Abstract

Suripto Dwi Yuwono¹, Sutopo Hadi¹* and Takao Kokugan²

Onggok (dried cassava bagasse), is the by-product of the tapioca industry. It is mostly treated as industrial waste and has low commercial value. This research aims to utilize onggok as the substrate in the production of lactic acid in Tofu Liquid Waste (TLW) medium by Streptococcus bovis JM5802. The fermentation process is carried out in anaerobic conditions at pH 5.5 and temperature 39°C. The results of the fermentation using TLW media reached a productivity of 0.55 g/L.h. To increase its nutrient content, the media is then added with concentrate maguro waste (CMW) with concentrations of 10, 20, 30 and 40 g/L. The addition of CMW enhanced the production of lactic acid, maximum productivity of 5.18 g/L.s is reached at the addition of 30 g/L MWC.

Onggok; Lactic acid; Tofu liquid waste; Streptococcus bovis

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