Service life of geosynthetic liners for containing municipal solid waste leachate and wastewater with and without per- and polyfluoroalkyl substances

用于容纳含有和不含全氟烷基物质和多氟烷基物质的城市固体废物渗滤液和废水的土工合成衬垫的使用寿命

• 批准号: RGPIN-2022-03928
• 负责人: Rowe, RKerry
• 金额: $ 7.21万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=749414
• 关键词: Service; life; geosynthetic; liners; containing

Municipal solid waste (MSW) landfill leachate and sewage water typically contain per- and polyfluoroalkyl substances [PFAS]. PFAS have significant health effects (e.g., cancer). They are "forever chemicals" that bioaccumulate in the food chain, ultimately reaching the human body. PFAS must be contained for many decades to many centuries. Ontario requires plastic liners (geomembranes) for MSW landfills to last 150 to 350 years for smaller and larger landfills, respectively. However, there are no generally accepted means of selecting liners that will meet these or the less stringent requirements for sewage and mining lagoons. Thus, there are failures. In 2021, I investigated 5 liner failures, including a 3-year old mining lagoon liner that discharged 11 million litres of contaminated water and another 15-year old liner that discharged 800 million litres of contaminated fluid. This research program will address the root causes of liner failures by developing: a fundamental understanding of the factors affecting the efficacy of liner systems, a method of reliably estimating their service life (how long they will effectively contain fluids), design guidelines for future facilities, and a means of assessing when a failure is likely for existing facilities so action can be taken to prevent contamination. The research funded by this grant will establish the efficacy and service life of the three main components of a liner system for containing PFAS. This will require considerations of both the applications and the materials, as illustrated below. Relatively new sewage lagoons in northern communities leak excessively because of liner failures due to the liners' inability to tolerate the effects of climate change, such as thawing permafrost. This research will evaluate current and alternative liner systems and develop guidelines for the selection of appropriate liners. Multicomponent geosynthetic clay liners combine both a plastic liner and a layer of clay in a single product that can minimize leakage to a negligible level for the (unknown) service life of the plastic components of the liner. This research will provide the first study of their service life. If the service life is adequate, they represent cost-effective liners for lagoons in remote communities, and part of the liner system for many mining lagoons and MSW landfills. The research will use unique facilities, including a full-scale liner test site and lab equipment that will enable the testing of the entire liner system under simulated field conditions. The research will reduce water contamination, and benefit Canadian design consultants, regulators, manufacturers, facility owners/operators, First Nations, and the general public who will all be able to place greater reliance on these liner systems and enhance Canada's international competitiveness and reputation for environmentally sustainable development. The research will train 7 PhD, 6 MASc and 5 undergraduate students.

市政固体废物（MSW）垃圾填埋场和污水水通常含有人均和多氟烷基物质[PFAS]。 PFA具有显着的健康影响（例如癌症）。它们是在食物链中生物积累的“永远的化学物质”，最终到达人体。 PFA必须包含数十年到数百年。安大略省需要MSW垃圾填埋场的塑料衬里（地膜），分别持续150至350年，分别为越来越大的垃圾填埋场。但是，没有公认的方法选择将满足这些衬里或对污水和采矿泻湖的严格要求。因此，有失败。在2021年，我调查了5次衬里故障，其中包括一个3岁的采矿泻湖衬里，该陆班衬里排放了1100万升污染的水和另一辆15岁的衬里，该衬里排放了8亿升污染的液体。该研究计划将通过开发来解决衬里失败的根本原因：对影响衬里系统功效的因素的基本理解，一种可靠地估算其使用寿命的方法（它们将有效地包含流体多长时间），对未来设施的设计指南，以及对现有设施可能何时进行何时进行验证的方法，因此可以采取何时采取污染物的污染物。这项赠款资助的研究将确定衬里系统三个主要组成部分的功效和服务寿命，以含有PFA。如下所示，这将需要考虑应用程序和材料。 由于衬里无法忍受气候变化的影响，例如融化的多年冻土，北部社区的污水泻湖相对较新，由于衬里失败而过度泄漏。这项研究将评估当前和替代的衬里系统，并制定选择适当衬里的准则。 多组分地质粘土衬里在单个产品中既将塑料衬里和一层粘土都结合在一起，可以将衬套塑料组件的（未知）使用寿命最小化至可忽略不计的水平。这项研究将为他们的服务寿命提供首次研究。如果使用寿命足够，它们代表了偏远社区的泻湖的具有成本效益的衬里，以及许多采矿泻湖和MSW垃圾填埋场的衬里系统的一部分。该研究将使用独特的设施，包括全尺寸的衬里测试站点和实验室设备，该设备将在模拟现场条件下对整个衬里系统进行测试。这项研究将减少加拿大设计顾问，监管机构，制造商，设施所有者/运营商，原住民和公众，他们将更加依赖这些外套系统，并增强加拿大对环境可持续发展的国际竞争力和声誉。这项研究将培训7博士学位，6个MASC和5名本科生。