College of Civil and Hydraulic Engineering, Huazhong University of Science and Technology
College of Civil Engineering, Taiyuan University of Technology
Tianjin Zhonglian Gelin Science and Technology Development Co. Ltd.

【目的】针对传统膨润土防渗衬垫在侵蚀性环境中防渗性能会大幅劣化的难题,自主研发了一种聚合物改性膨润土。【方法】通过渗透实验研究了聚合物改性膨润土对高盐溶液、强碱溶液和实际钢渣渗滤液的渗透系数,并采用Batch吸附实验探究了吸附时间、溶液pH值和溶液浓度对聚合物改性膨润土吸附钢渣渗滤液中Cr(Ⅲ)离子的影响。【结果】实验结果表明:未改性的钠化钙基膨润土对侵蚀性溶液的刚性壁渗透系数高达1×10-8m/s,而聚合物改性膨润土对高盐、强碱和钢渣渗滤液的柔性壁渗透系数均小于1×10-11m/s,且刚性壁渗透系数约为3×10-11m/s,在高盐、强碱等侵蚀性环境中表现出更优越的防渗性能。【结论】聚合物改性膨润土对Cr(Ⅲ)的吸附量随着吸附时间、溶液pH值和溶液浓度的增加而增加。钠化钙基膨润土和聚合物改性膨润土对Cr(Ⅲ)吸附符合准二阶吸附动力学模型;Langmuir等温吸附模型更好地描述了钠化钙基膨润土和聚合物改性膨润土对Cr(Ⅲ)的吸附特性。

【Purposes】 To prevent containment barriers failure caused by the high hydraulic conductivity of conventional bentonite to chemically aggressive leachates, the polymer-modified bentonite (PMB) was developed. 【Methods】 The permeability tests were conducted to investigate the hydraulic conductivity of PMB to high salinity solution, strong alkalinity solution, and steel slag leachate. Moreover, the effects of sorption time, solution pH, and initial Cr(Ⅲ) concentra-tion on Cr(Ⅲ) adsorption were investigated. 【Findings】 The results showed that the rigid-wall hydraulic conductivity of the conventional bentonite without polymer to aggressive solutions was as high as 1×10-8 m/s. In contrast, the PMB exhibited a much superior performance in aggres-sive environment, with the flexible-wall hydraulic conductivity being <10-11 m/s and rigid-wall hydraulic conductivity ≈3×10-11 m/s. 【Conclusions】 With the increase of sorption time, solu-tion pH, and initial Cr(Ⅲ) concentration, the Cr(Ⅲ) adsorption increases. The data fit the pseudo-second order kinetic very well. And, the adsorption isotherms are best-fit with the Lang-muir isothermal model.

国家重点研发计划资助项目(2019YFC1806000);国家自然科学基金资助项目(52078235)

姜璐莎,陈晓雄,蒲诃夫,等.聚合物改性膨润土对钢渣渗滤液及其 Cr(Ⅲ)离子的阻隔与吸附特性研究[J].太原理工大学学报,2023,54(4):577-584.

JIANG Lusha,CHEN Xiaoxiong,PU Hefu,et al.Barrier and sorption properties of polymer-modified bentonite to steel slag leachate and its Cr(Ⅲ) ion[J].Journal of Taiyuan University of Technology,2023,54(4):577-584.