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石煤矿区酸性废水稳定同位素特征及地质意义

王晓勇, 徐友宁, 赵振宏, 兀少波, 代俊宁

王晓勇, 徐友宁, 赵振宏, 等. 石煤矿区酸性废水稳定同位素特征及地质意义[J]. 西北地质, 2023, 56(4): 162-168. DOI: 10.12401/j.nwg.2023130
引用本文: 王晓勇, 徐友宁, 赵振宏, 等. 石煤矿区酸性废水稳定同位素特征及地质意义[J]. 西北地质, 2023, 56(4): 162-168. DOI: 10.12401/j.nwg.2023130
WANG Xiaoyong, XU Youning, ZHAO Zhenhong, et al. Stable Isotope Characteristics and Geological Significance of Acid Wastewater in a Stone Coal Mining Area[J]. Northwestern Geology, 2023, 56(4): 162-168. DOI: 10.12401/j.nwg.2023130
Citation: WANG Xiaoyong, XU Youning, ZHAO Zhenhong, et al. Stable Isotope Characteristics and Geological Significance of Acid Wastewater in a Stone Coal Mining Area[J]. Northwestern Geology, 2023, 56(4): 162-168. DOI: 10.12401/j.nwg.2023130

石煤矿区酸性废水稳定同位素特征及地质意义

基金项目: 陕西省生态环境厅项目“陕西省紫阳县矿产开发伴生硫铁矿水污染场地调查”资助。
详细信息
    作者简介:

    王晓勇(1977−),男,硕士,高级工程师,从事生态水文地质及水文水资源研究。E−mail:wxiaoyong@mail.cgs.gov.cn

  • 中图分类号: P641

Stable Isotope Characteristics and Geological Significance of Acid Wastewater in a Stone Coal Mining Area

  • 摘要:

    紫阳石煤矿区水体硫酸盐浓度超标,污染日趋严重,识别硫酸盐的来源对于矿区水体硫酸盐污染防治和饮用水安全保障极为重要。笔者应用硫酸盐S、O同位素示踪矿区酸性废水对地下水的污染。紫阳石煤矿区酸性废水中硫酸根离子浓度高而pH值低,其硫酸盐S、O同位素显著富集轻同位素,表明石煤中黄铁矿开采后氧化是其产生的主要机制。通过IsoSource质量守恒模型,计算了石煤矿区酸性废水对地下水硫酸盐的贡献率约为36.5%。应用多种同位素综合识别酸性废水硫酸盐来源及其对地下水影响的定量研究提供了一种新方法,为矿山开发与生态环境保护修复提供了科学依据。

    Abstract:

    The sulfate concentration of the water body in the Ziyang stone coal mining area exceeds the standard, and the pollution is becoming more and more serious. Identifying the source of sulfate pollution is extremely important for the prevention of pollution and the guarantee of drinking water safety. The production mechanism of acid wastewater was analyzed and identified using sulfate and oxygen stable isotopes. The results show that the sulfate produced by the sulfide oxidation of stone coal was the main source of sulfate in acid wastewater. Calculated by the IsoSource mass conservation model, the contribution rate of acid wastewater to groundwater sulfate is about 36.5%. The application of multiple isotopes provides a new approach for the comprehensive identification of sulfate sources in acid wastewater and the quantitative study of its impacts on groundwater and provides a scientific basis for mine development and ecological environmental protection and restoration.

  • 图  1   石煤矿山位置及采样点分布图

    Figure  1.   The map of Stone coal mine location and sampling distribution

    图  2   酸性废水pH及SO42浓度时空分布图

    a. 蒿坪河支流pH及硫酸根分布图;b. 米溪梁pH及硫酸根分布图;c. 汉江支流pH及硫酸根分布图

    Figure  2.   Temporal–spatial distribution of pH and sulfate concentration in acidic wastewater

    图  3   石煤矿区水体pH及SO42–浓度时空分布图

    a. 蒿坪河支流河水pH及硫酸根分布图;b. 汉江支流河水pH及硫酸根分布图

    Figure  3.   Spatial–temporal distribution of water pH and sulfate concentration in stone coal mining area

    图  4   石煤矿区水体H–O同位素组成关系图

    Figure  4.   Relationship diagram of hydrogen and oxygen isotope composition of water in stone coal mining area

    图  5   地下水硫酸盐氧化时空特征图

    Figure  5.   Spatio–temporal characteristics of groundwater sulfate oxidation

    图  6   研究区水体硫酸盐同位素分布特征

    Figure  6.   Distribution characteristics of sulfate isotope in water body in the study area

