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Resources, Conservation and Recycling
Pergamon
Resources, Conservation and Recycling

Pergamon

0921-3449

Resources, Conservation and Recycling/Journal Resources, Conservation and RecyclingEI
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    Reinforced urban waste management for resource, energy and environmental benefits: China's regional potentials

    Song, JunnianFeng, RunchuanYue, ChunlinShao, Yixuan...
    11页
    查看更多>>摘要：Urban waste management is a huge task for achieving regional sustainability. Reinforced waste management is being expedited to achieve enhanced resource, energy and environmental benefits (REEBs). In this study, an integrated municipal solid waste management system focusing on reinforced waste recycling and energy re-covery is constructed. Considering regional disparities in waste composition and suitability for waste recycling, three scenarios with moderate, strengthened and complete waste collection and recycling levels are designed. Targeting 31 Chinese provincial regions, resource recovery potentials from recyclables, energy recovery po-tentials from incineration and anaerobic digestion, and mitigated environmental impact potentials in four aspects are evaluated. The results indicate that in 2019, the complete resource recovery capacity is 60.25 million tons (metal 4.3%, rubber & plastic 47.7%, glass 10.0% and paper 38.0%). Through incineration and anaerobic digestion, total power generation could amount to 36.39 billion kWh in the complete scenario. The complete mitigated potentials of global warming (52.5%) and eutrophication (43.1%) are much larger, followed by that of acidification (3.6%) and photochemical oxidization (0.8%). Guangdong, Jiangsu, Shandong, Zhejiang and Sichuan are more advantageous in terms of the REEBs. The novelty of this study lies in the elaborative assessment of the integrative benefits of reinforced waste management incorporating regional socioeconomic disparities. The results are expected to offer help in policy making targeting sounder performance on REEBs from waste management.
      原文链接:
    • NSTL
    • Elsevier

    Assessing the impact of electricity consumption on water resources in the U. S.

    Wemhoff, Aaron P.Chen, Li
    9页
    查看更多>>摘要：Electricity generation heavily relies on water. Growing electricity demand globally inevitably leads to water availability concerns. This study proposes a means to quantify the indirect water usage embodied in electricity and assesses the holistic impact of water consumption on available water resources. First, the energy water intensity factor (EWIF), which quantifies the amount of water used to produce energy, is updated at the contiguous U.S. balancing authority (BA) level and on an end user basis to account for electricity trades using an input-output model. Further, the scarce water index (SWI), or volume of scarce water embodied per kWh electricity consumed, is proposed to predict electricity consuming facility water stress impact as the water scarcity footprint (WSF). A case study of U.S. data centers is presented to demonstrate the use of these metrics. Results show that WSF is region-dependent, and the burden of regional water scarcity extends beyond region boundaries.
      原文链接:
    • NSTL
    • Elsevier

    Separation of lithium, nickel, manganese, and cobalt from waste lithium-ion batteries using electrodialysis

    Chan, Ka HoMalik, MonuAzimi, Gisele
    11页
    查看更多>>摘要：With the expansion of lithium-ion battery market and the awareness of environmental protection, the development of green and sustainable technologies to recycle waste lithium-ion batteries has become urgent. Electrodialysis is an emerging green process to recover valuable metals from postconsumer lithium-ion batteries. This study focuses on the separation and recovery of lithium, nickel, manganese, and cobalt from LiNi0.33Mn0.33-Co0.33O2 chemistry of lithium-ion batteries using electrodialysis. Prior to the electrodialysis experiment, complexation of ethylenediaminetetraacetic acid (EDTA) with four different metals is assessed using ultraviolet-visible spectroscopy. Using the developed three-stage electrodialysis process, 99.3% of nickel is separated in stage 1 and 87.3% of cobalt is then separated in stage 2 using electrodialysis coupled with EDTA. About 99% of lithium is sequentially separated from manganese in stage 3 using electrodialysis with a monovalent cation-exchange membrane. After the electrodialysis experiment, nickel and cobalt are decomplexed from EDTA at pH below 0.5 and all four metals are recovered with high purity of >99%. Electrodialysis offers a new route to recycle lithium-ion batteries with twofold benefits of providing a secondary source for strategic materials and reducing the number of lithium-ion batteries that are landfilled after they reach their end of life.
      原文链接:
    • NSTL
    • Elsevier

    An urban hierarchy-based approach integrating ecosystem services into multiscale sustainable land use planning: The case of China

