Micolucci Federico, Gottardo Marco, Cavinato Cristina, Pavan Paolo, Bolzonella David
Department of Biotechnology, University of Verona, Verona 37134, Italy.
Department of Environmental Sciences, Informatics and Statistics, Venice 30121, Italy.
Waste Manag. 2016 Feb;48:227-235. doi: 10.1016/j.wasman.2015.09.031. Epub 2015 Oct 1.
Deep separate collection of the organic fraction of municipal solid waste generates streams with relatively low content of inert material and high biodegradability. This material can be conveniently treated to recovery both energy and material by means of simplified technologies like screw-press and extruder: in this study, the liquid fraction generated from pressed biowaste from kerbside and door-to-door collection was anaerobically digested in both mesophilic and thermophilic conditions while for the solid fraction composting is suggested. Continuous operation results obtained both in mesophilic and thermophilic conditions indicated that the anaerobic digestion of pressed biowaste was viable at all operating conditions tested, with the greatest specific gas production of 0.92m(3)/kgVSfed at an organic loading rate of 4.7kgVS/m(3)d in thermophilic conditions. Based on calculations the authors found that the expected energy recovery is highly positive. The contents of heavy metals and pathogens of fed substrate and effluent digestates were analyzed, and results showed low levels (below End-of-Waste 2014 criteria limits) for both the parameters thus indicating the good quality of digestate and its possible use for agronomic purposes. Therefore, both energy and material were effectively recovered.
对城市固体废物的有机部分进行深度分离收集，可产生惰性物质含量相对较低且生物降解性高的物流。这种物质可以通过螺旋压榨机和挤出机等简化技术方便地进行处理，以回收能源和材料：在本研究中，路边和挨家挨户收集的压缩生物废物产生的液体部分在中温和高温条件下进行厌氧消化，而对于固体部分，则建议进行堆肥处理。在中温和高温条件下获得的连续运行结果表明，在所有测试的运行条件下，压缩生物废物的厌氧消化都是可行的，在高温条件下，有机负荷率为4.7kgVS/m³·d时，最大比产气率为0.92m³/kgVS进料。基于计算，作者发现预期的能量回收非常可观。分析了进料底物和消化液流出物中的重金属和病原体含量，结果表明这两个参数的含量都很低（低于2014年废物终态标准限值），因此表明消化液质量良好，可用于农业目的。因此，能源和材料都得到了有效回收。
