Analytical Solution for Vacuum Electroosmosis Consolidation Considering Nonlinear Attenuation of Electric Permeability Coefficient of Copper-Contaminated Sediment

IF 1.6 4区环境科学与生态学 Q3 ENGINEERING, CIVIL

Journal of Environmental Engineering Pub Date : 2023-11-01 DOI:10.1061/joeedu.eeeng-7347

Wencheng Qi, Yang Shen, Shaoyu Li, Kaijia Chen, Junhong Xu

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Abstract

Conventional vacuum electroosmosis consolidation theory tends to assume that the electric permeability coefficient remains unchanged or attenuates linearly. In contrast, the sediment from environmental dredging projects contains copper contaminants, whose electrochemical reactions during electroosmosis may influence the soil properties. Consequently, electroosmosis experiments were conducted for copper-contaminated sediments. It was found that the electric permeability coefficient attenuated rapidly due to the generation of copper hydroxide flocculant deposits under electrochemical reactions. The attenuation was 67.89% after 48 h, and its attenuation trend had obvious nonlinear characteristics. On this basis, an expression for the attenuation of the electric permeability coefficient with time was obtained by fitting an exponential function. A two-dimensional vacuum electroosmosis consolidation model considering the nonlinear attenuation rule of the electric permeability coefficient was established, and the analytical solution of the pore water pressure was deduced. Vacuum electroosmosis experiments on contaminated sediment were carried out, and the measurement results of pore water pressure at the anode verified the rationality of the analytical solution. It was also compared with conventional vacuum electroosmosis consolidation theory, which showed that the analytical solution in this study is better able to predict the dissipation of pore water pressure during long-term vacuum electroosmosis.

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考虑铜污染底泥电渗透系数非线性衰减的真空电渗固结解析解

传统的真空电渗透固结理论倾向于假设电渗透系数保持不变或线性衰减。环境疏浚工程沉积物中含有铜污染物，其电渗透过程中的电化学反应可能影响土壤性质。为此，对铜污染沉积物进行了电渗实验。结果表明，在电化学反应过程中，由于氧化铜絮凝沉淀的产生，电渗透系数迅速衰减。48h后衰减67.89%，衰减趋势具有明显的非线性特征。在此基础上，通过拟合指数函数，得到了电渗透系数随时间衰减的表达式。建立了考虑电渗透系数非线性衰减规律的二维真空电渗透固结模型，推导了孔隙水压力的解析解。对污染沉积物进行了真空电渗透实验，阳极孔隙水压力测量结果验证了解析解的合理性。并与传统的真空电渗透固结理论进行了比较，结果表明，本文的解析解能够较好地预测长期真空电渗透过程中孔隙水压力的耗散。

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来源期刊

Journal of Environmental Engineering 环境科学-工程：环境

CiteScore

4.40

自引率

0.00%

发文量

127

审稿时长

6.0 months

期刊介绍： The Journal of Environmental Engineering presents broad interdisciplinary information on the practice and status of research in environmental engineering science, systems engineering, and sanitation. Papers focus on design, development of engineering methods, management, governmental policies, and societal impacts of wastewater collection and treatment; the fate and transport of contaminants on watersheds, in surface waters, in groundwater, in soil, and in the atmosphere; environmental biology, microbiology, chemistry, fluid mechanics, and physical processes that control natural concentrations and dispersion of wastes in air, water, and soil; nonpoint-source pollution on watersheds, in streams, in groundwater, in lakes, and in estuaries and coastal areas; treatment, management, and control of hazardous wastes; control and monitoring of air pollution and acid deposition; airshed management; and design and management of solid waste facilities. A balanced contribution from consultants, practicing engineers, and researchers is sought on engineering solutions, and professional obligations and responsibilities.