030, and four policy scenarios representing the implementation of U.S. NDC targets without and with emissions trading.
 Findings - Simulation results suggest that CO₂ emissions reduction with trading significantly lowers the emissions abatement cost compared to CO₂ emissions reduction with no trading. Furthermore, the study finds that CO₂ emissions reduction leads to a drop in industry output by all energy and most non-energy sectors. Simulation results illustrate that CO₂ emissions reduction by the U.S. significantly affects most of its trading partners’ real GDPs, welfare, export and import flows, and industry outputs.
 Research Implications - The study provides a comprehensive impact assessment of global CO₂ emissions reduction, including U.S. contributions to addressing climate change. Moreover, the study has quantified the opportunity cost the U.S. will likely pay for meeting its NDC targets, and the likely impact of CO₂ emissions reduction by the U.S. on its major trading partners, especially the EU, Korea, Japan, and China.

On transition to hydrogen metallurgy

The article shows that climate change is not only warming, but also extraordinary natural phenomena (droughts, floods, storms, tornadoes etc), which lead to significant economic damage. Climate warming is caused by increasing concentrations of greenhouse gases in the earth's atmosphere. The main task is to reduce carbon dioxide emissions. An analysis has been carried out of international documents such as the Kyoto Protocol, the Paris Climate Agreement, aimed at reducing greenhouse gas emissions into the atmosphere. It is shown that a significant amount of CO2 enters the atmosphere during the production of pig iron and steel, the data on the amount of carbon dioxide emissions from steel smelting in Ukraine and at «Azovsteel» iron and steel works have been provided. The article contains a critical analysis of the existing steel production technology, which is highly efficient but requires significant capital investment, fuel and energy resources, the source of which is the product of heat treatment of hard coal – coke, its carbon in the form of CO2 entering the atmosphere. Numerous proposed methods of steel production without the use of this coke are considered. One of the directions was the production of sponge iron without melting, another direction of coke-free metallurgy was high-temperature processes of obtaining liquid metal, that are carried out in one stage. The theoretically required amount of reducing agent at of iron with carbon monoxide and hydrogen has been determined. Methods of producing renewable gas by conversion of natural gas and gasification of coal are considered. The plans of the Metinvest Group management to develop a long-term technological strategy for metallurgical production taking into account environmental requirements are presented

Enabling hydrate-based methane storage under mild operating conditions by periodic mesoporous organosilica nanotubes

Biomethane is a renewable natural gas substitute produced from biogas. Storage of this sustainable energy vector in confined clathrate hydrates, encapsulated in the pores of a host material, is a highly promising avenue to improve storage capacity and energy efficiency. Herein, a new type of periodic mesoporous organosilica (PMO) nanotubes, referred to as hollow ring PMO (HR-PMO), capable of promoting methane clathrate hydrate formation under mild working conditions (273 K, 3.5 MPa) and at high water loading (5.1 g water/g HR-PMO) is reported. Gravimetric uptake measurements reveal a steep single-stepped isotherm and a noticeably high methane storage capacity (0.55 g methane/g HR-PMO; 0.11 g methane/g water at 3.5 MPa). The large working capacity throughout consecutive pressure-induced clathrate hydrate formation-dissociation cycles demonstrates the material’s excellent recyclability (97% preservation of capacity). Supported by ex situ cryo-electron tomography and x-ray diffraction, HR-PMO nanotubes are hypothesized to promote clathrate hydrate nucleation and growth by distribution and confinement of water in the mesopores of their outer wall, along the central channels of the nanotubes and on the external nanotube surface. These findings showcase the potential for application of organosilica materials with hierarchical and interconnected pore systems for pressure-based storage of biomethane in confined clathrate hydrates.

