Department of Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, FL, 32816, USA.
Sci Rep. 2020 Jun 10;10(1):9379. doi: 10.1038/s41598-020-66159-7.
Ensuring urban areas have access to clean drinking water, safe food supply, and uncontaminated water bodies is essential to the good health of millions of urban residents. This paper presents the functionality of Iron Filings-based Green Environmental Media (IFGEM) in terms of nutrient removal efficiencies to support water quality management and urban farming. IFGEM uses recycled materials such as tire crumb and iron filings to help remove nutrients with essential physicochemical properties. In this study, IFGEM were proven effective and sustainable through an isotherm study, a column study of reaction kinetics, and a microstructure examination under various inlet nutrient concentration levels. IFGEMs exhibited over 90% nitrate removal, as well as 50-70% total phosphorus removal, under most inlet conditions. These promising results make IFGEM suitable for treating stormwater runoff, wastewater effluent, and agricultural discharge via varying ex situ treatment units in flexible landscape environments. In addition, the byproduct of ammonia generation permits possible reuse of spent IFGEM as soil amendments in crop land, gardens and yards, and green roofs for urban farming. Findings may help secure urban food supply chains and harmonize nutrients, soil, water, and waste management in different urban environments.
确保城市地区能够获得清洁的饮用水、安全的食品供应和未受污染的水体，这对数百万城市居民的健康至关重要。本文介绍了基于铁粉的绿色环保介质（IFGEM）在去除营养物方面的功能，以支持水质管理和城市农业。IFGEM 使用轮胎碎屑和铁粉等回收材料来帮助去除具有重要物理化学特性的营养物。在这项研究中，通过等温研究、反应动力学柱研究和不同入口营养物浓度水平下的微观结构检查，证明了 IFGEM 的有效性和可持续性。在大多数入口条件下，IFGEM 的硝酸盐去除率超过 90%，总磷去除率为 50-70%。这些有希望的结果使得 IFGEM 适合通过不同的场外处理单元在灵活的景观环境中处理雨水径流、废水和农业排放。此外，氨生成的副产物允许将用过的 IFGEM 作为土壤改良剂在农田、花园和庭院以及城市农业的绿色屋顶中再利用。研究结果可能有助于确保城市食品供应链的安全，并协调不同城市环境中的养分、土壤、水和废物管理。
