一种评估在废物收集中心暴露于降雨事件的金属和电子废物中金属释放的方法学方法

IF 7.7 Q2 ENGINEERING, ENVIRONMENTAL
Vanessa Canaletti, Alessandro Bonetto, Andrea Brunelli, Elena Semenzin, Loris Calgaro, Cinzia Bettiol, Antonio Marcomini, Elena Badetti
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引用次数: 0

摘要

金属废物和电子废物的处置如果不妥善完成,可能导致有毒金属释放到土壤和地表水中,对环境健康构成风险。金属浸出的程度取决于废物管理做法,包括储存条件。面对这个问题,我们开发了一种结合现场和实验室调查的方法,以支持收集中心的管理策略,在收集中心,废物储存在开顶容器中,因此暴露在降雨中。具体而言,在几个中心的降雨事件后收集了渗滤液样本并进行了分析。为了解释在现场条件下观察到的可变性,还建立了一个实验室规模的实验,将MW和EW暴露于模拟降雨事件中,包括第一次冲洗15分钟,然后再冲洗15分钟,将废物浸泡在容器中积累的水中长达14天(后期阶段)。定期渗滤液分析显示,尽管MW中某些金属的释放量较高(铝、铁和锌分别高达13.4、10.9和47.9毫克/升),但由于镉、镍和铅等有害金属的大量释放(分别高达0.5、0.3和1.7毫克/升),E-W引起了更大的关注。观察到不同废物类型的释放模式不同,特别是在第一次冲洗期间。后期积累的水显示有害金属浓度增加或达到峰值,强调长时间浸泡的影响。这些发现突出了废物管理的关键因素,以减轻对环境的影响,包括储存时间和在排放到环境中之前对产生的废水进行监测/处理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A methodological approach to assess the release of metals from metallic- and electronic-wastes exposed to rainfall events in waste collection centers
The disposal of metallic (MW) and electronic (E-W) waste, if not properly accomplished, can lead to the release of toxic metals to soil and surface water, posing risks to environmental health. The extent of metal leaching depends on waste management practices, including storage conditions. Facing this issue, we developed a methodological approach combining field and laboratory investigations to support management strategies in collection centers where wastes are stored in open-top containers and thus exposed to rainfall.
Specifically, leachate samples were collected after rainfall events at several centers and analysed. To account for variability observed in field conditions, a laboratory-scale experiment was also set up, with MW and EW exposed to simulated rainfall events, including a 15-minute first flush, followed by further 15 min, with waste immersion up to 14 days in water accumulated in the containers (later stage). Periodical leachate analysis revealed that, despite a higher release of certain metals from MW (up to 13.4, 10.9 and 47.9 mg/L for aluminium, iron, and zinc, respectively), E-W posed greater concern due to a significant release of hazardous metals such as cadmium, nickel and lead (up to 0.5, 0.3 and 1.7 mg/L, respectively). Different release patterns between waste types were observed, particularly during the first flush. Water accumulated during the later stage showed increasing or peak concentrations of hazardous metals, stressing the influence of prolonged immersion. These findings highlighted critical factors in waste management to mitigate environmental impact, including storage time and monitoring/treatment of the resulting wastewater before discharge into the environment.
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来源期刊
Journal of hazardous materials advances
Journal of hazardous materials advances Environmental Engineering
CiteScore
4.80
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