锰包覆羟基磷灰岩去除高砷酸矿水及Matlab迁移数值模拟
发布时间：2018-10-21 17:19
【摘要】：酸矿废水中砷来自砷硫化物的氧化释放,它们导致地表和地下水出现高砷,对环境和当地人类造成威胁。本文采用羟基磷灰岩和砷(V)分别作为碱性介质和污染物。通过在骨炭表面建立不同程度的锰包覆层,开展包覆层对吸附行为的调查。采用柱实验调查砷(V)在骨炭中的迁移行为,并建立起相应的滞留能力与包覆层发育之间的定量关系。开展五因素三水平27组析因实验,调查Fe、Al、Mn三种常见阳离子对砷迁移行为影响。并运用Matlab软件进行迁移数值模拟。主要研究结果如下:(1)锰包覆层可以有效地提高骨炭对砷(V)的吸附能力,并且吸附量是新鲜骨炭的78倍。(2)在相同的解吸条件下,锰包覆层比新鲜骨炭能够固定更多的砷(V)。各种锰包覆骨炭解吸砷的比例是吸附砷的量的0.02-0.6%,这优于新鲜骨炭(30%)。在锰包覆量高的骨炭(B5,B6和B7)发现两个解吸过程。(3)骨炭对砷的滞留能力与锰包覆量呈正比关系,其中滞留因子(Y)=15.1X+19.8。(4)锰包覆骨炭的中和能力随着骨炭包覆量增大而减小。锰包覆骨炭具有强的抗酸抗碱能力。骨炭中的磷酸盐释放相对于钙是抑制的,这由于H2PO3-和Mn2+的表面沉淀。(5)利用Matlab可以很好的模拟As(V)在多孔介质骨炭中的迁移数值,具有潜在的预测应用前景。
[Abstract]:Arsenic in acid mine wastewater comes from the oxidative release of arsenic sulphide, which leads to the appearance of high arsenic in the surface and groundwater, which is a threat to the environment and local people. Hydroxy phosphate limestone and arsenic (V) are used as alkaline medium and pollutant respectively. The adsorption behavior of the coating layer was investigated by establishing different manganese coating layers on the bone carbon surface. The migration behavior of arsenic (V) in bone charcoal was investigated by column experiment, and the quantitative relationship between retention capacity and cladding development was established. The effects of three common cations of Fe,Al,Mn on arsenic migration were investigated in 27 groups with five factors and three levels. The migration numerical simulation is carried out with Matlab software. The main results are as follows: (1) Manganese coated layer can effectively improve the adsorption capacity of as (V) by bone charcoal, and the adsorption amount is 78 times that of fresh bone charcoal. (2) under the same desorption condition, manganese coated layer can fix more arsenic (V). Than fresh bone charcoal. The desorption ratio of various manganese coated bone charcoal is 0.02-0.6 of the amount of arsenic adsorbed, which is better than fresh bone charcoal (30%). Two desorption processes were found in bone carbon with high manganese content (B5, B6 and B7). (3) the retention capacity of bone charcoal to arsenic was proportional to the amount of manganese coating, and the retention factor (Y) was 15.1X 19.8. (4) the neutralization ability of bone carbon coated with manganese decreased with the increase of the amount of bone carbon. Manganese coated bone charcoal has strong acid resistance and alkali resistance. Phosphate release from bone charcoal is inhibited relative to calcium, due to the surface precipitation of H _ 2PO _ 3- and Mn2. (5) the migration of As (V) in porous medium can be well simulated by using Matlab, which has a potential application prospect.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X751
本文编号：2285813
[Abstract]:Arsenic in acid mine wastewater comes from the oxidative release of arsenic sulphide, which leads to the appearance of high arsenic in the surface and groundwater, which is a threat to the environment and local people. Hydroxy phosphate limestone and arsenic (V) are used as alkaline medium and pollutant respectively. The adsorption behavior of the coating layer was investigated by establishing different manganese coating layers on the bone carbon surface. The migration behavior of arsenic (V) in bone charcoal was investigated by column experiment, and the quantitative relationship between retention capacity and cladding development was established. The effects of three common cations of Fe,Al,Mn on arsenic migration were investigated in 27 groups with five factors and three levels. The migration numerical simulation is carried out with Matlab software. The main results are as follows: (1) Manganese coated layer can effectively improve the adsorption capacity of as (V) by bone charcoal, and the adsorption amount is 78 times that of fresh bone charcoal. (2) under the same desorption condition, manganese coated layer can fix more arsenic (V). Than fresh bone charcoal. The desorption ratio of various manganese coated bone charcoal is 0.02-0.6 of the amount of arsenic adsorbed, which is better than fresh bone charcoal (30%). Two desorption processes were found in bone carbon with high manganese content (B5, B6 and B7). (3) the retention capacity of bone charcoal to arsenic was proportional to the amount of manganese coating, and the retention factor (Y) was 15.1X 19.8. (4) the neutralization ability of bone carbon coated with manganese decreased with the increase of the amount of bone carbon. Manganese coated bone charcoal has strong acid resistance and alkali resistance. Phosphate release from bone charcoal is inhibited relative to calcium, due to the surface precipitation of H _ 2PO _ 3- and Mn2. (5) the migration of As (V) in porous medium can be well simulated by using Matlab, which has a potential application prospect.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X751
【参考文献】
相关期刊论文 前1条
1 商平;孙恩呈;李海明;孔祥军;;环境矿物材料处理砷(As)污染水的研究进展[J];岩石矿物学杂志;2008年03期
，本文编号：2285813
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