Assessing the use of aluminium electrodes on the electrokinetic dewatering and stabilization of dredged mud slurries

Malekzadeh, M., and Sivakugan, S. (2016) Assessing the use of aluminium electrodes on the electrokinetic dewatering and stabilization of dredged mud slurries. In: Selected Papers from Sessions of Geo-Chicago 2016, pp. 188-202. From: Geo-Chicago 2016: sustainable waste management and remediation, 14-18 August 2016, Chicago, IL, USA.

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Abstract

Every year a large amount of dredged sediments are disposed or used for land reclamations. To reduce the time lag for construction purposes, electrokinetic stabilization is suggested as an environmentally friendly and cost effective method to dewater and stabilize the dredged mud deposited in the paddocks. However, the physiochemical changes due to the electrochemical reactions in the dredged sediments are drawbacks of this technique that need to be investigated. The type of electrode to be used in the stabilization affects the physiochemical changes, and therefore using the correct type of electrodes is important. Different electrodes are used to stabilize different types of soils. Literature suggests that aluminum is a good option as it improves the soil and causes electrochemical strengthening by inducing Al3+ ions into the soil. In this study, the effect of aluminum mesh electrodes on the electrokinetic stabilization of the dredged mud is investigated. After the completion of the electrokinetic stabilization, samples are taken from different depths and water content, pH, electrical conductivity and atterberg limits are determined. From cathode to anode, the liquid limit decreases and plastic limit increases significantly. Near the anode, pH is reduced by 90% and the electrical conductivity increased. Higher salt content is also observed near the anode at the bottom of the column. The lowest water content and highest strength are obtained near the anode. Almost 54 % of the water is removed from the system due to electroosmosis. Despite the electrochemical changes in the soil, its settlement was about 17% which was not very significant; however, variation of electric current shows that the aluminum mesh is corroded before the settlement of the soil is completed. Therefore aluminum mesh electrodes are not suggested to be used for electrokinetic stabilization of dredged mud sediments.

Item ID: 45414
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: electrokinetic, aluminum mesh, electrodes, dewatering, soil settlement
ISBN: 978-0-7844-8014-4
Date Deposited: 15 Jun 2017 03:00
FoR Codes: 04 EARTH SCIENCES > 0499 Other Earth Sciences > 049999 Earth Sciences not elsewhere classified @ 20%
09 ENGINEERING > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering @ 20%
09 ENGINEERING > 0914 Resources Engineering and Extractive Metallurgy > 091402 Geomechanics and Resources Geotechnical Engineering @ 60%
SEO Codes: 87 CONSTRUCTION > 8798 Environmentally Sustainable Construction > 879899 Environmentally Sustainable Construction not elsewhere classified @ 60%
96 ENVIRONMENT > 9614 Soils > 961401 Coastal and Estuarine Soils @ 20%
96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961104 Physical and Chemical Conditions of Water in Marine Environments @ 20%
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