Flow-electrode capacitive deionization process for chromium removal from contaminated groundwater | |
| Author | Timala, Shaurya |
| Call Number | AIT Thesis no.EV-24-06 |
| Subject(s) | Groundwater--Purification Chromium |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Abstract | This study investigated the effectiveness of Flow-electrode Capacitive Deionization (FCDI) in removing Cr(VI) from synthetic contaminated water. Through experimentation with single and dual channel FCDI setups, various tests were performed with different Cr (VI) concentrations and voltage adjustments. This research revealed significant insights into the performance of FCDI systems, particularly in relation to the Cr(VI) removal efficiency, configuration type, and energy consumption. Notably, the single-channel FCDI configuration demonstrated superior Cr(VI) removal efficiency, achieving rates exceeding 90% across Cr(VI) concentrations ranging from 5 mg/L to 20 mg/L. In contrast, the dual channel setup exhibits lower efficiency rates. Voltage optimization within the range of 1.2 to 2.0 V was found to be crucial, with the highest removal efficiency observed at 2.0V voltage for 100 mL batch tests. Furthermore, this study aimed to assess the impact of Humic Acid on system performance. Higher concentrations of Humic Acid led to a noticeable reduction in the removal efficiency, indicating the sensitivity of the FCDI system to organic constituents. A reduction of up to 26% was observed at higher levels of humic acid. These findings underscore the potential of the FCDI technology as an alternative solution for Cr(VI) remediation in contaminated water sources. By identifying the optimal operational parameters and understanding the system behavior under varying conditions, the long-term operation of Cr(VI) contaminated water containing common cations and anions of varying concentrations was analyzed with a flow rate of 10 mL/min in single-pass mode. The maximum removal efficiency reached a peak of 68 % for the first cycle of 24 hour operation which was observed for feed solutions of lower pH and operated in short-circuited closed cycle mode. The consequent cycles showed decreasing levels of removal efficiency, which resulted in a decline in system performance. |
| Year | 2024 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Xue, Wenchao |
| Examination Committee(s) | Ekbordin Winijkul;Shipin, Oleg V. |
| Scholarship Donor(s) | AIT Scholarships |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2024 |