    Sun, XiaoWu, JianguoTang, HuajunYang, Peng...
    14页
    查看更多>>摘要：Understanding how to manage ecosystem services (ESs) is crucial for sustainable regional development. The multiscale ES assessment can provide a new perspective for land use planning. We assessed the spatiotemporal patterns of multiple ESs in the three largest urban agglomerations of China at different levels: Bei-jing-Tianjin-Hebei, the Yangtze River Delta, and the Pearl River Delta from 1980 to 2018. The urban hierarchy extends from the city proper to metropolitan regions and then urban agglomeration levels. Associating with the trade-off relationships and influencing factors of ESs, a new methodological framework was proposed to enhance the ESs by developing improved land use scenarios at different urban hierarchical levels. The major results showed that: (1) the spatiotemporal patterns of ESs varied at different levels and not all ESs increased with increasing spatial scales; (2) the ES relationships at small scales did not apply to the broader scales and even led to diametrically opposing outcomes; (3) socioeconomic factors were the main drivers at the low level, whereas natural factors became the main drivers at the high level; and (4) more sustainable policy-combination scenarios were also place-based and scale-dependent, for example, strengthening intensive utilization of developed lands at the city proper level, implementing agroforestry intercropping at the metropolitan level, and facilitating forest conservation practices at the urban agglomeration level. It indicated that a multiscale approach should be considered when managing ESs. The scale-explicit land use strategies can help decision makers and planners to enhance the ESs and landscape sustainability more effectively and avoid misleading guidance.
      原文链接:
    • NSTL
    • Elsevier

    A green and efficient route for simultaneous recovery of low valence of vanadium and chromium, titanium and iron from vanadium slag

    Wang, ZhenghaoChen, LiangQin, ZhifengYang, Ke...
    14页
    查看更多>>摘要：Traditional methods to recover vanadium from vanadium slag by oxidizing V(III) in slag to V(V) at above 800 degrees C, result in discharge of significant amount of residue containing Cr, Ti, Fe, and wastewater containing highly toxic V(V) and Cr(VI). Then V2O5 was reduced to low valence vanadium (LVV) for applications, such as vanadium flow battery, vanadium alloy. It is necessary to effectively utilize vanadium slag for the sustainable development of vanadium metallurgy industry. In present work, a clean method was developed to directly recover LVV from vanadium slag and valuable elements such as Cr, Ti, Fe were retrieved simultaneously, without producing V(V) and Cr(VI) bearing hazardous wastewater and residue. Vanadium slag was roasted with sulfuric acid under low temperature and then leached with water, while the volatile roasting tail gas was stripped with water. During the roasting, metal ions, V(III), Cr(III), Fe(II), Ti(IV) converted to their corresponding sulfates subsequently leached out into the leachate. Almost all of vanadium and chromium retained in the form of low valence during the process. By optimizing the roasting-leaching conditions, the best recovery of V, Cr, Ti, Fe reached 96.20%, 94.39%, 90.60%, 90.13%, respectively. This low temperature roasting process provides a new mute to recover useful elements from vanadium slag without discharging wastes, it is an environmentally benign and clean technology.
      原文链接:
    • NSTL
    • Elsevier

    From social interactions to private environmental behaviours: The case of consumer food waste (vol 176, 105952, 2022)

    Piras, SimoneRighi, SimoneSetti, MarcoKoseoglu, Nazli...
    5页
      原文链接:
    • NSTL
    • Elsevier

    China should focus beyond access to toilets to tap into the full potential of its Rural Toilet Revolution

    Prithvi, Prithvi SimhaPerez-Mercado, Luis FernandoBarton, Melissa A.Lyu, Yaping...
    10页
    查看更多>>摘要：In China, over 47 million toilets in rural areas have been upgraded since the nationwide sanitation program, popularly referred to as the "toilet revolution", was launched in 2015. However, little is known about the perceptions of rural households regarding these new toilets or the fate of human excreta collected using them. To investigate the other side of the toilet revolution, we surveyed 980 rural households from 22 provinces across China in 2020. We found that most households used an on-site sanitation system (i.e. septic tanks and pit latrines), where urine and feces were mixed and collected (88%), stored in pits or tanks (79%), emptied by the households themselves (60%), applied on farmland as fertilizer (45%), or used for biogas production (5%). Despite the toilet revolution-driven infrastructure upgrade, only 25% of the households were satisfied with their sanitation system and pointed to health risks from issues in the toilet interface and the treatment and reuse of excreta as areas of concern. The majority preferred an "out of sight, out of mind" approach, in which the local government handles excreta without involving the households and without asking them to pay for such management. Meanwhile, 80% supported the idea of local nutrient recycling and believed that human excreta should return to farmland as fertilizer or used for biogas production. Our findings suggest that decision makers in local governments across China must urgently explore ways to upgrade all parts of the sanitation service chain so that rural sanitation can be truly improved to positively influence the progress on other national sustainability goals.
      原文链接:
    • NSTL
    • Elsevier

    Pyrometallurgy coupling bioleaching for recycling of waste printed circuit boards