    表  1   紫阳石煤矿区水样化学组成及同位素组成

    Table  1   The chemical and isotope composition of water samples in Ziyang stone coal mining area

    样品编号取样点位置样品类型pHSO42−(mg/L)δ18O (‰)δ34S (‰)δD (‰)δ18O (‰)
    ZK-1废渣坝地下水3.143870−3.1812.62−53.11−10.05
    D001米溪梁地表水2.32550−3.4214.14−61.05−9.88
    D002米溪梁地表水2.63336.72.8211.30−51.51−8.45
    D004米溪梁地表水36963−4.2114.55−61.07−9.92
    D005米溪梁地表水2.784450−3.738.21−60.80−9.85
    D006米溪梁地表水2.663560−4.487.50−60.51−9.74
    D007米溪梁地表水2.93920−4.0413.61−61.09−9.76
    D008米溪梁地表水3.9136500.9610.80−59.79−9.51
    D009米溪梁地表水3.533210−2.5411.97−61.33−9.69
    D010米溪梁地表水3.252650−3.349.39−60.90−9.59
    D011米溪梁矿坑水2.793117−3.1613.17−60.53−9.79
    D012米溪梁矿坑水3.33200−3.2513.13−59.60−9.65
    D013米溪梁矿坑水3.712160−2.3412.22−58.94−9.46
    D014米溪梁矿坑水3.52870−2.4412.14−58.63−9.39
    D015米溪梁矿坑水5.12020−3.338.68−59.60−9.55
    D016米溪梁矿坑水4.072940−2.9312.69−58.05−9.22
    D017米溪梁地下水3.72250−4.867.83−58.45−9.34
    D018米溪梁地下水4.192970−2.697.63−60.62−9.55
    D019米溪梁地下水3.414440−2.8111.42−60.21−9.42
    D021米溪梁矿坑水3.33710−3.347.23−58.54−9.68
    D022米溪梁矿坑水3.654110−2.877.08−58.70−9.67
    D023米溪梁矿坑水5.7235307.419.36−63.17−10.13
    D024米溪梁地下水5.63640−1.45−5.97−61.30−9.85
    D025大磨沟地表水6.0559.9−1.465.13−62.01−9.85
    下载: 导出CSV
    续表1
    样品编号取样点位置样品类型pHSO42−(mg/L)δ18O (‰)δ34S (‰)δD (‰)δ18O (‰)
    D026大磨沟矿坑水//−2.044.50−58.14−9.31
    D027小磨沟矿坑水4.262235.2812.62−60.96−9.80
    D028小磨沟地表水6.2425.8−3.1311.72−62.66−9.81
    D029小米溪沟地下水5.95254−0.11−2.20−61.57−9.97
    D030月池沟地表水4.161500−3.8913.04−59.60−9.72
    D031月池沟地表水//−0.8011.30−61.21−9.96
    D032小米溪沟地表水3.143870−3.1711.89−58.30−9.54
    D033小米溪沟地表水3.1833208.1711.84−60.79−9.87
    D037铁炉沟地表水6.34140−0.388.30−67.33−10.78
    D038铁炉沟地表水6.5269.7−3.807.40−63.44−10.05
    YS01蒿坪镇大气降水6.19319//−10.44−4.30
    YS02陈家沟雨水6.67305//−9.21−4.17
    YS03陈家沟雨水5.7114//−10.46−4.54
    YS04陈家沟雨水6.0949.1//−15.09−5.17
    YS05大米溪沟雨水3.34319//−20.76−5.97
    YS06大米溪沟雨水7.1929.7//−23.18−6.46
    YS07大米溪沟雨水4.81113//−23.78−6.42
    YS08大米溪沟雨水 ////−20.56−5.97
    下载: 导出CSV

    表  2   不同来源硫酸盐含量及同位素组成

    Table  2   Sulphate content and isotopic composition of different sources

    类型$ \delta {}^{34}{{\text{S}}_{S{O_4}}} $$ \delta {}^{18}{{\text{O}}_{S{O_4}}} $备注
    降雨−3~+9+7~+17顾慰祖,2011
    邱述兰,2012
    肥料10.5±9.26.7±5.5Laura et al.,2004
    硫化物<+18<+5Qibo et al.,2016
    石膏(蒸发岩)+15~+25+15~+20顾慰祖等,2000
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-01-05
  • 修回日期:  2023-07-05
  • 网络出版日期:  2023-07-17
  • 刊出日期:  2023-08-19

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