不同类型伴随阴离子钙盐对风化煤矸石污染物释放的影响
发布时间：2018-09-05 18:19
【摘要】：在岩溶地区煤矿山污染修复过程中,钙盐在风化的酸性煤矸石污染物质控制方面发挥着至关重要的作用,为评价不同类型伴随阴离子钙盐对风化煤矸石中特征污染组分释放影响,通过在风化煤矸石中添加等摩尔比(以钙计)的CaCO_3、Ca_3(PO_4)_2、CaC_2O_4、CaSO_4、CaCl_2、Ca(NO_3)26种钙盐并稳定7 d后,考察了浸出液的pH、EC、Eh及Fe、Mn、Cu、Zn和SO_4~(2-)等特征污染物。结果表明:CaCO_3、Ca_3(PO_4)_2能有效缓冲煤矸石的酸度,明显提高了体系的pH,极显著(p0.001)抑制风化煤矸石中特征污染组分的溶出释放;CaC_2O_4能显著提高煤矸石浸出液的pH,降低浸出液EC、Eh及Mn、Cu、Zn和SO_4~(2-)的含量,但草酸根的存在明显促进亚铁和总铁的释放;CaSO_4一定程度上会抑制Fe、Mn、Cu的释放,但会提高浸出液中Zn、SO_4~(2-)的含量,总体上对各污染组分的影响作用不显著;呈中性的强酸强碱盐CaCl_2、Ca(NO_3)_2由于离子竞争作用及Ca~(2+)形成复合物-石膏沉淀作用能显著(p0.05)抑制SO_4~(2-)的溶出,但在一定程度上可降低浸出液的pH、提高浸出液的EC及Zn离子浓度,而对其他污染组分影响作用相对较小,故建议在煤矿山污染修复过程中需谨慎使用或引入此类物质。综上,不同类型伴随阴离子的钙盐对风化煤矸石中pH、EC、Fe、Mn、SO_4~(2-)及重金属等多种特征污染组分的释放存在显著差异,影响着风化煤矸石在环境中的潜在污染风险和修复材料的污染控制效果。
[Abstract]:In the process of remediation of coal mine pollution in karst area, calcium salt plays an important role in the control of weathered acidic coal gangue pollutants. In order to evaluate the effect of different types of anionic calcium salts on the release of characteristic contaminants from weathered gangue, 26 calcium salts were added to weathered gangue by adding CaCO_3,Ca_3 (PO_4) of equal molar ratio (in calcium) to the weathered gangue. After 7 days of stabilization, 26 calcium salts were added to the weathered gangue. The characteristic pollutants such as pH,EC,Eh, Fe,Mn,Cu,Zn and SO_4~ (2 -) in the leachate were investigated. The results showed that PO_4 could effectively buffer the acidity of coal gangue, and the pH, of the system could significantly inhibit the dissolution and release of characteristic pollutants in weathered gangue. CaC2O4 could significantly increase the contents of pH, Mn,Cu,Zn and SO_4~ (2-) in the leachate of coal gangue. However, the presence of oxalate can obviously promote the release of ferrous and total iron. CaSO4 can inhibit the release of Fe,Mn,Cu to some extent, but increase the content of Zn,SO_4~ (2-) in the leachate. CaCl_2,Ca (NO_3) 2, a neutral strong acid and strong base salt, could significantly inhibit the dissolution of SO_4~ (2-) because of the action of ion competition and Ca~ (2) formation complex-gypsum precipitation, but to a certain extent, it could decrease the pH, of leaching solution and increase the concentration of EC and Zn ions. However, the effect on other pollution components is relatively small, so it is suggested that this kind of substances should be used or introduced carefully in the process of pollution remediation in coal mines. In conclusion, there are significant differences in the release of pH,EC,Fe,Mn,SO_4~ _ (2-) and heavy metals in the weathered coal gangue by different types of calcium salts accompanied by anions. It affects the potential pollution risk of weathered coal gangue in the environment and the pollution control effect of remediation materials.
【作者单位】： 贵州大学资源与环境工程学院;贵州大学应用生态研究所;贵州大学新农村发展研究院;
【基金】：国家自然科学基金资助项目(41663009) 贵州省教育厅自然科学研究项目(黔教合KY字[2016]011);贵州省教育厅研究生教育创新计划项目(黔教研合GZZ字[2016]07) 贵阳国家高新区高层次人才创新创业项目(GYGC(2015)-0035)
【分类号】：X752
，
本文编号：2225076
[Abstract]:In the process of remediation of coal mine pollution in karst area, calcium salt plays an important role in the control of weathered acidic coal gangue pollutants. In order to evaluate the effect of different types of anionic calcium salts on the release of characteristic contaminants from weathered gangue, 26 calcium salts were added to weathered gangue by adding CaCO_3,Ca_3 (PO_4) of equal molar ratio (in calcium) to the weathered gangue. After 7 days of stabilization, 26 calcium salts were added to the weathered gangue. The characteristic pollutants such as pH,EC,Eh, Fe,Mn,Cu,Zn and SO_4~ (2 -) in the leachate were investigated. The results showed that PO_4 could effectively buffer the acidity of coal gangue, and the pH, of the system could significantly inhibit the dissolution and release of characteristic pollutants in weathered gangue. CaC2O4 could significantly increase the contents of pH, Mn,Cu,Zn and SO_4~ (2-) in the leachate of coal gangue. However, the presence of oxalate can obviously promote the release of ferrous and total iron. CaSO4 can inhibit the release of Fe,Mn,Cu to some extent, but increase the content of Zn,SO_4~ (2-) in the leachate. CaCl_2,Ca (NO_3) 2, a neutral strong acid and strong base salt, could significantly inhibit the dissolution of SO_4~ (2-) because of the action of ion competition and Ca~ (2) formation complex-gypsum precipitation, but to a certain extent, it could decrease the pH, of leaching solution and increase the concentration of EC and Zn ions. However, the effect on other pollution components is relatively small, so it is suggested that this kind of substances should be used or introduced carefully in the process of pollution remediation in coal mines. In conclusion, there are significant differences in the release of pH,EC,Fe,Mn,SO_4~ _ (2-) and heavy metals in the weathered coal gangue by different types of calcium salts accompanied by anions. It affects the potential pollution risk of weathered coal gangue in the environment and the pollution control effect of remediation materials.
【作者单位】： 贵州大学资源与环境工程学院;贵州大学应用生态研究所;贵州大学新农村发展研究院;
【基金】：国家自然科学基金资助项目(41663009) 贵州省教育厅自然科学研究项目(黔教合KY字[2016]011);贵州省教育厅研究生教育创新计划项目(黔教研合GZZ字[2016]07) 贵阳国家高新区高层次人才创新创业项目(GYGC(2015)-0035)
【分类号】：X752
，
本文编号：2225076
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