Removal of arsenic (As +3) from aqueous solution by uncoated and iron coated sand | |
| Author | Parunyoo Rattanaburee |
| Call Number | AIT Thesis no.EV-16-12 |
| Subject(s) | Arsenic Arsenic--Environmental aspects Water--Purification--Arsenic removal |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-16-12 |
| Abstract | Arsenic is a world problem which naturally contaminated in ground water as a main source of drinking water and water consumption for human. The purpose of this research was to reduce the arsenic concentration in ground water to reach the standard in Thailand (50 μg/L). Uncoated sand (UCS) and iron coated sand (ICS) were used for removing the arsenic in water as low cost adsorbents. The purpose was to study the arsenic removal efficiency of uncoated sand (UCS) and iron coated sand (ICS) by varying pH, adsorbent dose, initial arsenic concentration and contact time. Further continuous experiment, the column experiment were conducted to study the removal efficiency, exhaustion time, the breakthrough curve and the effect of bed height on uptake capacity of uncoated sand and iron coated sand. The isotherm study showed that the data fitted well with the Langmuir isotherm model with the arsenic adsorption capacity 0.007 and 0.0015 mg/g for coated sand and uncoated sand, respectively. pH 8.5 was the maximum arsenic removal by UCS and CS. The kinetic study showed that pseudo-second-order kinetic model fitted best to the experimental data. The adsorption rate was fast until reach 3 hours, afterward the rate of adsorption declined until becoming steady about 12 hours. In the continuous experiment, the studies of removal efficiency, breakthrough and exhaustion time were investigated at different bed height (12.5. 25, 37.5 and 50 cm). Four cycles of column experiment were conducted to study the performance of UCS and CS through backwash process. The HRT value was ~3 hours and flow rate was 60 mL/hour. The removal efficiency of arsenic in uncoated sand column was ~51, 62, 77 and 74% in 1st, 2nd, 3rd and 4th cycle, respectively and, the arsenic removal efficiency of coated sand was ~98, 87, 94 and 81% in 1st, 2nd, 3rd and 4th cycle, respectively. |
| Year | 2016 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| 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) | Annachhatre, Ajit P.; |
| Examination Committee(s) | Shipin, Oleg V. ;Thammarat Koottatep; |
| Scholarship Donor(s) | Kurita - GK Chemical Co., Ltd.;Royal Thai Government Fellowship ; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2016 |