An attempt to study the photoreduction rate of divalent mercury in landfill cover soils using experimental control systems

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Waste management Pub Date : 2025-03-01 DOI:10.1016/j.wasman.2025.02.041

Zhengkai Tao , Yiqing Fan , Qingyun Zhang , Dayong Xu

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Abstract

Mercury (Hg) emissions from landfill cover soils are an important source of atmospheric Hg affecting local and regional atmospheric Hg budget. To date, soil Hg emissions have been extensively studied, whereas the photoreduction rate of cover soil Hg(II) under various conditions is rarely studied. Herein, two experimental control systems were built to investigate the effect of varying soil Hg(II) concentrations, moistures, and temperature on soil Hg emission in order to obtain the photoreduction rate of soil Hg(II) under varying environmental conditions. The results showed that high soil Hg(II) concentration and high soil temperature can facilitate Hg emission; however, high moisture inhibited Hg emission. In addition, solar radiation is an extremely critical factor for Hg emission and solar radiation-driven photoreduction is an important contribution process for Hg emission; moreover, soil Hg emission is controlled by multiple environmental factors and varies with environmental factors. Through the data fitting and formula calculation, the photoreduction rates under varying conditions are in the range of 1.49–8.54 × 10⁻¹⁰ m² s⁻¹ W⁻¹, which can be helpful for the construction of a process-based model of soil Hg emission and Hg management in landfills.

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利用实验控制系统研究垃圾填埋场覆盖土壤中二价汞的光还原速率

垃圾填埋场覆盖土壤的汞排放是影响当地和区域大气汞收支的重要来源。迄今为止，人们对土壤汞的排放进行了广泛的研究，而对不同条件下覆盖土壤汞（II）的光还原速率的研究却很少。为了得到不同环境条件下土壤Hg（II）的光还原速率，建立了两个实验控制系统，研究了不同土壤Hg（II）浓度、湿度和温度对土壤Hg（II）排放的影响。结果表明：高土壤Hg（II）浓度和高土壤温度有利于汞的排放；高湿度抑制了汞的释放。此外，太阳辐射是汞排放的一个极其关键的因素，太阳辐射驱动的光还原是汞排放的重要贡献过程；土壤汞排放受多种环境因子控制，并随环境因子的变化而变化。通过数据拟合和公式计算，不同条件下的光还原速率在1.49 ~ 8.54 × 10−10 m2 s−1 W−1范围内，可为基于过程的填埋场土壤汞排放和汞管理模型的构建提供依据。

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)