Fast Startup of Semi-Pilot-Scale Anaerobic Digestion of Food Waste Acid Hydrolysate for Biogas Production

Abstract

In this study, a fast startup of semi-pilot-scale anaerobic digestion of food waste acid hydrolysate for biogas production was carried out for the first time. During the period of fast startup, more than 85% of chemical oxygen demand (COD) can be degraded, and even more than 90% of COD can be degraded during the later stage of anaerobic digestion. During this anaerobic digestion process, the biogas yield, the methane yield, and the CH content in biogas were 0.542 ± 0.056 m/kg, 0.442 ± 0.053 m/kg, and 81.52 ± 3.05%, respectively, and these values were high and stable. Besides, the fermentation pH was very stable, in which no acidification was observed during the anaerobic digestion process (outlet pH was 7.26 ± 0.05 for the whole anaerobic digestion). Overall, the startup of this anaerobic digestion can be completed in a short period (the system can be stable 2 days after the substrate was pumped into the bioreactor), and anaerobic digestion of food waste acid hydrolysate is feasible and attractive for industrial treatment of food waste and biogas production.

Pilot-scale Anaerobic Digestion of Food Waste: Evaluation on the Stability, Methane Production, and Kinetic Analysis

“…Methane gas production begins on day 1 according to the statistics shown. The methane gases start to produce on day 1 similar with what reported by Huang et al, [55] and Li et al, [51]. For this study, the methane production increase from day 1 until day 10 and then the methane production slowly decreases until day 26.…”

Effects of operating conditions on biogas production in an anaerobic digestion system of the food and beverage industry

“…The yields and compositions of gases during the experiments were monitored with a bubble respirometer and using gas chromatographic analysis. The pH levels of the reaction vessels were controlled at 7.5 when initiating each reaction 20 …”

Deep Eutectic Solvents for Pretreatment, Extraction, and Catalysis of Biomass and Food Waste

“…The manufacturing, agricultural, and food industries harvest large amounts of residues each year, but these are simply discarded as biowaste. These residues contain carbohydrates (cellulose, starch, and sugars), lignin, lipids, proteins, and oils [42,43,48,57,58,59,60,61,62]. There is a growing awareness that the problematic challenges of waste management, resource depletion, and the loss of valuable and energy-containing waste can all be solved; more efficient use of biowaste will contribute to sustainable development.…”