Ziaee Fazel, Mokhtarani Nader, Pourrostami Niavol Kasra
Civil and Environmental Engineering Faculty, Tarbiat Modares University, Tehran, Iran.
Department of Civil and Environmental Engineering, Temple University, Philadelphia, PA, USA.
Biodegradation. 2021 Jun;32(3):299-312. doi: 10.1007/s10532-021-09937-y. Epub 2021 Apr 11.
Municipal solid waste contains mainly organic wastes that can be a good source for anaerobic digestion. Solid-state anaerobic digestion is an affordable and suitable technique to mitigate the organic fraction of municipal solid waste (OFMSW). However, as the organic loading of OFMSW is high, co-digestion with other materials can improve the system's performance. This study aimed to investigate the performance of the co-digestion of OFMSW and sawdust and study the parameters affecting its performance. Based on the experiments, the optimum sawdust/OFMSW ratio was achieved 1:2 with the methane production of 0.3 L/g VS. In addition, the inoculum-to-substrate ration (I/S) was investigated at 1:4, 1:2, 1:1, 2:1 ratios. The best result was obtained at 2:1 ratio with a total methane yield of 0.28 L/g VS. The results also indicated that I/S ratios less than 1:1 led to fatty acid accumulation and acidic pH condition. The effect of total solids content on the co-digestion process was also examined in this study. According to the results, as the total solids increased, the biomethane yield decreased while the biogas content increased.
城市固体废物主要包含有机废物，这些有机废物可以成为厌氧消化的良好原料。固态厌氧消化是一种经济适用的技术，可用于减少城市固体废物中的有机成分（OFMSW）。然而，由于OFMSW的有机负荷较高，与其他材料共同消化可以提高系统性能。本研究旨在研究OFMSW与锯末共同消化的性能，并研究影响其性能的参数。基于实验，锯末/OFMSW的最佳比例为1:2，甲烷产量为0.3 L/g VS。此外，还研究了接种物与底物比例（I/S）为1:4、1:2、1:1、2:1时的情况。在2:1的比例下获得了最佳结果，总甲烷产量为0.28 L/g VS。结果还表明，I/S比例小于1:1会导致脂肪酸积累和酸性pH条件。本研究还考察了总固体含量对共同消化过程的影响。根据结果，随着总固体含量的增加，生物甲烷产量下降，而沼气含量增加。
