Fundamental study of contaminant migration through soft Bangkok clay | |
| Author | Siddiqua, Sumi |
| Call Number | AIT Thesis no.GE-03-02 |
| Subject(s) | Clay soils--Thailand--Bangkok Soil pollution--Thailand--Bangkok |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-03-02 |
| Abstract | In this thesis, contaminant transport mechanisms in the Soft Bangkok Clay were investigated. Experiments in laboratory scale were performed and a theoretical model was utilized to identify coefficients involved in contaminant transport mechanism. Since the clay mineralogical composition controls the transport mechanism of fine grained soils, X-ray diffraction test and cation exchange capacity of the clay was additionally performed. Column tests were conducted to determine the contaminant transpo1t parameters. Tests were carried with different influents concenh·ation (NaCl, CaCh, KC!), different hydraulic gradients (i=lOO, 50, 30) and with a different test periods ranging from 30 to 45 days. Non-reactive and reactive h·aces were used as influents to simulate contaminants. The computer program POLLUTE was used to fit theoretical curves by adjusting the values of diffusion (De) and dish·ibution (Kt) coefficients to the results of column tests. The appropriateness of the model was justified by comparing the experimental results with predicted values. Batch equilibrium tests were performed to dete1mine the adsorption characteristics of the clay with respect to a specified cations. Results from these tests were plotted as adsorption isotherm. lsothe1m were developed for each solution. In this way, values of dish·ibution coefficients, Kt were obtained. The migration of different chemical species through the clay may be affected by the tortuosity factor ( 't). This factor was also calculated by comparing the effective diffusion coefficients (obtained from column tests) with free water diffusion coefficients for each tracer. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-03-02 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Glawe, Ulrich |
| Examination Committee(s) | Bergado, Dennes T.; Noppadol Phien-wej |
| Scholarship Donor(s) | Asian Development Bank, (ADB) Japan |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2004 |