Due to the lack of tools, which are simple enough to assess the reuse strategy in the concept of circular economy (CE), in the present paper, reuse efficiency index (REI) was introduced as a new indicator, inspired by previously developed indexes, namely circular economy index (CEI) and value-based resource efficiency (VRE). The REI, as a measure of economic efficiency of reuse strategy, is the ratio of the net value obtained from the reuse of end of life (EOL) product instead of using a new product over the value of materials and energy inputs required to reproduce the EOL product. To calculate REI for any specific EOL product, information regarding mass, physicochemical properties and operational data on the consumption of energy, which are mainly available in the financial archives of companies, is crucial and the market price of EOL product must also be predicted. In another part of the study, the reuse of ferric chloride-based water treatment sludge (FCS) as a coagulant, instead of using high cost polymeric coagulant, for iron ore tailings slurry dewatering was evaluated through REI. The results showed that depending on the market prices of energy and materials as well as the iron (FeCl3) content in the FCS, the REI could vary between 0.51 and 1.04, corresponding to 51–104% added value. Overall, REI is based on accessible information and its simplicity and comprehensibility makes it applicable for managers and policymakers to invest and create technologies for reaching closed-loop cycles in the concept of CE through reuse action.

中文翻译：

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通过再利用策略开发稳健指标来评估循环经济：使用水处理污泥作为铁矿石尾矿浆脱水的混凝剂的案例研究


由于缺乏简单到足以评估循环经济 （CE） 概念中再利用策略的工具，在本文中，再利用效率指数 （REI） 被引入作为新指标，受到先前开发的指数的启发，即循环经济指数 （CEI） 和基于价值的资源效率 （VRE）。REI 作为衡量再利用策略经济效率的指标，是从重复使用生命周期终止 （EOL） 产品而不是使用新产品中获得的净值与复制 EOL 产品所需的材料和能源输入价值的比率。要计算任何特定 EOL 产品的 REI，有关质量、物理化学性质和能源消耗操作数据的信息（主要位于公司的财务档案中）至关重要，还必须预测 EOL 产品的市场价格。在研究的另一部分，通过 REI 评估了将基于三氯化铁的水处理污泥 （FCS） 再用作混凝剂，而不是使用高成本的聚合物混凝剂，用于铁矿石尾矿浆脱水。结果表明，根据能源和材料的市场价格以及 FCS 中的铁 （FeCl3） 含量，REI 可能在 0.51 和 1.04 之间变化，相当于 51-104% 的附加值。总体而言，REI 基于可访问的信息，其简单性和可理解性使其适用于管理者和政策制定者投资和创造技术，以通过再利用行动达到 CE 概念中的闭环循环。