Recycling potential of secondary resources in built environment stocks: Evidence from Hong Kong public rental housing

IF 5.4 3区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Xiaoyi Liu, Zhongnan Ye, Shu-Chien Hsu, Chi-Sun Poon
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Abstract

In urban environments, region-specific knowledge of building material intensities and stocks is vital for efficient resource recovery in the construction sector, especially for city regeneration and redevelopment. Previous studies often relied on generalized data, leading to inaccuracies due to local variations in construction practices, materials, and urban density. This study addresses these limitations by developing a locally refined inventory through a GIS-based, bottom-up material stock analysis that integrates archetype-specific building design data, demonstrated with evidence from Hong Kong's public rental housing (PRH). The results show that material intensities for Hong Kong PRH buildings range from 1567 to 2386 kg/m2, with a total stock of 60.85 megatons as of 2022. Up to 46.95 megatons may have recycling potential over the next three decades, offering significant opportunities for sustainable resource management. Spatiotemporal and hotspot identification reveals a shift in material stock distribution toward the northern territories, reflecting urban development trends. This research enhances the accuracy of material stock assessments and supports strategic planning for achieving a circular economy, particularly in densely populated areas like Hong Kong. By promoting circular and generative city concepts and establishing benchmark archives for key construction materials, the study advances practical applications for sustainable urban resource management, aiding policy development for efficient spatial planning and urban mining strategies.

Abstract Image

建筑环境存量中二次资源的回收潜力:以香港公共租赁房屋为例
在城市环境中,关于建筑材料强度和存量的特定区域知识对于建筑部门有效地回收资源,特别是城市再生和再开发至关重要。以前的研究往往依赖于广义的数据,由于建筑实践、材料和城市密度的地方差异,导致不准确。本研究通过基于地理信息系统的自下而上的材料库存分析,整合了特定原型的建筑设计数据,并以香港公共租赁房屋(PRH)为证据,开发了一份本地精细化的清单,从而解决了这些局限性。结果显示,截至2022年,香港公屋建筑的材料强度在1567至2386公斤/平方米之间,总库存为600.85兆吨。在未来三十年,可能有多达46.95兆吨的回收潜力,为可持续资源管理提供了重要机会。时空和热点识别表明,物资存量分布向北部地区转移,反映了城市发展趋势。这项研究提高了材料库存评估的准确性,并为实现循环经济的战略规划提供了支持,特别是在香港这样人口稠密的地区。通过推广循环和再生城市概念,建立关键建筑材料的基准档案,该研究推进了可持续城市资源管理的实际应用,帮助制定有效的空间规划和城市采矿战略的政策。
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来源期刊
Journal of Industrial Ecology
Journal of Industrial Ecology 环境科学-环境科学
CiteScore
11.60
自引率
8.50%
发文量
117
审稿时长
12-24 weeks
期刊介绍: The Journal of Industrial Ecology addresses a series of related topics: material and energy flows studies (''industrial metabolism'') technological change dematerialization and decarbonization life cycle planning, design and assessment design for the environment extended producer responsibility (''product stewardship'') eco-industrial parks (''industrial symbiosis'') product-oriented environmental policy eco-efficiency Journal of Industrial Ecology is open to and encourages submissions that are interdisciplinary in approach. In addition to more formal academic papers, the journal seeks to provide a forum for continuing exchange of information and opinions through contributions from scholars, environmental managers, policymakers, advocates and others involved in environmental science, management and policy.
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