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U. Glawe
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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ELECTROREMEDIATION OF ZN(II) CONTAMINATED SOFT BANGKOK CLAY WITH CATHODE DEPOLARIZATION TECHNIQUE P. Asavadorndeja; K. E. Roehl; U. Glawe; L. Sthapit
Lowland Technology International Vol 7 No 1, June (2005)
Publisher : International Association of Lowland Technology

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Abstract

Four electrokinetic experiments were performed to examine the application of electrokinetic remediation to remove heavy metals from the soft Bangkok clay. The experiments were carried out by applying a direct-current electric field of 20 V through the soil loaded with Zn(II) at the level of 1,000 mg per kg for 3 and 7 days. In addition, the cathode depolarization technique, in which hydroxide ions generated from electrolysis reactions are eliminated by flushing acidic solution into a cathode reservoir, was introduced to improve the efficiency of electrokinetic remediation. The experiment results showed that only electrokinetic remediation was able to remove 82 percent of the contaminants in a period of one week. During this period, the combination of electrokinetic remediation with the cathode depolarization technique has raised the removal efficiency after 7 days of the treatment by 15 percent while the energy expenditure was slightly increased from 273 kWh per m3 to 301 kWh per m 3 . Therefore, the application of electrokinetic remediation with the cathode depolarization technique can be considered as an efficient ground remediation method for the soft Bangkok clay.
SORPTION CHARACTERISTICS OF THE SOFT BANGKOK CLAY L. Sthapit; C. S. P. Ojha; U. Glawe
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Asian countries are in a need for identification of suitable sites for disposal of municipal solid wastes. The travel of pollutants is significantly influenced by the properties of the porous medium through which these travel. In Thailand, existing land disposal sites, which were initially selected in view of the low lying areas or the water bodies, are likely to last not for many years. In the light of this, it is essential that soils available in the region are tested and evaluated for their specific characteristics relevant to the safe disposal of solid wastes and planning of future landfill sites. Sorption characteristics are of special significance in the design of landfills. In this paper, the Bangkok clay has been evaluated for its sorption characteristics. Various adsorption isotherm models are tested and it has been observed that the Langmuir model performs best. The study indicates that the process of sorption is non-linear in nature and is sensitive to the type of influent characteristics.
Co-Authors C. S. P. Ojha K. E. Roehl L. Sthapit P. Asavadorndeja