GeoEngineering Centre at Queen’s-RMC, Department of Civil Engineering, Queen’s University, Kingston, Ontario, Canada K7L 3N6.
Waste Manag. 2012 May;32(5):901-11. doi: 10.1016/j.wasman.2011.12.026. Epub 2012 Feb 4.
Heat generated by the biodegradation of waste and other chemical processes in a landfill can potentially affect the long-term performance of landfill liner system, in particular that of a high-density polyethylene geomembrane. In a double liner system, the difference in leachate exposure and temperature might improve the long-term performance of the secondary geomembrane compared to that of the primary geomembrane. However, in some cases, the temperature is likely to be high enough to substantially reduce the service-life of the secondary geomembrane. This study explores the possible effectiveness of using tire chips as thermal insulation between primary and secondary liners to reduce the temperature of secondary geomembranes as compared to traditional soil materials. Heat and contaminant migration analyses are performed for cases with no insulation and for cases in which a layer of soil or tire chips has been used as thermal insulation between the primary and secondary liners. The effect of insulation on prolonging the service-life of a secondary geomembrane and, consequently, on contaminant transport through a liner system is examined for the case of a volatile organic compound (dichloromethane) found in landfill leachate. The study suggests that the use of tire chips warrants consideration, however there are other practical issues that require consideration in the detailed design and construction of landfill liners. Issues such as finite service-life, low working temperature, excessive settlement, ability to generate internal heat, leaching of tire chips and limitations in performing electrical resistivity leak detection tests are identified.
垃圾填埋场中废物的生物降解和其他化学过程产生的热量可能会影响填埋场衬垫系统的长期性能，特别是高密度聚乙烯土工膜的性能。在双层衬垫系统中，沥滤液暴露和温度的差异可能会提高次衬垫的长期性能，与主衬垫相比。然而，在某些情况下，温度可能高到足以大大缩短次衬垫的使用寿命。本研究探讨了在主衬垫和次衬垫之间使用轮胎碎片作为隔热材料的可能性，以降低次土工膜的温度，与传统的土壤材料相比。对无隔热层的情况和在主衬垫和次衬垫之间使用土壤或轮胎碎片作为隔热层的情况进行了热和污染物迁移分析。对于在填埋场沥滤液中发现的挥发性有机化合物（二氯甲烷）的情况，考察了隔热层对延长次土工膜使用寿命的影响，从而考察了对衬垫系统中污染物迁移的影响。研究表明，使用轮胎碎片是值得考虑的，然而，在详细设计和建造填埋场衬垫时，还需要考虑其他实际问题。确定了有限的使用寿命、工作温度低、过度沉降、产生内部热量的能力、轮胎碎片浸出以及进行电阻率渗漏检测测试的限制等问题。
