Resources Conservation and Recycling最新文献

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Global impacts of dam expansion on land use and landscape pattern 大坝扩张对土地利用和景观格局的全球影响

IF 10.9 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Resources Conservation and Recycling

Pub Date : 2026-04-01 Epub Date: 2026-02-05 DOI: 10.1016/j.resconrec.2026.108832

Chiwei Xiao , Xuan Fu , Mingtao Xiang , Jeffrey Chiwuikem Chiaka

Dams are vital for water resource security and energy supply, yet they present a significant challenge to terrestrial ecosystems. Most existing studies focus on a single region, lacking comprehensive analysis of the impacts of various types of dams on land use and land cover change (LULC) and landscape patterns as well as their gradient effects at a global scale. This study systematically analyzed the impact of global dams on the surrounding environment within 5-km gradient buffer zones, utilizing data from 6763 dams constructed between 1984 and 2018 in the Global Dam Tracker (GDAT) and the GLC_FCS30D global 30 m LULC data (1985–2020), alongside land use dynamics and landscape pattern indices. The results showed that from 1984 to 2018, new dams were primarily built in developing countries in Asia (3277 dams) and Africa (2079 dams) in the last 35 years. The majority of these dams were built for irrigation (32%) and hydroelectric power (20%). The construction of these dams resulted in a 120% increase in impervious surfaces and a 6% deforestation rate within the 5-km buffer zone, and the integrated land use dynamicity in the near-dam zone (0–2 km) was significantly higher than in the far-dam zone. Among them, irrigation dams exhibited the steepest distance decay rates, indicating the strongest impact on the surrounding land-use dynamics. After 1995, there was an increase in landscape fragmentation (patch density (PD)) and Shannon’s diversity index (SHDI) increased, while the aggregation index (AI) and mean patch area (AREA_MN) decreased. Our study provides a reference base for assessing the ecological effects of dams and managing them sustainably around the world.

大坝对水资源安全和能源供应至关重要，但对陆地生态系统构成了重大挑战。现有研究大多集中在单一区域，缺乏在全球尺度上对各类水坝对土地利用和土地覆盖变化（LULC）、景观格局的影响及其梯度效应的综合分析。本研究利用全球水坝追踪系统（GDAT）和GLC_FCS30D全球30 m LULC数据（1985-2020）中1984 - 2018年间建成的6763座水坝的数据，以及土地利用动态和景观格局指数，系统分析了全球水坝对5公里梯度缓冲区内周边环境的影响。结果表明，从1984年到2018年，在过去的35年里，新水坝主要建在亚洲（3277座水坝）和非洲（2079座水坝）的发展中国家。这些水坝大部分用于灌溉（32%）和水力发电（20%）。这些水坝的建设导致5 km缓冲区内不透水地表面积增加120%，森林砍伐率增加6%，近坝区（0-2 km）的综合土地利用动态显著高于远坝区。其中，灌溉坝的距离衰减速率最大，对周边土地利用动态影响最大。1995年以后，景观破碎化程度（斑块密度）增加，Shannon多样性指数（SHDI）增加，聚集指数（AI）和平均斑块面积（AREA_MN）减少。本研究为世界范围内大坝生态效应评估和可持续管理提供了参考依据。

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引用次数: 0

Alkali-activated mechanochemical decontamination of spent SCR catalysts: phase reconstruction for selective arsenic removal and vanadium recovery 碱活化SCR废催化剂的机械化学净化：选择性除砷和回收钒的相重构

IF 10.9 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Resources Conservation and Recycling

Pub Date : 2026-04-01 Epub Date: 2026-02-04 DOI: 10.1016/j.resconrec.2026.108829

Wenbin Hu , Congcong Li , Chenye Wang , Yan Li , Huiquan Li , Xinrui Wang , Feng Xie

Spent SCR catalysts contain toxic arsenic (As), valuable vanadium (V) and tungsten (W), posing dual hazards and resource challenges. Conventional recycling methods struggle with the selective removal of arsenic without compromising the carrier or fully recovering valuable metals. Here, an alkali-activated mechanochemical process that overcomes these limitations, achieving >99% As removal and 97% V recovery, while retaining approximately 23.4% of W in the TiO₂ carrier, allowing for direct catalyst regeneration. Mechanistic analyses confirm NaOH-triggered surface TiO₂ dissolution causes pore collapse, liberating encapsulated As/V species for reconstruction into soluble NaAsO₂/NaVO₃. XRD/EPR/XPS characterization verifies Na₂WO₄ formation through W-O bond restructuring. DFT calculations link reduced interatomic distances (below 2 Å) during ball milling to enhanced electron transfer, driving phase transformations. This work provides a sustainable and economically favorable strategy for hazardous waste valorization, highlighting a closed-loop recycling pathway with clear environmental benefits and industrial potential for spent catalyst management.

