Ecosphere Resilience Research Center, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda 10250, Sri Lanka.
Illinois Sustainable Technology Center, University of Illinois at Urbana Champaign, Champaign-, United States of America.
Sci Total Environ. 2023 Jul 15;882:163340. doi: 10.1016/j.scitotenv.2023.163340. Epub 2023 Apr 19.
Construction and Demolition (C&D) waste is solid wastes generated from the construction, demolition, and renovation activities that constitute almost 30-40 % of globally generated solid wastes. Improper disposal and management of these materials can cause negative impacts on the environment, economy, and human health. Most research on C&D waste is limited to reduction, recycling, and reuse of the wastes. However, there is no systematic review dedicated entirely to the applicability of C&D wastes as adsorbent for waste management. This review presents the utilization of C&D wastes-based adsorbents for removing contaminants from environmental matrices covering triple edge benefits in the viewpoints of waste treatment, solid waste management, and disposal. The properties, the capability of C&D waste adsorbents on contaminant removal, and the influence of various factors on the adsorptive removal is detailed. Further, the mechanisms involved in contaminant removal by C&D waste are summarized. The review revealed that, chemisorption is the prominent mechanism of contaminant removal by most C&D wastes. Among the three types of C&D waste reviewed; concrete-based adsorbents were the most efficient for contaminant removal. Limited studies are avaiable in the literature on binary and multiple contaminant systems, reusability studies, and high dependence on solution pH, therefore further studies are warrated. As C&D waste contain trace concentration of heavy metals and contaminants, its leaching potential at different pH levels and adsorbate concentration need to be conducted, which has been hitherto neglected. Finally, the approaches, obstacles, and potential solutions to build an industrially and economically efficient C&D adsorbent are discussed.
建筑和拆除（C&D）废物是在建筑、拆除和翻新活动中产生的固体废物，约占全球产生的固体废物的 30-40%。这些材料如果处理和管理不当，可能会对环境、经济和人类健康造成负面影响。大多数关于 C&D 废物的研究都限于减少、回收和再利用这些废物。然而，目前还没有专门针对 C&D 废物作为吸附剂用于废物管理的系统评价。本综述介绍了基于 C&D 废物的吸附剂在去除环境基质中污染物方面的应用，从废物处理、固体废物管理和处置的角度来看具有三重优势。详细介绍了 C&D 废物吸附剂的性质、去除污染物的能力以及各种因素对吸附去除的影响。此外，还总结了 C&D 废物去除污染物的机制。综述表明，化学吸附是大多数 C&D 废物去除污染物的主要机制。在所综述的三种 C&D 废物中；基于混凝土的吸附剂对污染物的去除效率最高。文献中关于二元和多元污染物体系、可重复使用性研究以及对溶液 pH 值高度依赖的研究有限，因此需要进一步研究。由于 C&D 废物中含有痕量浓度的重金属和污染物，因此需要对其在不同 pH 值和吸附物浓度下的浸出潜力进行研究，而这一点迄今为止一直被忽视。最后，讨论了构建工业和经济高效的 C&D 吸附剂的方法、障碍和潜在解决方案。
