Pavan P, Battistoni P, Cecchi F, Mata-Alvarez J
University of Venice, Department of Environmental Sciences, Dorsoduro 2137, I-30123 Venice, Italy.
Water Sci Technol. 2000;41(3):111-8.
The results of a two-phase system operated in different conditions, treating the source-sorted organic fraction of municipal solid waste (SS-OFMSW), coming mainly from fruit and vegetable markets, are presented. Hydraulic retention time (HRT) in the hydrolytic reactor and in the methanogenic reactor and also the temperature in the hydrolytic reactor (mesophilic and thermophilic conditions) are varied in order to evaluate the effect of these factors. The methanogenic reactor is always operated within the thermophilic range. Optimum operating conditions are found to be around 12 days (total system) using the mesophilic range of temperature in the first reactor. Specific gas production (SGP) in these conditions is around 0.6 m3/kg TVS. A kinetic study is also carried out, using the first and the step diffusional models. The latter gives much better results, with fitted constants comparable to other studies. Finally, a comparison with a one-phase system is carried out, showing that a two-phase system is much more appropriate for the digestion of this kind of highly biodegradable substrate in thermophilic conditions.
本文展示了一个在不同条件下运行的两相系统处理主要来自果蔬市场的源头分类城市有机生活垃圾（SS - OFMSW）的结果。水解反应器和产甲烷反应器中的水力停留时间（HRT）以及水解反应器中的温度（中温及高温条件）有所变化，以评估这些因素的影响。产甲烷反应器始终在高温范围内运行。发现使用第一个反应器的中温温度范围时，最佳运行条件约为12天（整个系统）。在这些条件下的特定气体产量（SGP）约为0.6立方米/千克挥发性固体（TVS）。还使用一级扩散模型和分步扩散模型进行了动力学研究。后者给出了更好的结果，拟合常数与其他研究相当。最后，与单相系统进行了比较，结果表明两相系统更适合在高温条件下消化这种高度可生物降解的底物。
