Abstract
Biogas production from organic waste could be an option to reduce landfill and pollutant emissions into air, water, and soil. These fuels contain several trace compounds that are crucial for highly efficient energy generators or gas injection into the grid. The ability of adsorbents to physically remove such adsorbates was investigated using adsorption isotherms at a constant temperature. We experimentally modelled isotherms for siloxane removal. Siloxanes were considered due to their high impact on energy generators performance even at low concentrations. Octamethylcyclotetrasiloxane was selected as a model compound and was tested using commercially available carbon and char derived from waste materials. The results show that recyclable material can be used in an energy production site and that char must be activated to improve its removal performance. The adsorption capacity is a function of specific surface area and porous volume rather than the elemental composition. The most common adsorption isotherms were employed to find the most appropriate isotherm to estimate the adsorption capacity and to compare the sorbents. The Dubinin-Radushkevich isotherm coupled with the Langmuir isotherm was found to be the best for estimating the adsorption capacity.
Highlights
Biogas production from organic waste could be an option to reduce landfill and emissions into the air, water, and soil
Adsorption Capacity Related to Physical Sorbent Characteristics
We experimentally modelled adsorption isotherms for siloxane removal using commercial and waste-derived materials
Summary
Biogas production from organic waste could be an option to reduce landfill and emissions into the air, water, and soil. Sulphur and siloxane play an important role in the energy production sector and in injection into gas networks. Biomethane injection into the gas network requires stringent trace compounds limits, fixed by the European authorities SOFCs are systems with high electrical efficiency with stable behavior at partial load, low noise, and low pollutant emissions [3]. These systems have a stricter limit for trace compounds, especially for sulphur and siloxane compounds, compared with traditional generators due to catalyst deactivation [4,5,6,7,8]
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