CLIMATE AND ENVIRONMENTAL BACKGROUNDS OF FUEL UTILIZATION, INFLUENCING UPON ALTERATION THE EUROPEAN AND UKRAINIAN TRENDS OF GAS SUPPLY P.1 PRESENT REQUIREMENTS TO SELECTION THE GAS FUELS. THERMODYNAMIC EVALUATION THE PRINCIPAL CHARACTERISTICS OF GAS FUEL

The work examines the starting points on the formation of fuel markets in Europe within the framework of the concept of sustainable development of the countries’ economics, taking into account the main limitations, primarily the climatic and environmental consequences of fuels combustion. This approach has led in the past years to simultaneous increase in absolute volumes’ consumption of mineral (organic, carbon-rich) fuel’s flow rate and to reduction of their shares in the overall fuel balance. The relevant changes had occurred because of simultaneous production and consumption the alternative fuels, including renewable gas and energy sources. New schemes, methods and ways of fuel supply have been analyzed, including maritime transportation of liquefied fuels (liquefied natural gas LNG, liquid hydrocarbons LPG, ammonia NH3) along with creation of a modern tanker fleet with floating and land-based regasification and gas storage (FSRU) systems; systems of interconnecting the pipelines for fuel supply, including hydrogen-enriched natural gas (HENG). According to the cultivated opinion, the global warming is considered as a consequence of the carbonization of environment due to emission of C-rich combustion products (CO2) into the atmosphere. The specified contribution of CO2 to atmospheric pollution is caused by the insufficient efficiency of fuel use, for example, in heating furnaces (up to 40 % of the total amount of fuel consumed in the industry is burned in furnaces). If the emissions value of a conventional natural gas combustion systems in furnaces meets the level of emissions up to 0.45 kg СО2/kW.h, then in the case of equipping the furnace with an efficient waste gas heat recovery system, the emissions are reducing to 0.2–0.25 kg СО2/kW.h, (Wunning J.). The determinant role of the efficiency of fuel use ηf has been correlated with the scale of atmospheric pollution with greenhouse gases (CO2) emission by means of thermodynamic analysis of energy efficiency. The efficiency of fuel utilization: by enthalpy ηH and by exergy ηeff — has been computed for the cases of burning the widespread fuels and the comparative analysis has been performed. The calculations of thermal energy characteristics of the fuels have been carried out by using the original author’s methodology based upon assumption of equilibrium thermodynamics for the cases of using the widespread gas fuels within the temperature range T from the standard T0 to the theoretical combustion temperature TT. In accordance with original author’s method the most important heat engineering characteristics of the fuels have been studied by means of approaches of equilibrium thermodynamics. Higher and lower combustion heat, higher and lower Wobbe numbers, theoretical (adiabatic) combustion temperature of the widespread fuels have been determined. An influence of hydrogen content in CH4/H2 gas fuel mixtures on the mentioned properties has been determined. From the list of firing engineering characteristics, the formation of the methane number MN for different organic and alternative fuels have been considered. The accumulated numerical values of MN for the widespread types of fuels have been stated and compared. Bibl. 38, Fig. 4, Tab. 1.

Harvested winter rye energy cover crop: multiple benefits for North Central US

Cover crops (CCs) can reduce nitrogen (N) loss to subsurface drainage and can be reimagined as bioenergy crops for renewable natural gas production and carbon (C) benefits (fossil fuel substitution and C storage). Little information is available on the large-scale adoption of winter rye for these purposes. To investigate the impacts in the North Central US, we used the Root Zone Water Quality Model to simulate corn-soybean rotations with and without winter rye across 40 sites. The simulations were interpolated across a five-state area (IA, IL, IN, MN, and OH) with counties in the Mississippi River basin, which consists of ∼8 million ha with potential for rye CCs on artificially drained corn-soybean fields (more than 63 million ha total). Harvesting fertilized rye CCs before soybean planting in this area can reduce N loads to the Gulf of Mexico by 27% relative to no CCs, and provide 18 million Mg yr−1 of biomass-equivalent to 0.21 EJ yr−1 of biogas energy content or 3.5 times the 2022 US cellulosic biofuel production. Capturing the CO2 in biogas from digesting rye in the region and sequestering it in underground geologic reservoirs could mitigate 7.5 million Mg CO2 yr−1. Nine clusters of counties (hotspots) were identified as an example of implementing rye as an energy CC on an industrial scale where 400 Gg yr−1 of rye could be sourced within a 121 km radius. Hotspots consisted of roughly 20% of the region’s area and could provide ∼50% of both the N loss reduction and rye biomass. These results suggest that large-scale energy CC adoption would substantially contribute to the goals of reducing N loads to the Gulf of Mexico, increasing bioenergy production, and providing C benefits.

