Model tests for corrosion influence of electrode surface on electroosmosis in marine sludge

2017 3rd International Conference on Energy, Environment and Materials Science

能源学;生态环境科学;材料科学

Zheng, Lingwei^1,2 ; Li, Jinzhu^2 ; Shi, Hanru^2

Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou

310058, China^1

Ningbo Institute of Technology, Zhejiang University, Ningbo

315100, China^2

关键词: Deterioration rates;    Dewatering performance;    Electrode material;    Electrode surfaces;    Metal electrodes;    Practical engineering;    Surface corrosion;    Voltage potentials;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/94/1/012102/pdf
DOI  :  10.1088/1755-1315/94/1/012102

来源: IOP

【 摘 要 】

The corrosion of metal electrodes is inevitable on electroosmosis in soil. Surface corrosion of electrodes is also one of the reasons for increasing energy consumption in electroosmosis treatment. A series of laboratory tests were conducted employing three kinds of materials, aluminium, steel, and brass. To explore the impact of surface corrosion degree on electroosmosis, metal electrodes were pretreated with durations 0 h, 12 h, 24 h, and 36 h. After the pretreatment, corroded electrodes are used as anodes on electroosmosis. Water discharge, current, voltage potential were measured during the tests; water content was also tested at three points after the electroosmosis. The results showed that aluminium was better than steel in electroosmotic drainage while brass provided the worst dewatering performance. Surface corrosion did not influence the aluminium and steel on electroosmosis in marine sludge, but brass did. In the pretreatment of brass electrodes, corrosion rate had started to slow down at later periods, with the deterioration rate of dewatering reduced afterwards. As the results showed, it is not recommended to employ those easily deteriorated electrode materials from surface corrosion in practical engineering, such as brass; electrode material with higher electroosmosis exchange rate is recommended, such as aluminium.