Optimization of conditions for Biomethane production through anaerobic digestion of domestic fruit waste

Abstract

An energy crisis is main issue of Pakistan and spending larger amount of foreign exchange for import of fuels. Main source of energy in Pakistan is fossil fuels but these sources are non renewable. Therefore to fulfill energy demand alternative energy sources like renewable source are best choice. The present study was conducted for biomethane production by using different concentration of fruit waste along animal manure at various pH (6-8.5) and temperature like (33-37C) respectively using anaerobic digestion. Biochemical analysis of fruits waste was determined and results revealed that fruit waste is a best option for biofuel production. This study was conducted at mesophilic temperature range and 35C is considered to be best temperature. PH range also effect the biomethane production and best production is at 8 pH. Retention time and concentration of manure and waste also effect the biomethane production. Biomethane production was also effected in presence of different heavy metals. Iron, magnesium, calcium, sodium and nickel were present about 7.1ppm, 12ppm, 2.6ppm, 7.8ppm and 1.9ppm respectively. Maximum Biomethane produced through this study was 15.25l/ kg/day at 35C and pH 8. Biogas produced was filtered by mixing solution of calcium hydroxide. Biomethane production was confirmed through flame test. Flame produced was blue and violet in color. Biomethane produced used for cooking purpose. It is considered to be safe and economic method for energy production.