Liotta Flavia, Esposito Giovanni, Fabbricino Massimiliano, van Hullebusch Eric D, Lens Piet N L, Pirozzi Francesco, Pontoni Ludovico
a Department of Civil and Mechanical Engineering , University of Cassino and Southern Lazio , Via Di Biasio, 43-03043 Cassino , FR , Italy.
b Department of Civil, Architectural and Environmental Engineering , University of Naples Federico II , Via Claudio, 21, 80125 Naples , Italy.
Environ Technol. 2016;37(5):505-12. doi: 10.1080/09593330.2015.1074288. Epub 2015 Sep 3.
This work investigates the start-up phase of anaerobic digestion in wet, semi-dry and dry conditions of rice straw analysing the role of volatile fatty acid (VFA) production on process kinetics. Methane production yields and biodegradation kinetics in reactors operated under wet semi-dry and dry conditions were investigated. The experimental results showed a reduction in the specific final methane production yield of 57% and 63% in, respectively, semi-dry (TS = 14.8%) and dry (TS = 23.4%) conditions compared to wet (TS = 4.8%) conditions. The total VFA concentration and speciation are proposed as indicators of process development at different total solids content. High VFA concentrations were found in dry conditions, with a maximum total VFA concentration of 2110 mg/kg in dry conditions, 930 mg/kg in semi-dry conditions and 180 mg/kg in wet conditions.
本研究通过分析挥发性脂肪酸（VFA）产生对工艺动力学的作用，探讨了稻草在湿式、半干式和干式条件下厌氧消化的启动阶段。研究了在湿式、半干式和干式条件下运行的反应器中的甲烷产率和生物降解动力学。实验结果表明，与湿式（总固体含量TS = 4.8%）条件相比，半干式（TS = 14.8%）和干式（TS = 23.4%）条件下的比最终甲烷产率分别降低了57%和63%。提出将总VFA浓度和形态作为不同总固体含量下工艺发展的指标。在干式条件下发现VFA浓度较高，干式条件下总VFA浓度最高为2110mg/kg，半干式条件下为930mg/kg，湿式条件下为180mg/kg。
