Up-grading of landfill gas for lowering co2 emissions

Abstract

Consulta en la Biblioteca ETSI Industriales (8582)

[EN] The main objective of this thesis is the up-grading of landfill gas, reducing environmental problems with reference to reduction of greenhouse gases emissions from the waste management sector, and renewable energies to energy recovery from biowaste. Concretely, reducing CO2 emissions is achieved through a process of CO2 capture and storage. Although CO2 contained in landfill gas does not effectively contribute to the Green House effect balance, an additional subtraction or negative CO2 emissions from the atmosphere is possible to obtain. Moreover, the use of landfill gas, composed mainly by methane and CO2, as substitute of natural gas is possible. To carry out the CO2 capture and storage, a stage of absorption of CO2 contained in the landfill gas is necessary using with a potassium hydroxide solution. After, the process needs a stage of precipitation resulting from the contact between the solution of potassium carbonate with a solution of calcium hydroxide, obtaining calcium carbonate precipitated and regenerating the solution of potassium hydroxide used initially. Using potassium hydroxide regenerated and industrial waste as a source of calcium hydroxide, the CO2 initially in a gas stream is captured in a solid phase and the re-use of the solution of potassium hydroxide allows reducing operating costs. This thesis is focussing in the stage of precipitation. Therefore, content of calcium carbonate in solid phase and percent of potassium hydroxide regenerated will be the key to control the precipitation.