    Chu, HuichaoQian, CanTian, BingyangQi, Shiyue...
    10页
    查看更多>>摘要：The pyrometallurgy coupling indirect bioleaching strategy is proposed for the recycling of WPCBs to avoid the disadvantages of time-consuming, low processing power, and relatively low efficiency of conventional bioleaching. The results show that under the pulp density of 2.5% (w/v), the low content (0.26 wt.%) of Ni in the raw WPCBs is completely extracted by indirect bioleaching, while the release rate of a high content (24.52 wt.%) of Cu is only 46.9%. However, the calcination pretreatment significantly improves Cu release by indirect bioleaching, and 100% Cu extraction is attained from the 600 degrees C-treated WPCBs at the high pulp density of 5.0% due to the formation of tractable CuO. Conversely, the release of Ni is inhibited by calcination evidently, and the indirect bioleaching efficiency of Ni declines from 34.9% to 10.1% when the pulp density lifts from 2.5% to 10.0% because of the formation of NiO with lower kinetics of acid-dissolution. On the other hand, due to the complete removal of Cu and the formation of insoluble NiO, the toxicity and environmental risk analysis indicates that the bioleaching residue of the 600 degrees C-treated WPCBs at the pulp density of 5.0% is completely detoxified and can be reused as non-hazardous materials safely, while the combination of the calcination and indirect bioleaching significantly reduces the environmental risk associated with the WPCBs. These findings provide the theoretical basis for a perfect combined process of pyrometallurgy and bioleaching for tackling the WPCBs from a technological perspective.
      原文链接:
    • NSTL
    • Elsevier

    Pyrometallurgical processing of ferrous slag "co-product" zero waste full utilization: A critical review

    Yang, JianFirsbach, FelixSohn, Il
    23页
    查看更多>>摘要：The inherent occurrence of slag "co-products" and its utilization during ferrous production are crucial for the industry to ensure greater sustainability. In this work, various research and technological developments to enhance the utilization of ferrous slag co-products and retrieval of thermal energy are reviewed. Ironmaking slag can be utilized as a substitute for cementitious additives or aggregates for construction use. Steelmaking slag contains significant amounts of FetO, MnO and possibly toxic metal oxides, making them difficult for greater utilization. To minimize the ecological hazards and retrieve the value of steelmaking slag, proper treatments are necessary, including reductions of f-CaO (free lime), gamma-Ca2SiO4, FeO, and stabilization of toxic metallic elements. In addition, a large amount of under-utilized thermal energy is present within the high-temperature slag but yet to be recovered. To save the thermal energy and retain the added value of slag, dry granulation could be an attractive and eco-friendly option. Among all the possible methods, centrifugal granulation is most economically and environmental beneficial, which is on the edge of industrialization with the potential to integrate with highgrade thermal energy recovery. Compared with the traditional heat carriers, the heat exchange and storage using thermochemical methods through endothermic reactions provides a potential for higher energy density and added values which is yet limited by the reaction kinetics. This work is expected to gain a thorough understanding of ferrous slag and shed light upon the future perspectives of zero waste concept, relieving the environmental burdens for the carbon neutral society in 2050.
      原文链接:
    • NSTL
    • Elsevier

    Atomic H* enhanced electrochemical recovery towards high-value-added metallic Sb from complex mine flotation wastewater

    Yang, LimingYi, GenpingWang, BoShao, Penghui...
    10页
    查看更多>>摘要：Simultaneous recovery and value-added conversion of hazardous heavy metal ions from complex wastewater sources is of great significance yet challenging. Herein, we demonstrate that highly toxic antimonite Sb(III) could be effectively recovered from antimony (Sb) mine flotation wastewater and converted into high-value-added metallic Sb using a novel facile atomic H* enhanced electrochemical reduction avenue coupled with thermal reduction by H-2 gas. The high production of atomic H* generated from the electrochemical cathode with an optimum reduction potential of -1.2 V vs. Ag/AgCl, which is lower than the Sb(III) reduction potential of -1.0 V, might be attributable to the superior Sb recovery capabilities. Furthermore, the metallic Sb concentration at -1.2 V was 14.43 times greater than at -1.0 V due to the strong reductivity of atomic H*. In addition, Sb(III) removal efficiency was found to be as high as 98.52%, with a metallic Sb recovery rate of up to 1.67 mg min(-1). The efficiency of Sb(III) recovery was demonstrated throughout a wide pH range, with metallic Sb being the main product, independent of the presence of multiple coexisting ions. Economic analysis also indicated that treating Sb mine flotation wastewater per ton may yield a net profit of $40.09. This research contributes to the advancement of an atomic H* enhanced electrochemical technology for high-valued heavy metal recovery from complex heavy metal-polluted wastewater.
      原文链接:
    • NSTL
    • Elsevier