煤矸石在动态淋滤作用下污染物释放规律研究  

Regularity of pollutant release from coal gangue under dynamic leaching operation

作　　者：梁冰[1] 肖利萍[2] 陆海军[1] 毕业武[1] 张传成[1] 狄军贞[2] 

机构地区：[1]辽宁工程技术大学力学系,辽宁阜新123000 [2]辽宁工程技术大学土木建筑工程学院,辽宁阜新123000

出　　处：《水利水电科技进展》2006年第4期27-30,共4页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金资助项目(50374041)

摘　　要：对新邱露天矿不同风化程度的煤矸石溶解释放污染物的规律进行了动态淋滤实验研究，结果表明：煤矸石溶解释放的主要污染组分为总硬度（以CaCO3计）、SO4^2=，Na^＋，TDS，F^-，CODMn和总Fe等，淋滤液pH值基本在6．6～7．0之间，Cl^-，Mn，Zn等少量，其他重金属和As等微量；煤矸石风化程度越高，溶解释放的无机盐类污染物量越多，新鲜混合煤矸石溶解释放出较高的F^-，CODMn和总Fe；淋滤初期，淋滤液中主要污染组分质量浓度较高，溶出速率也较快；尤其是Na^＋溶解释放速率更快，以后随着降水量的增加，煤矸石中的污染物逐渐被降雨淋滤水量带走，淋滤液中各污染物质量浓度逐渐降低，煤矸石中污染物的淋溶释放呈指数曲线规律衰减；利用该衰减规律可定量预测煤矸石中污染物对土壤和地下水污染的强度。Dynamic leaching experiments were carried out for study of the regularity of pollutant dissolution and release from coal gangue in Xinqiu open pit mine under different weathering degrees. Some conclusions were drawn： the main pollutant components released from coal gangue are the total hardness （reflected by CaC03）, SO4^2- , Na^＋ , rIDS, F^- , CODu,, total Fe, etc. , the pH value of leaching liquid is in the range of 6.6 - 7.0, and there are still small amounts of Cl^- , Mn and Zn, and minim of other heavy metals and As ; the higher the weathering degree of coal gangue, the more the inorganic salt pollutants dissolved out of and released from coal gangue, and fresh mixed coal gangue releases high amounts of F^- , CODMn. and total Fe; at the early stage of leaching operation, the concentration of main pollutant components is relatively high, and the pollutants are rapidly dissolved and released, especially for Na^＋ ; with increase of rainfall, pollutants in coal gangue are gradually washed away by rain water, the concentration of pollutants reduces in leaching liquid, and the amounts of pollutants released from coal gangue are attenuated in a negative exponential law; moreover, the attenuation law can be applied to predicting the intensity of soil and groundwater pollution induced by pollutants in coal gangue.

关 键 词：煤矸石 动态淋滤 污染物溶解 污染物释放规律 

分 类 号：X752[环境科学与工程—环境工程]