Liotta Flavia, d'Antonio Giuseppe, Esposito Giovanni, Fabbricino Massimiliano, van Hullebusch Eric D, Lens Piet N L, Pirozzi Francesco, Pontoni Ludovico
Department of Civil and Mechanical Engineering, University of Cassino and the Southern Lazio, Cassino, Italy
Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, Naples, Italy.
Waste Manag Res. 2014 Oct;32(10):947-53. doi: 10.1177/0734242X14550740. Epub 2014 Oct 3.
This work investigates the role of the moisture content on anaerobic digestion of food waste, as representative of rapidly biodegradable substrates, analysing the role of volatile fatty acid production on process kinetics. A range of total solids from 4.5% to 19.2% is considered in order to compare methane yields and kinetics of reactors operated under wet to dry conditions. The experimental results show a reduction of the specific final methane yield of 4.3% and 40.8% in semi-dry and dry conditions compared with wet conditions. A decreasing trend of the specific initial methane production rate is observed when increasing the total solids concentration. Because of lack of water, volatile fatty acids accumulation occurs during the first step of the process at semi-dry and dry conditions, which is considered to be responsible for the reduction of process kinetic rates. The total volatile fatty acids concentration and speciation are proposed as indicators of process development at different total solids content.
本研究以易快速生物降解的底物——食物垃圾为代表，探讨了水分含量对其厌氧消化的作用，并分析了挥发性脂肪酸产生对过程动力学的作用。考虑了4.5%至19.2%的一系列总固体含量，以比较在湿态至干态条件下运行的反应器的甲烷产量和动力学。实验结果表明，与湿态条件相比，半干态和干态条件下的比最终甲烷产量分别降低了4.3%和40.8%。当总固体浓度增加时，比初始甲烷产生速率呈现下降趋势。由于缺水，在半干态和干态条件下过程的第一步会出现挥发性脂肪酸积累，这被认为是过程动力学速率降低的原因。提出将总挥发性脂肪酸浓度和形态作为不同总固体含量下过程进展的指标。
