1 Geotechnical Engineering Research Institute, Hohai University, Nanjing, China.
2 Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, China.
Waste Manag Res. 2019 May;37(5):530-541. doi: 10.1177/0734242X19833156. Epub 2019 Mar 5.
High temperature may adversely affect municipal solid waste (MSW) biodegradation and lead to an increase in the deformation of high-density polyethylene (HDPE) pipes used for the collection of leachate and landfill gas in landfills. The test in this study was to change the waste temperature around the vertical injection well by water injection using a vertical well. The test was conducted intermittently with two different flowrates in a newly filled MSW layer of a landfill. The temperature, gas pressure and leachate level in the test area were simultaneously monitored during this study. The results showed that the waste temperature around the vertical injection well was effectively changed by water injection, which did not result in a significant rise in the leachate level. During water injection, the waste temperature influence distance in the horizontal direction increased with depth from the leachate level to the bottom of the injection well. The bottom temperature of the injection well decreased to near the water-injection temperature. The range of influence of the waste temperature caused by intermittent water injections slightly increased in this test. After water injection was stopped, the waste temperature near the vertical injection well increased quickly initially, and then the increments became more gradual with time. When the leachate level recovered stably, there was still a temperature gradient around the injection well within the range of influence. The temperature and gas pressure in the waste above the leachate level and far away from the injection well were slightly influenced by water injection.
高温可能会对城市固体废物（MSW）的生物降解产生不利影响，并导致用于收集渗滤液和垃圾填埋气的高密度聚乙烯（HDPE）管道在垃圾填埋场中的变形增加。本研究中的测试是通过垂直井注水来改变垂直注入井周围的废物温度。该测试在一个新填充的垃圾填埋场的 MSW 层中以两种不同的流速间歇进行。在这项研究中，同时监测了测试区域内的温度、气体压力和渗滤液水平。结果表明，通过注水有效地改变了垂直注入井周围的废物温度，而不会导致渗滤液水平显著升高。在注水期间，从渗滤液水平到注入井底部的水平方向上，废物温度影响距离随深度增加而增加。注入井底部的温度降低到接近注水温度。在本次测试中，间歇注水引起的废物温度影响范围略有增加。注水停止后，垂直注入井附近的废物温度最初迅速升高，然后随着时间的推移，增量变得更加渐进。当渗滤液水平稳定恢复时，在注入井影响范围内仍然存在温度梯度。位于渗滤液层上方且远离注入井的废物中的温度和气体压力受到注水的轻微影响。
