评估含煤底灰胶凝复合材料的环境风险和毒性:一个层次分析框架

IF 8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Ervin Shan Khai Tiu , Shi Hong Wong , Sudharshan N. Raman , Daniel Kong , Massoud Sofi , Guoqing Geng
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引用次数: 0

摘要

可持续实践越来越多地探索工业副产品的价值,同时解决与实践相关的潜在毒性影响。煤底灰(CBA)是一种煤燃烧副产物,在胶凝复合材料中的应用日益受到关注,但其长期的环境安全性仍令人担忧。本研究采用毒性特征浸出程序(TCLP)进行了分级毒性分析,以评估生CBA、煤粉煤灰(CFA)、优化地面CBA和两种包含优化地面CBA的胶凝体的浸出行为。采用ICP-MS进行理化表征,测定了11种微量元素(As、Ba、Cd、Co、Cr、Mn、Ni、Pb、Se、V、Zn)。相比之下,与CBA相比,CFA表现出更高的非合规元素(As, Cr, Mn, Se)的浸出(仅超过Mn的限制)。虽然磨矿提高了优化后的CBA中Mn和Ni的浸出率,但它们与胶结剂体系的结合显著降低了总体微量元素浓度。微量Ba浸出。这些发现表明,优化后的地面CBA可以掺入胶凝体中,渗滤液中微量元素浓度一直很低。所有被评估的微量元素的总体浸出率仍然很小,最大值仅为1.13 %,突出了所调查材料的环境安全性。这些成果支持将CBA从废物转变为可行的资源,与可持续做法和公共卫生考虑保持一致。本研究为指导水泥和混凝土行业的利益相关者以及政策制定者做出更明智的科学决策提供了重要见解,特别是在可持续废物管理和资源回收方面。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessing the environmental risk and toxicity of cementitious composites incorporating coal bottom ash: A hierarchical analysis framework
Sustainable practices increasingly explore the valorization of industrial by-products, while addressing potential toxicity implications associated with the practice. Coal bottom ash (CBA), a coal combustion by-product, is gaining attention for use in cementitious composites, though concerns remain regarding its long-term environmental safety. This study presents a hierarchical toxicity analysis using the Toxicity Characteristics Leaching Procedure (TCLP) to assess the leaching behavior across raw CBA, coal fly ash (CFA), optimized ground CBA, and two cementitious paste variations incorporating optimized ground CBA. Physico-chemical characterization was conducted through ICP-MS, quantifying eleven trace elements (As, Ba, Cd, Co, Cr, Mn, Ni, Pb, Se, V, Zn). In comparison, CFA exhibited higher leaching of non-compliant elements (As, Cr, Mn, Se) compared to CBA (exceeding limits only for Mn). While grinding increased Mn and Ni leachability in optimized ground CBA, their integration into cementitious binder systems significantly reduced overall trace element concentrations. Minor Ba leaching was observed. These findings demonstrate that optimized ground CBA is viable for incorporation into cementitious pastes, as evidenced by the consistently low trace element concentrations in the leachates. Overall leachability across all assessed trace elements remained minimal, with a maximum of only 1.13 %, highlighting the environmental safety of the investigated material. These outcomes support the potential transformation of CBA from waste into a viable resource, aligning with sustainable practices and public health considerations. This study provides critical insights to guide more informed scientific decision-making among stakeholders in the cement and concrete sectors, as well as policymakers, particularly in sustainable waste management and resource recovery.
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来源期刊
Construction and Building Materials
Construction and Building Materials 工程技术-材料科学:综合
CiteScore
13.80
自引率
21.60%
发文量
3632
审稿时长
82 days
期刊介绍: Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.
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