Department of Civil, Environmental and Ocean Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA.
Department of Civil and Mineral Engineering, University of Toronto, Toronto, ON M5S 1A4, Canada.
Molecules. 2022 Oct 24;27(21):7194. doi: 10.3390/molecules27217194.
Over the past several decades, the value of drinking water treatment residuals (WTRs), a byproduct of the coagulation process during water purification, has been recognized in various environmental applications, including sustainable remediation of phosphorus (P)-enriched soils. Aluminum-based WTRs (Al-WTRs) are suitable adsorbent materials for P, which can be obtained and processed inexpensively. However, given their heterogeneous nature, it is essential to identify an easily analyzable chemical property that can predict the capability of Al-WTRs to bind P before soil amendment. To address this issue, thirteen Al-WTRs were collected from various geographical locations around the United States. The non-hazardous nature of the Al-WTRs was ascertained first. Then, their P adsorption capacities were determined, and the chemical properties likely to influence their adsorption capacities were examined. Statistical models were built to identify a single property to best predict the P adsorption capacity of the Al-WTRs. Results show that all investigated Al-WTRs are safe for environmental applications, and oxalate-extractable aluminum is a significant indicator of the P adsorption capacity of Al-WTRs (-value = 0.0002, R = 0.7). This study is the first to report a simple chemical test that can be easily applied to predict the efficacy of Al-WTRs in binding P before their broadscale land application.
在过去几十年中，饮用水处理残渣（WTR）的价值在各种环境应用中得到了认可，包括富磷土壤的可持续修复。基于铝的 WTR（Al-WTR）是磷的合适吸附材料，可廉价地获得和加工。然而，鉴于其不均匀的性质，确定一种易于分析的化学性质来预测 Al-WTR 结合 P 的能力在土壤改良之前是至关重要的。为了解决这个问题，从美国各地收集了 13 种 Al-WTR。首先确定了 Al-WTR 的非危害性。然后，测定了它们的磷吸附容量，并检查了可能影响其吸附容量的化学性质。建立了统计模型来识别一种单一的特性，以最好地预测 Al-WTR 的磷吸附容量。结果表明，所有研究的 Al-WTR 都可安全用于环境应用，草酸盐可提取的铝是 Al-WTR 磷吸附容量的重要指标（-值=0.0002，R=0.7）。这项研究首次报道了一种简单的化学测试，可以在 Al-WTR 大规模土地应用之前，很容易地应用于预测其结合 P 的效果。
