ABSTRACT

Kitchen waste is an important part of municipal solid wastes in large cities. These kitchen wastes are mainly biodegradable products and can be a good source for anaerobic fermentation. Millions of tons of kitchen waste being produced every year which have to be safely disposed without any negative impact on the environment. Anaerobic digestion as a pre-treatment prior to landfill disposal or composting  offers several advantages, such as minimization of masses and volume, inactivation of biological and biochemical processes in order to avoid  landfill gas and odour emissions, reduction of landfill  settlements and energy production in the form of methane. Therefore, anaerobic digestion of bio-degradable kitchen waste can be considered an alternative option to improve the environment condition caused by organic solid wastes/ kitchen wastes and at the same time taking an advantage as an environmentally friendly resource of energy.

In this thesis work, a 0.34m³ portable biogas digester was designed and also fabricated based on feeding rate of the kitchen waste such as potatoes waste and onions waste. According to the design, 45.85L biogas can be obtained theoretically but in practice 35.69L was obtained. The digester was fabricated portable because in urban area, people have not enough space for making underground biogas digester. In urban area, people have enough space on the roof, so they can easily keep the portable biogas digester on the roof and also use their kitchen waste to get biogas as a cooking fuel and fertilizers etc.