Open AccessOptimization of hydrolysis and acidogenesis of food waste for production of organic acid
Author(s) -
Muhammad Azmeer Asyraf Zulkifli,
Mei Yin Ong,
Saifuddin Nomanbhay,
Abd Halim Shamsuddin
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/476/1/012140
Subject(s) - acidogenesis , food waste , anaerobic digestion , hydrolysis , biogas , anaerobic exercise , chemistry , food science , waste management , pulp and paper industry , lactic acid , methane , population , waste treatment , organic chemistry , bacteria , biology , engineering , physiology , genetics , demography , sociology
The rising of human population in the world leads to the increasing number of food waste annually. To counter this problem, the food waste is suggested to be recycled into value-added product. Anaerobic digestion is one of the ways to recycle the food waste. The main product of a complete anaerobic digestion is methane (biogas). However, methane is very hard to handle since it is in gas form. Hence, this paper has drawn the attention toward the intermediate product of anaerobic digestion, the lactic acid. This paper presents the effect of 3 different variables: (a) pH values, (b) temperature and (c) amount of inoculum, on the hydrolysis and acidogenesis stages of anaerobic digestion of food waste. Besides, the optimal condition was determined. Experimental results show that the optimum, 0.0845 g/mL of lactic acid was obtained at pH value of 7, with 125 g of volatile solid food waste and 100 g of inoculum (Ragi Tapai), and was left in a pre-heated oven at 45°C for four days. This value was higher than the other previous study, and so showing promise in producing green acid from food waste that can be used as an intermediate substance for making other materials.