Enabling the injection of hydrogen in high-pressure gas grids: Investigation of the impact on materials and equipment

Green hydrogen is a renewable gas that can help to reach the goal of decarbonizing the energy sector. The use of the natural gas grid for seasonal storage and transport of hydrogen needs previous assessment of its tolerance, ensuring safe and viable operation. In this work, the tolerance of the most typical material pipelines and key elements of high-pressure gas grids to the transport of 20 mol% hydrogen blends at 80 barg has been investigated at pilot scale. For this, the experimental campaign carried out at a testing platform replicating a high-pressure gas grid lasted 3000 h. The tightness of different kind of valves led to hydrogen losses below 1 Nml·h−1. No embrittlement or other kind of damage was found on these valves or the different parts of the equipment (regulator, flowmeter) tested. C-ring, 4pb and CT-WOL specimens have been prepared from carbon steel pipes (API5L Gr X42 to X70), showing no damage after exposure to hydrogen. H2/CH4 deblending has also been successfully achieved using Pd-based membrane technology, obtaining a high-purity separated streams.

Post-hydrolysis versus side-stream ammonia stripping in semi-continuous two-stage anaerobic digestion of high nitrogen feedstock

With the increased popularity of two-stage anaerobic digesters, post-hydrolysis ammonia stripping (PHAS) has resurfaced as a new possible treatment configuration. This study discusses for the first time the semi-continuous operation of PHAS and compares it with the most used stripping configuration nowadays, side-stream ammonia stripping (SSAS), under similar conditions using air or renewable natural gas (RNG) as stripping mediums. Ammonia stripping operating conditions were set to pH 9.5, 55 °C, and flowrate of 100 L gas/L/hour. RNG removed 50–58% of ammonia while air removed 70–78%. Interestingly, the PHAS system showed more flexibility and resilience than the SSAS system when testing parameters were changed. Volumetric and specific biogas production from PHAS and SSAS scenarios averaged up to 1.91 and 1.26 L/L/day and 831 and 701 L biogas/ kg VS/day under organic loading rates of 2.61 and 1.8 g VS/L/day, respectively.

Understanding RNG Gas Quality through Execution at Newtown Creek WRRF RNG

With each passing year a new record for global emissions is set (1) and policymakers and utility companies must embrace all avenues for decarbonization of energy. Universal adoption of electrification for every building and home by 2050 (2) is not practical, a balance must be struck between an equitable transition to cleaner energy supplies and ensuring uninterrupted, safe delivery of energy to utility customers. Renewable Natual Gas (RNG) is a molecule-for-molecule replacement of traditional geological natural gas with tangible life cycle emissions reductions. California continues to lead the way, initially starting with the low carbon fuel standard (LCFS) which aimed to reduce the carbon intensity of transportation fuel, and subsequently, Senate Bill 1440, which established RNG procurement goals including 12% RNG by 2030 (3). Other States are starting to adopt similar changes such as Oregon’s Senate Bill 98 and Colorado’s Senate Bill 21-264. As utilities attempt to transition the energy network, they must never compromise system safety and reliability. Recognizing that raw biogas has dangerous levels of contaminants of concern (COC) and must be conditioned to pipeline quality, its important utility companies better understand the methods with which methane is extracted and the testing protocols used to confirm performance. This paper highlights the equipment, processes, and testing regime National Grid and its partner the New York City Department of Environmental Protection (NYC DEP) deployed as part of its Newtown Creek RNG project, which successfully began injecting RNG into the NYC gas distribution network in October 2022.

Innovation for renewable energy and energy related greenhouse gases: Evaluating the role of green finance

Environmental degradation is one of the many unintended consequences of industrialization, which has resulted in misery for humans, and biodiversity around the world. These environmental concerns require consideration in order to gain a better understanding of how to design policy around climate change. In this regard, a number of deals have been reached with the objective of reducing pollutants in the environment so as to keep an average temperature that below 2 degrees Celsius. In order to effectively reduce greenhouse gas emissions, nations all over the world have been putting more of their attention on investments in R&D for renewable energy, often known as green financing. This study explores the influence of green finance in the presence of GDP, human capital, and economic risk on GHG emissions in G7 countries for the period of 1990–2020. We find that green finance and economic risk abates GHG emission intensity. It is interesting that the impact of green finance is stronger for countries with high emissions level and lower for low emitter countries. Human capital and GDP increase GHG emissions. The results of the present study have important consequence for G7 nations because majority of these countries have been facing high oil demand. Policies to enhance green financing during the period of high energy demand are vital. It is imperative that policies be put in place to maintain the development in green financing.

