Development of portable biodigester for household biogas production

Mohamed Zaki, Muhammad Badrul Amin (2020) Development of portable biodigester for household biogas production. [Project Paper] (Submitted)

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Abstract

Biodigester is a structure called bioreactor or anaerobic reactor which provides the reaction of microbial digestion and fermentation into biogas under anaerobic condition. It is a system that helps in optimizing the biogas production from food waste for a low-cost renewable energy. Basically, it takes influent feed such as food waste and produce methane rich biogas and nitrogen rich fertilizer as effluent. In fact, the digestion and fermentation time is depending on the type of feed input and the condition parameters of bacteria used. The design of portable household biodigester should meet the required specifications which include the absence of water or gas leakages, high corrosion resistance, low cost and af[ordable, easy to be mafiage) simple maintenance and accessible to both small and large scale production. Portable biodigester for household use was invented as a system to converting food waste into biogas as the main product and effluent liquid as the second product. The system comprises of a tank divided into two compartment as the main component for anaerobic digestion. The biogas produce is store at the upper part of the tank with extended storage create by a floating lid that can move up and down based on amount ofbiogas available and the biogas can be discharge through a biogas port at the top of the floating lid. A water-jacketed is designed at the outer part of the tank to create a brier to the biogas from release out and complete the float mechanism of floating lid. The system also equipped by apair of impellers that connected to the floating lid by a rod and a nut which can increase the production rate of biogas. The impeller rod is guide by a plate to avoid it from tilting. The influent port is connected to the bottom of main part which is work as a feeding port to the system while for the effluent port, it is connected into the second part of the tank with design of S-shape to avoid the biogas produce from release out through the effluent port. The system is placed above a stand support that comprise of 4 castor wheel to help in portability of the system. The performance of the portable biodigester is tested to observe the efficiency of mixing process inside a portable biodigester. The performance test done by run the portable biodigester for 10 days with mixing process by a pair of impeller and mix the food waste sample inside the portable biodigester 2 minutes per day for 10 days. The test was continued by another 10 days without mixing to observe the performance. The biogas produce each day was recorded by a wet gas meter. As results, the biogas produce during mixing process is 45oh higher compare to biogas produce when nonmixing. Total solid content and chemical oxygen demand of food waste and effluent sample was analyse to observe the anaerobic digestion efficiency inside the portable biodigester. The total solid removal during mixing process was 94% compare to during without mixing 96%.The COD removal during mixing was 9l% compare to without mixing which is 95%.

Item Type:	Project Paper
Subjects:	T Technology > TP Chemical technology
Faculty:	Faculty of Engineering
Depositing User:	Ms. AZLINA ZAINAL ABIDIN
Date Deposited:	03 Nov 2025 06:04
Last Modified:	26 Nov 2025 08:15
URI:	http://psaspb.upm.edu.my/id/eprint/2584

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