通过使用CaO-GGBS稳定/固化Mn污染的粘土泥:阴离子的影响
1School of Civil Engineering, Architecture and Environment, Hubei University of Technology, 430068, China; School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore; Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes, Hubei University of Technology, 430068, China.
Chemosphere
|June 2, 2023
概括
这项研究表明,活 (CaO) 激活的磨砂颗粒高炉渣 (GGBS) 有效地固化了被污染的粘土泥. 与酸盐相比,硫酸盐离子的存在显著提高了处理的泥中的强度和降低了的可性.
科学领域:
- 地质技术工程 地质技术工程
- 环境工程 环境工程
- 材料科学 材料科学 材料科学
背景情况:
- 疏会产生大量被污染的粘土泥,造成环境和健康风险.
- 稳定/固化 (S/S) 使用活 (CaO) 激活的地面颗粒高炉渣 (GGBS) 是一种潜在的处理方法.
- 阳离子 (硫酸盐和酸盐) 对CaO-GGBS污染的Mn粘土泥的S/S效率的影响在很大程度上没有得到研究.
研究的目的:
- 调查CaO-GGBS在处理含硫酸 (MnSO4) 和酸 (Mn(NO3) 2) 的粘土泥中的S/S效率.
- 探索硫酸盐 (SO42-) 和酸盐 (NO3-) 离子对处理后泥的强度,透性,矿物学和微观结构的影响.
- 为了确定CaO-GGBS对于安全处置污染的粘土泥的适用性.
主要方法:
- 使用CaO-GGBS处理含MnSO4和Mn(NO3) 2的粘土泥.
- 评估未受限制的压力强度 (UCS) 和的可性.
- 使用像X射线衍射 (XRD) 和扫描电子显微镜 (SEM) 等技术分析矿物学和微观结构.
主要成果:
- -GGBS处理显著提高了两种类型的污染泥的强度,满足了美国环境保护局 (USEPA) 垃圾填埋要求.
- 在经过处理的泥中,的化能力在经过56天的固化后降低到低于饮用水的欧元限制.
- 含有MnSO4的泥比含有Mn(NO3) 2的泥具有更高的UCS和更低的Mn可性,这归因于硫酸盐离子促进的化石的形成.
结论:
- O-GGBS是Mn污染的粘土泥的有效S/S剂,其中阴离子起着关键作用.
- 与酸盐离子相比,硫酸盐离子促进了乙石的形成,从而提高了强度和降低了Mn可性.
- 阳离子识别对于优化CaO-GGBS处理污染的粘土泥至关重要.
更多相关视频
相关概念视频
Hydration of Cement
299
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
299
Ionic Strength: Effects on Chemical Equilibria
1.5K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.5K
Qualitative Analysis
22.4K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
22.4K
Sulfate Attack on Concrete
203
Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
Sulfates from sources like soil, groundwater, or industrial effluents...
Sulfates from sources like soil, groundwater, or industrial effluents...
203
Alkali Aggregate Reaction in Concrete
143
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
143
Factors Affecting Solubility
33.6K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.6K