Development Progress of a 70% Efficient Hybrid SOFC-I.C. Engine Hybrid System for Stationary Applications up to 1 MW

Flexible and dispatchable, high-efficiency power generation supplied with carbon-neutral renewable fuels is needed to help enable defossilization of the electric grid. Pressurized, hybrid SOFC systems fueled with hydrogen, biogas, or renewable natural gas can generate clean power at ultra-high efficiency. In this summary, we provide an update on the development progress of a full-scale, hybrid system that targets low cost (<1000 $/kW) and ultra-high efficiency (70%-LHV) distributed power generation for applications up to 1 MW. The system features pressurized, metal-supported SOFC technology from Ceres Power which is integrated with a modified diesel engine which converts the residual chemical exergy in the anode tail-gas from the SOFC to drive auxiliaries and produce net additional power. Updates on critical hardware advancements around pressurized multi-stack, 30 kW fuel cell modules, low-speed high efficiency rotating equipment, and ultra-high efficiency power electronics are provided. A techno-economic outlook for such power generation systems in various stationary applications.

Egypt’s energy balance map: a geographical perspective

ABSTRACT This study aims to determine Egypt’s potential for energy sources, and the volume of potential energy production and consumption, balancing inputs, outputs and availability of energy. The study depends on analyzing the map of Egypt’s energy balance of non-renewable and renewable energy, including oil, gas, solar, and wind energy, using UN-Energy Balance of Egypt data and the global solar and wind atlases of Egypt. It demonstrates that in 2020 Egypt’s production of fossil fuels is 89.03% of the total energy production, while renewable energy production is only 10.97%. More specifically, fossil fuel consumption is 97.8% of the total consumed energy, while energy consumption from renewable sources is 2.2%. Therefore, this study recommends that further studies should be conducted to explore ‘hybrid’ energy sources to solve Egypt’s energy crisis and to preserve the environment through clean energy sources, such as using green hydrogen and working on reducing emissions from fossil fuels. It is also recommended that there is value in employing GIS and RS applications to estimate the potential of renewable energy across the map of Egypt, and to present this information to possible investors who could expand the development of clean energy sources.

Environmental life cycle assessment of treatment and management strategies for food waste and sewage sludge

A consequential life cycle assessment (LCA) was utilized to compare the environmental impacts of food waste and sewage sludge management strategies. The strategies included a novel two-phase anaerobic digestion (AD) system and alternatives including landfill, waste-to-energy, composting, anaerobic membrane bioreactor, and conventional AD (wet continuous stirred-tank reactor [CSTR]). The co-management of food waste with sewage sludge was also considered for the two-phase AD system and for a conventional AD reactor. A multidimensional LCA approach was taken, considering the five-midpoint impact categories of global warming, smog, human health particulate, acidification, and eutrophication estimated using the U.S. EPA Tool for the Reduction and Assessment of Chemical and Other Environmental Impacts. Co-management of food waste and sewage sludge using the novel two-phase AD system was shown to maximize energy recovery and had a net global warming benefit while reducing other environmental impacts compared with the alternative management strategies. It had similar relative environmental advantages across all categories as conventional AD, with the advantage of a smaller physical footprint. However, both approaches featured net environmental burdens when the background electric grid intensity fell below 0.25 kg CO2-eq kWh−1, as could be expected in a decarbonized electric future. Upgrading the biogas produced from AD to renewable natural gas can displace the use of fossil natural gas for other non-electricity energy requirements that are difficult to decarbonize and may extend the time period of significant environmental benefits of utilizing AD for organic waste management. Treatment of the nutrient-rich supernatant generated by the novel two-phase AD system could be an obstacle for utilities with stringent nutrient discharge limits. Future research and full-scale implementation are needed to demonstrate the benefits of the two-phase AD system predicted through this analysis.