Title:
Anaerobic Digestion of Pretreated Food Waste and Bone Meal
Author(s):
Bedoić, R., Špehar, A., Cuček, L., Cosić, B., Pukšec, T., Duić, N.
Document(s):
Paper
Poster
Abstract:
This study aims to demonstrate the use of mechanically-ground biodegradable material, food waste and bone meal as the substrates in anaerobic digestion. The effect of adding bone meal to food waste has been investigated by splitting-up the process in two stages. First, the thermal pretreatment of food waste and food waste-bone meal mixture has been performed at the temperature of 35 °C for 5 days. Adding the bone meal to food waste in a share of 5 % on a dry basis for thermal pretreatment has increased chemical oxygen demand and nitrogen ammonia concentration, in comparison to food waste, by 37% and 41 %, respectively. Pretreated biomass has been further utilised to produce biogas in a lab-scale batch mesophilic process at the temperature of 40.5 °C. The mass ratio of the feedstock to inoculum in reactors was set on 1:1, on a dry basis. Biochemical biogas potential of thermally pretreated food waste has been reported to be 0.569 Nm3 per kg of total solids, while the bone meal-food waste mixture has shown the production of 0.503 Nm3 of biogas per kg of total solids. Adding bone meal to food waste in 5 % mass share for anaerobic digestion has shown antagonistic effects that reflected in 12 % lower production of biogas. However, bone meal-food waste mixture has shown the lower presence of hydrogen sulphide in biogas, for which the highest reported value was 5,653 ppm, while food waste has shown the highest presence of hydrogen sulphide in biogas of 6,917 ppm. The methane yield profiles during anaerobic digestion in both cases have shown to be very similar. The highest reported value for methane share in biogas has been 68.88 % for bone meal-food waste mixture, while the highest methane share in biogas from food waste has been 67.65 %. Results of this research indicate that bone meal can be successfully utilised as a co-substrate in anaerobic digestion of food waste with a primary aim to decrease the production of hydrogen sulphide.
Keywords:
anaerobic digestion, food waste, hydrogen sulphide, bone meal
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Anaerobic digestion for biogas and biomethane production
Event:
27th European Biomass Conference and Exhibition
Session:
2CV.6.23
Pages:
946 - 950
ISBN:
978-88-89407-19-6
Paper DOI:
10.5071/27thEUBCE2019-2CV.6.23
Price:
FREE
