Stormwater represents a major non-point pollution source at an urban environment. To improve the treatment efficacy of stormwater infrastructure, low-cost adsorbents have increasingly gained attention over the past decades. This article aims to briefly discuss several key aspects and principles for utilization of low-cost adsorbents for urban stormwater treatment. To determine whether a low-cost adsorbent is suitable for stormwater treatment, two aspects should be carefully assessed, including: 1) its adsorption mechanisms and behaviors that can influence the binding strength, adsorption kinetics, and treatment capacity; and 2) unwanted chemical leaching patterns that can affect the extent of water quality degradation. Furthermore, the application mode of an adsorbent in the system design influences the utilization efficiency. Adsorbents, after dosed to soil media in infrastructure, would eventually become ineffective after oversaturation. In contrast, standalone filters or innovative composite adsorbents (e.g., adsorbent-coated mulch chips) can enable a long-lasting adsorption due to periodic replacement with fresh adsorbents. The aforementioned principles play a key role in the success of urban stormwater treatment with low-cost adsorbents.

雨水是城市环境中主要的面源污染源。为了提高雨水基础设施的处理效率，在过去的几十年中，低成本吸附剂越来越受到关注。本文旨在简要讨论利用低成本吸附剂处理城市雨水的几个关键方面和原理。为了确定低成本吸附剂是否适合雨水处理，应仔细评估两个方面，包括：1）可能影响结合强度，吸附动力学和处理能力的吸附机理和行为。2）有害的化学浸出模式会影响水质下降的程度。此外，系统设计中吸附剂的施用方式会影响利用率。吸附剂 注入基础设施中的土壤介质后，过饱和后最终将失效。相反，由于定期用新鲜的吸附剂替换，独立的过滤器或创新的复合吸附剂（例如，涂覆有吸附剂的覆盖碎片）可以实现持久的吸附。上述原则在使用低成本吸附剂成功处理城市雨水中起着关键作用。