Feasibility study of production of Bio methane from biodegradable waste in Rwanda. Case study: NDUBA Landfill site

Abstract

Wastes (Biodegradable and Non- Biodegradable) generation is increasing rapidly in these days as result of expansion of economic activities and rapid growth of population in Rwanda, particularly in city areas. The wastes generated mainly contain biodegradable materials which are good indicator for producing Biogas and this biogas can generate Biomethane once biogas is upgraded. This thesis is intended to evaluate the feasibility of biomethane production in Rwanda especially in Kigali city where there is large amount of wastes generation. During this thesis a case study of Nduba Landfill site in Kigali City was studied, Data about Wastes (Biodegradable and Non- Biodegradable) generation were collected. During data collection, Observation and interviews were used for primary data. Data gathered from workers of Nduba dumpsites, Staff of different company, other sources. The effect of substrate on biogas yield was studied by using Biodegradable waste in laboratory scale experiment using water displacement method to monitor the volume of biogas produced. The biogas produced by Biodegradable waste was monitored and recorded over a period from 8th October to 8th November 2021 which is equal to 30 days. The results show that 100 g of Biodegradable waste with 100 ml of water and 5g of cow dung as inoculum, from 30th day Biodegradable waste produce 20 ml of Biogas. So, 100 g of Biodegradable waste produce 20 ml of Biogas which means 1 kg produce 200 ml which is equal to 0.0002 m3. Conferring to the results of the study, it was found that as Organic waste generation increase and also Biogas production is increased which in turn increase Methane and Biomethane generated. This study show that Biogas, Methane and BioMethane production increase as the Years increase and on graph which combine Biogas, Methane and BioMethane, graph line of Biogas is higher than graph line of Methane and BioMethane because volume of Biogas is higher compared to volume of Methane and BioMethane. The study concludes that once Bio Methane increase as organic Biodegradable Waste increase, as Biodegradable Waste increases also Biogas which in turn increases Bio Methane produced. Therefore, the Bio Methane Production from Biodegradable Waste in Rwanda is Feasible