Improving Biogas Production in Tapioca Industry by Using Onggok as Co-substrate

Udin Hasanudin, Nadia Dwi Safira, Fibra Nurainy, Tanto Pratondo Utomo, Agus Haryanto

Abstract


Onggok or cassava pulp can be explored as a co-substrate for biogas production in a tapioca industry. But, its complex nature needs pretreatment to improve its digestibility, such as delaying time to facilitate hydrolysis-acidogenesis step. The purpose of this study was to determine the best delaying time for hydrolysis-acidogenesis step of onggok-wastewater mixture. The experiment was conducted using a batch reactor with active volume of 1000 mL. Substrate mixture of onggok 10% (w/w) in tapioca wastewater was added with digester sludge as bacteria source at a ratio of 1:4 (substrate mixture : sludge). The delaying time for the hydrolysis-acidogenesis stage was varied from 0 (A), 3 (B), 4 (C), and 5 days (D). For comparison, a control treatment (K) using only tapioca wastewater and sludge was also performed. Biogas production was carried out in duplicate for 20 days. The results showed that biogas production increased by 73.01%, 61.29%, 66.10%, and 46.44% in samples A, B, C, and D, while total methane increased by 67.42%, 58.73%, 68.83%, and 48.01% as compared to control. Treatment C (4 d delaying time) was found as the best, with an increasing biogas production of 66.10%, and total methane yield of 68.83%, and average methane content of 57.58%.


Keywords


cassava pulp; hydrolysis; methane yield; renewable energy; sustainable

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DOI (PDF): https://doi.org/10.20508/ijrer.v13i2.13814.g8748

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