The importance of biofilm in tire derived aggregates (TDA) based underground systems has been investigated in this paper, to assess the utilization of tire waste as a cost-effective and sustainable resource for stormwater treatment. The primary objective of this study is to look into the role of biofilms in preventing metal leaching from a TDA based stormwater treatment system and to estimate the life span of a TDA based stormwater treatment system. TDA subjected to different influents to promote or limit the growth of biofilms were analyzed for their leaching and adsorption potential for fifteen different metals through 72 flushes, which is representative of roughly 9 years of TDA exposure to storm events in the upper Midwest USA. Biofilm growth on a manufacturing byproduct (wire exposed-TDA) was higher than on the traditional TDA. The presence of biofilm on TDA had a minor impact on orthophosphate adsorption as observed in a previous study conducted by the authors. However, metals such as iron, zinc and copper, which were previously a concern, had substantially lower leaching into the stored runoff. In addition, the orthophosphate removal from runoff by TDA with a biofilm through 72 flushes indicates that TDA based underground systems can have orthophosphate removal life span beyond 8–9 years. Thus, TDA with biofilms in an underground storage/infiltration chamber has the potential to establish itself as a sustainable, cost-effective, and long life-span alternative for stormwater remediation of orthophosphate pollution without leaching of metals.

中文翻译：

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了解生物膜的作用并估计基于轮胎的骨料的地下雨水处理系统的寿命


本文研究了生物膜在基于轮胎衍生骨料 (TDA) 的地下系统中的重要性，以评估轮胎废料作为雨水处理的成本效益和可持续资源的利用情况。本研究的主要目的是研究生物膜在防止基于 TDA 的雨水处理系统中金属浸出方面的作用，并估计基于 TDA 的雨水处理系统的使用寿命。通过 72 次冲洗，TDA 经受不同进水以促进或限制生物膜的生长，分析其对 15 种不同金属的浸出和吸附潜力，这代表了 TDA 暴露于美国中西部北部风暴事件的大约 9 年。制造副产品（线暴露-TDA）上的生物膜生长速度高于传统 TDA。正如作者之前进行的一项研究中观察到的，TDA 上生物膜的存在对正磷酸盐的吸附影响较小。然而，以前令人担忧的铁、锌和铜等金属在储存径流中的浸出量大大减少。此外，通过 72 次冲洗，TDA 与生物膜从径流中去除正磷酸盐表明，基于 TDA 的地下系统的正磷酸盐去除寿命可以超过 8-9 年。因此，在地下储存/渗透室中使用生物膜的 TDA 有可能成为一种可持续、经济高效且使用寿命长的替代方案，用于正磷酸盐污染的雨水修复而不浸出金属。