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为评价利用富含天然水溶性有机质的废水覆盖处理对含硫煤矸石污染物释放的原位控制效果,分别采用过滤后的沼液覆盖(水溶性有机质1,OC-1)、养殖废水覆盖(水溶性有机质2,OC-2)及清洁水源水覆盖(对照,CK)对煤矸石进行浸没(覆盖)处理。经550 d的连续浸没试验,结果表明:与对照相比,煤矸石在2种天然水溶性有机质覆盖处理后的550 d的内,均能显著抑制煤矸石的氧化产酸,使水溶性有机质处理后上覆水样的pH一直维持中性偏碱的水平,显著降低了煤矸石周边水环境的氧化还原电位(pOC-1=0.000 01;pOC-2=0.000 01),并显著降低了煤矸石上覆水样中Fe、Mn、Cu、Zn及SO42-和F-等阴阳离子的浓度(pOC-1均<0.01;pOC-2也均<0.01);且2种水溶性有机质覆盖上覆水样中的溶出离子浓度之间没有显著性差异(pEC=0.251 5、pEh=0.319 8、pFe=0.992 8、pMn=1、pCu=0.939 7、pZn=0.993 1、pSO42-=0.124、pF-=0.073 8)。而清洁水源水(对照)处理的上覆水样则呈现煤矿山酸性废水的典型特征,即较低的pH(2.52)、较高的EC(3 730μS/cm)、Eh(502 mV)和酸度(1 383 mg/L),同时富含Fe、Mn、Cu、Zn等金属离子及SO42-和F-等阴离子。说明天然水溶性有机质覆盖处理可有效抑制含硫煤矸石的氧化酸化及多种特征污染物质的溶出释放。因此,可考虑采用一定浓度的养殖废水及沼液等天然水溶性有机质作为煤矸石覆盖材料对含硫煤矸石进行原位污染控制及治理。
In order to evaluate the in situ control effect of the release of pollutants containing sulfurous coal gangue by the treatment of waste water with natural water-soluble organic matter, the filtered biogas slurry was used to cover (water-soluble organic matter 1 and OC-1) Water-soluble organic matter 2, OC-2) and clean water coverage (control, CK) on the gangue immersion (cover) treatment. After 550 days of continuous immersion test, the results showed that compared with the control, the coal gangue could significantly inhibit the oxidation and acid production of the coal gangue within 550 days after the two kinds of natural water-soluble organic matter were covered and the water-soluble organic matter The pH of the overlying water sample maintained the neutral alkali level and significantly reduced the redox potential (pOC-1 = 0.000 01; pOC-2 = 0.000 01) of the water environment around the gangue and significantly reduced the gangue content The concentrations of Fe, Mn, Cu, Zn, SO42- and F- in the overlying water samples (pOC-1 <0.01; pOC-2 also all <0.01); and two kinds of water- There was no significant difference between the concentrations of dissolved ions in the samples (pEC = 0.251 5, pEh = 0.319 8, pFe = 0.992 8, pMn = 1, pCu = 0.939 7, pZn = 0.993 1, pSO42- = 0.124, pF- = 0.073 8). However, the overlying water samples treated with clean water (control) showed the typical characteristics of acidic wastewater in coal mines, ie lower pH (2.52), higher EC (3 730 μS / cm), Eh (502 mV) and acidity (1 383 mg / L), while rich in Fe, Mn, Cu, Zn and other metal ions and SO42- and F- anions. The results showed that the treatment of natural water-soluble organic matter could effectively inhibit the oxidation and acidification of sulfur-containing coal gangue and the dissolution and release of various pollutants. Therefore, we can consider the use of a certain concentration of aquaculture wastewater and biogas slurry and other natural water-soluble organic matter as coal gangue cover material for sulfur-containing gangue in situ pollution control and control.