Abstract
Biogas will be produced from a single organic substrate and controlled the ratio of carbon nitrogen by added inorganic nitrogen substances. The study has been tried to combine substrates from industrial tapioca industrial wastewater with tofu industrial wastewater. The experiments were carried out in batch anaerobic digesters with a C/N ratio range of 20 - 30 and variation of microbial sludge from cow rumen, anaerobic sludge of tofu wastewater treatment plant (WWTP) and anaerobic sludge of tapioca WWTP. The ratio of C/N in the range of 20-30 didn’t significant effect on the volume of biogas production. The microbial from cow rumen gives the best biogas production performance. Biogas yield is 2,199 liter per kg COD.
Highlights
Biogas can be produced by the decomposition of one types of substrate organic, but we need chemicals such as Urea, NPK. or nitrate salts for control C/N ratio
Co-digestion is an anaerobic processing of mixtures of two or more different organic substrates with the aim of increasing the efficiency of the digestation process [2]
Fettig (2013) in tapioca industrial liquid waste containing an organic substrate expressed as COD of 20.640 mgO2/l [9], containing carbohydrate 25.37 gr in 100 g tapioca liquid waste, carbohydrates in tapioca industrial liquid waste is 25.37 gr in 100 gr of tapioca liquid waste [10]
Summary
Biogas can be produced by the decomposition of one types of substrate organic, but we need chemicals such as Urea, NPK. or nitrate salts for control C/N ratio. Biogas can be produced by the decomposition of one types of substrate organic, but we need chemicals such as Urea, NPK. Given the variation of the elemental content present in various substrates or wastes, it is possible to mix two or more types of waste as biogas substrate as well as regulate the composition of its elements. The combination of different types of substrates or wastes to be converted into biogas is known as co-digestion [1]. In tapioca industry liquid waste has an organic content rich in carbon. The waste contains 0.46% nitrogen and 39.58% carbon, with a C/N ratio of about 86: 1. Nitrogen content in this tofu waste can be utilized and combined with tapioca industrial waste to make biogas for C/N ratio is optimal, so it can increase biogas production
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