CAJ | 학술논문

模拟雨水通过土壤的渗滤过程,进行了粉煤灰硬化体渗滤溶出试验.研究了外界水渗透通过粉煤灰硬化体时,其中可溶性Cr(Ⅵ)在硬化体、土壤、渗滤液中的迁移转换规律,评估了粉煤灰硬化体中Cr(Ⅵ)的溶出及其对土壤和地下水可能产生的影响.结果表明:水渗透通过粉煤灰硬化体时,会将其中部分的Cr(Ⅵ)带出,转移到土壤和渗滤液中;渗滤液中Cr(Ⅵ)的累计量与时间的对数呈线性增加关系,Cr(Ⅵ)的溶出过程主要受扩散控制;渗滤后体系中可溶性Cr(Ⅵ)总量显著减少,说明Cr(Ⅵ)在从硬化体向土壤和渗滤液中的迁移过程中还存在着形态的变化.灰色关联分析表明:溶出过程中,Cr(Ⅵ)的溶出与Ca2+和Na+的溶出有较密切的相关性.
모의우수통과토양적삼려과정,진행료분매회경화체삼려용출시험.연구료외계수삼투통과분매회경화체시,기중가용성Cr(Ⅵ)재경화체、토양、삼려액중적천이전환규률,평고료분매회경화체중Cr(Ⅵ)적용출급기대토양화지하수가능산생적영향.결과표명:수삼투통과분매회경화체시,회장기중부분적Cr(Ⅵ)대출,전이도토양화삼려액중;삼려액중Cr(Ⅵ)적루계량여시간적대수정선성증가관계,Cr(Ⅵ)적용출과정주요수확산공제;삼려후체계중가용성Cr(Ⅵ)총량현저감소,설명Cr(Ⅵ)재종경화체향토양화삼려액중적천이과정중환존재착형태적변화.회색관련분석표명:용출과정중,Cr(Ⅵ)적용출여Ca2+화Na+적용출유교밀절적상관성.
A percolation leaching test was carried out on cement-solidified fly ash specimens to simulate the case of rain penetrating into them, then into soil and finally into groundwater. The transportation and transformation of dissolvable Cr(Ⅵ) among the specimen, soil and leachate during the process were investigated. The impact of dissolvable Cr(Ⅵ) in fly ash on soil and groundwater was evaluated based on the above tests. The results show that: the Cr(Ⅵ) in the specimens could leach out and some was retained in the soil as water penetration occured; the Cr(Ⅵ) concentration in the leachate was increased with time according to the logarithm, which indicates that it is a diffusion-controlled leaching process; after the leaching test the total amount of dissolvable Cr(Ⅵ) in the system was much decreased, which means during the process Cr(Ⅵ) had undergone a transformation of valence or species. The leaching of Cr(Ⅵ) from the specimens was closely related to the leaching of Ca2+ and Na+ in the specimens, according to the result of gray incidence analysis.