Laboratory of Solid and Hazardous Waste Management, Department of Environmental Engineering, School of Engineering, Democritus University of Thrace, Vas. Sofias 12, Xanthi 671 00, Greece.
J Environ Manage. 2013 Jan 30;115:32-41. doi: 10.1016/j.jenvman.2012.10.054. Epub 2012 Dec 13.
Wrapped bales can be temporarily used to store municipal solid wastes (MSW) prior to treatment or final disposal. The degree of transformation of wastes within the bales can determine the method to treat MSW after their storage. Goal of the research described in this paper was to monitor the decomposition of the organic fraction of MSW stored in wrapped bales. The monitoring was based on the momentary volumetric concentrations of O(2), CO(2) and CH(4) that were regularly measured in the centre of 23 low density polyethylene (LDPE) wrapped bales over a 617-day period. The field experiment was designed at two levels and four factors, based on the principles of fractional factorial designs. The factors that were studied were: shredding, waste particle size and waste density, thickness of wrapping layers, and type of wrapping film. Two bales were randomly chosen and opened after one year of storage and their solid contents were analysed. Results indicate that carbon dioxide was the prevalent decomposition gaseous product that started from around 80% (v/v) and gradually diminished to around 20%. A non-steady methanogenic phase was established after 150 days from initial wrapping and lasted for approximately 150 days. Methane concentration never exceeded 17%, on average, in the interior of the bales. A 40% dry mass reduction was measured after one year of storage in two bales that contained 74% organics. The factorial analysis revealed that particle size/density and film type were the two main factors that significantly affected methane and carbon dioxide generation.
包裹的捆包可暂时用于储存城市固体废物 (MSW)，以便在处理或最终处置之前进行储存。捆包内废物的转化程度可以决定储存后处理 MSW 的方法。本文描述的研究旨在监测储存在包裹捆包中的 MSW 有机部分的分解情况。监测基于在 617 天内定期测量中心的 O(2)、CO(2)和 CH(4)的瞬间体积浓度，共测量了 23 个低密度聚乙烯 (LDPE) 包裹捆包。该现场实验基于部分因子设计原理，在两个水平和四个因素下进行设计。研究的因素包括：粉碎、废物粒径和废物密度、包裹层的厚度以及包裹膜的类型。在储存一年后，随机选择两个捆包并打开，分析其固体含量。结果表明，二氧化碳是主要的分解气体产物，从大约 80%（v/v）开始逐渐减少到大约 20%。在初始包裹后 150 天建立了非稳态产甲烷阶段，持续了大约 150 天。甲烷浓度在捆包内部平均从未超过 17%。在储存一年后，两个包含 74%有机物的捆包中测量到 40%的干物质减少。因子分析表明，粒径/密度和膜类型是显著影响甲烷和二氧化碳生成的两个主要因素。
