Sulfur recovery from biological sulfide oxidation process under oxygen limited condition | |
| Author | Wilawan Khanitchaidecha |
| Call Number | AIT Thesis no.EV-06-51 |
| Subject(s) | Sulphur--Environmental aspects Sulphur--Oxidation |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management, School of Enviromnent, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-06-51 |
| Abstract | An aerobic bioreactor, the airlift reactor was tested for recovering sulfur from aqueous sulfide in this study. The airlift bioreactor contained chemolothotrophic sulfide oxidizing bacteria, which oxidized dissolved sulfide to elemental sulfur and separated from the aqueous phase. The airlift bioreactor was operated under pH (7 .2-7. 8) and DO control. The sulfide removal and nature of products f01med under various sulfide loading rate and oxygen concentration were examined. The maximum sulfide loading rate supplied to the bioreactor was 3 kgS/m3-day, of which 97.87% was completely oxidized and 87.13% recovered as sulfur, 14.38 g/d of sulfur production. The recovered sulfur consisted of 64.89% moisture content and the purity was 94.29%. Its structure was orthorhombic elemental sulfur which absolutely perfect than the commercial grade sulfur; 99.9% of purity, based on the analytical grade sulfur; 99.999% of purity. The melting point and density were 112.8°C and 2.07 g/cm3 respectively. The purity of recovered sulfur after heating under closed system increased to 99.56% and the structure as well as physical properties of molten sulfur were the same as biologically produced sulfur before heating. |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-06-51 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Annachhatre, Ajit P. |
| Examination Committee(s) | Preeda Parkpian; Nowarat Coowanitwong; Aramaki, Toshiya |
| Scholarship Donor(s) | RTG Fellowship |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2006 |