Barreira L P, Philippi Junior A, Rodrigues M S, Tenório J A S
Department of Environmental Health, University of Sao Paulo, School of Public Health, Av. Dr. Arnaldo 715, Sao Paulo, SP 01246-904, Brazil.
Waste Manag. 2008;28(8):1417-22. doi: 10.1016/j.wasman.2007.05.023. Epub 2007 Sep 12.
Nowadays the composting process has shown itself to be an alternative in the treatment of municipal solid wastes by composting plants. However, although more than 50% of the waste generated by the Brazilian population is composed of matter susceptible to organic composting, this process is, still today, insufficiently developed in Brazil, due to low compost quality and lack of investments in the sector. The objective of this work was to use physical analyses to evaluate the quality of the compost produced at 14 operative composting plants in the Sao Paulo State in Brazil. For this purpose, size distribution and total inert content tests were done. The results were analyzed by grouping the plants according to their productive processes: plants with a rotating drum, plants with shredders or mills, and plants without treatment after the sorting conveyor belt. Compost quality was analyzed considering the limits imposed by the Brazilian Legislation and the European standards for inert contents. The size distribution tests showed the influence of the machinery after the sorting conveyer on the granule sizes as well as the inert content, which contributes to the presence of materials that reduce the quality of the final product.
如今，堆肥过程已成为堆肥厂处理城市固体废物的一种替代方法。然而，尽管巴西人口产生的废物中超过50%是易进行有机堆肥的物质，但由于堆肥质量低以及该领域缺乏投资，如今这一过程在巴西仍未得到充分发展。这项工作的目的是通过物理分析来评估巴西圣保罗州14家运营中的堆肥厂所生产堆肥的质量。为此，进行了粒度分布和总惰性成分测试。根据生产工艺将这些工厂分组，对结果进行了分析：有转鼓的工厂、有切碎机或磨机的工厂以及在分拣输送带后未经处理的工厂。考虑到巴西立法规定的限值和欧洲关于惰性成分的标准，对堆肥质量进行了分析。粒度分布测试表明，分拣输送带后的机械设备对颗粒大小以及惰性成分有影响，这导致了降低最终产品质量的物质的存在。
