Studies On Biogas From Kitchen Wastes Production Scrubbing And Analysis

Abstract

Municipal wastes, animal wastes, agricultural wastes and kitchen wastes are generated newlinecontinuously, which are becoming social and environmental concern due to the large impacts of newlineimproper treatment and management. It is therefore required to decompose the organic wastes to newlineproduce biogas. Anaerobic digestion (AD) is one of the processes to decompose these organic newlinewastes into biogas. In this process microbial decomposition of organic wastes occurs in absence newlineof oxygen and presence of the hydrogen gas. Biogas mainly consists of methane (CH4), carbon newlinedioxide (CO2) and hydrogen sulphide (H2S). Besides biogas, AD produces solid and liquid newlineresidue called digestate which can be used as organic manure to fertilise land. Biogas produced newlinefrom anaerobic digestion is required to be upgraded through scrubbing by removing CO2 and newlineH2S, which can be used as cooking fuel and an alternative fuel to I.C. engines. There are also newlineemissions of carbon dioxide (CO2), hydrocarbon (HC), nitrous oxide (NOx) and carbon monoxide newline(CO) in I.C. engines due to use of fossil fuels. Therefore it is necessity to use the renewable fuels newlineto solve the emission problems. It is also required to find alternative fuels which will reduce newlineharmful exhaust emissions and to maintain high thermal efficiency. Biogas is one such fuel, newlinewhich can be adapted for use in internal combustion (I.C.) engines. I.C. Engines are generally newlineused for power generation and diesel engines have important contribution to it. Due to the low newlinecetane numbers and high ignition temperatures, biogas cannot be used alone as a fuel for newlinecompression ignition (C.I.) engines. Hence, the dual fuel mode approach for C.I. engines is the newlineappropriate method of utilizing gaseous fuels. During the dual fuel mode of operation, air and newlinebiogas mixture is aspirated and compressed like the traditional diesel engine. The compressed newlinemixture is ignited by the diesel fuel injection at the end of compression stroke. A diesel engine newlinecan be converted to a dual fuel engine with minimum modification at the air inl