Abstract
Conventional anaerobic digester such as fixed dome and floating drum are found having drawback in application in developing country. It was difficult in maintenance and operation. It was also difficult to relocate to the new site of waste processing. The portable anaerobic digester is prepared in this work as a solution. The capacity is about 500 liter so that suitable for home scale organic waste treatment. The material that is used for the digester was 304 stainless steel. The digester is completed wit agitator to optimize the biogas production. A slurry of cow dung (50% cow dung+ 50% water) is use to feed the digester. There are 2 variations of slurry loading rate that were investigated in this work, namely 5 liter slurry/day and 10 liter slurry/day. The biogas production rate is found about 51.7 liter biogas/day if loading with 5 liter slurry/ day. The biogas production rate is found increase significantly to become 82 liter biogas/day if loading with 10 liter slurry/day. The quality of biogas is found better with loading rate 5 liter slurry/day which has average CH4 content about 58.75% vol. comparing the one with loading rate 10liter slurry/day that have average CH4 content about 56.40% vol.
Highlights
In many countries biogas technology spread has foundered and/or up to 50% of plants are non-functional
The biogas production rate from both loading rate are found linear in the range of 30 days (1 month) of biogas production
From this point it is clear that loading rate influent the biogas production rate in the continuous system of 500 liter anaerobic digestion
Summary
In many countries biogas technology spread has foundered and/or up to 50% of plants are non-functional. This is linked to inadequate emphasis on maintenance and repair of existing facilities. The disadvantages of low-rate digesters biogas technology such as fixed dome and floating drum are : requires reliable feed source, high construction costs relative to income of users, laborious operation and maintenance, limited lifespan, requires reliable feed source, construction costly[2]. Certain researcher develop small size anaerobic digester but nor for the purpose of portable design [3]. More studies are required to find optimal biogas models to the real situation Such future biogas plant models should take 3 requirements: simple in construction, operation, and maintenance [6]. The effect of loading rate to the biogas production rate as wellas biogas composition will be investigated
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