废SCR催化剂中含有有毒的砷（As）、有价的钒(V)和钨(W)，构成了双重危害和资源挑战。传统的回收方法很难在不损害载体或完全回收有价值金属的情况下选择性地去除砷。在这里，碱激活的机械化学工艺克服了这些限制，实现了99%的As去除率和97%的V回收率，同时在TiO2载体中保留了大约23.4%的W，允许直接催化剂再生。机理分析证实，naoh引发的表面TiO2溶解会导致孔隙坍塌，释放被封装的As/V物质，重建成可溶的NaAsO2/NaVO3。XRD/EPR/XPS表征证实了通过W-O键重组形成Na2WO4。DFT计算将球磨过程中原子间距离的减少（低于2 Å）与电子转移的增强联系起来，从而驱动相变。这项工作为危险废物增值提供了一个可持续的和经济上有利的战略，突出了一个闭环回收途径，具有明显的环境效益和废催化剂管理的工业潜力。

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引用次数: 0

Dietary structure transformation continues to influence the resources utilization of agricultural waste in China 饮食结构的转变持续影响着中国农业废弃物的资源化利用

IF 10.9 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Resources Conservation and Recycling

Pub Date : 2026-04-01 Epub Date: 2026-02-05 DOI: 10.1016/j.resconrec.2026.108828

Ke Pan , Bin Liu , Tingting Feng , Yang Wei , Wenjing Zhu , Qinxiang Wang

Against the backdrop of dual challenges in energy security and low-carbon transition, this study aims to comprehensively investigate the resource utilization potential of agricultural waste biomass (AWB) by proposing a dynamic “Economy-Energy-Environment” assessment framework. Focusing on the transition in Chinese residents' dietary structure, and based on demonstration plant data corresponding to four mainstream bioenergy technologies, this study analyzes the dynamic changes in the bioenergy supply chain under evolving dietary trends. By extending the Bass diffusion model to simulate the penetration effects of bioenergy technologies, the energy supply and emission reduction potential of AWB from 2023 to 2045 are evaluated. The findings reveal that: (1) The power generation cost of demonstration plants exhibits a significant positive correlation with biomass collection radius, but a negative correlation with biomass distribution density. (2) Although no fundamental shift has occurred in Chinese dietary patterns, meat demand (286.8∼304.8 kg per capita) has gradually surpassed that of grain crops (248.7∼250.2 kg per capita), resulting in an approximate 55.3% increase in livestock manure production. This growth leads to a reduction in the power generation cost of livestock manure, with a decrease ranging from –0.021 to –0.039 CNY/kWh. (3) Among the four technologies considered, Heilongjiang, Henan, and Shandong provinces demonstrate outstanding comprehensive performance, each achieving a comprehensive score above 0.7. By 2045, bioenergy deployment could reduce emissions by up to 235.4 × 10⁸ tonnes eq CO₂ while generating 7.7 PWh of electricity. These results underscore the multiple impacts of dietary transition on bioenergy technology deployment and confirm the feasibility and potential benefits of AWB-based resource utilization.

在能源安全和低碳转型的双重挑战背景下，本研究旨在通过提出一个动态的“经济-能源-环境”评价框架，全面考察农业废弃物生物质的资源利用潜力。本研究以中国居民膳食结构的转变为研究对象，以四种主流生物能源技术对应的示范工厂数据为基础，分析了饮食趋势演变下生物能源供应链的动态变化。通过扩展Bass扩散模型来模拟生物能源技术的渗透效应，评估了2023 - 2045年AWB的能源供应和减排潜力。结果表明：(1)示范电厂发电成本与生物质收集半径呈显著正相关，与生物质分布密度呈显著负相关；(2)尽管中国人的饮食模式没有发生根本性的变化，但肉类需求（人均286.8 ~ 304.8公斤）已逐渐超过粮食作物需求（人均248.7 ~ 250.2公斤），导致畜禽粪便产量增加了约55.3%。这一增长导致畜粪发电成本下降，下降幅度在-0.021元至-0.039元/千瓦时之间。(3)黑龙江省、河南省、山东省综合绩效突出，综合得分均在0.7以上。到2045年，利用生物能源可减少高达235.4 × 10⁸吨二氧化碳当量的排放，同时产生7.7千瓦时的电力。这些结果强调了饮食转变对生物能源技术部署的多重影响，并证实了基于awb的资源利用的可行性和潜在效益。

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引用次数: 0

Scaling wind power: addressing critical metals challenges and opportunities in the global energy transition to 2050 扩大风力发电规模：应对到2050年全球能源转型中的关键金属挑战和机遇