Sulfide generation in anaerobic sulfate reduction process | |
| Author | Nguyen An Khang |
| Call Number | AIT Thesis no.EV-04-13 |
| Subject(s) | Sewage--Purification Sulphides Sewage--Purification--Hevy metals removal |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-04-13 |
| Abstract | Investigation of sulfide generation in anaerobic sulfate reduction process was carried out in two lab-scale reactors of UASB (6.6L) and CSTR (4.0L). Synthetic wastewater was used as a feed with ethanol as a carbon source and sodium sulfate as sulfate source. Start-up of the UASB with feed of 1200mg/L chemical oxygen demand (COD) and COD:S04 ratio of 2 was accomplished in about 3 weeks using seed sludge that has already been acclimatized under sulfidogenic condition from a previous reactor. By the end of the start-up period, COD removal of 28.6%, sulfate reduction of 90% and effluent sulfide of 89.4mg/L were obtained. After the start-up had been carried out successfully, two reactors were operated under steady state conditions for five experiments with different influent pH, COD:S04 ratio, and specific sludge activity (SSA), namely, 8.2, 1.5:1, 1; 8.5, 1.5:1, 1; 8.5, 1:1 , 1; 8.5, 1:1, 1.24; and 8.5, 1: 1, 1.49. For each of the five experiments COD removal, S04 removal, effluent sulfide production, was determined using standard method. The results indicate that COD removal efficiencies of UASB and CSTR were lightly different while S04 removal efficiencies of UASB were higher than of CSTR. COD:S04 ratio of 1:1 at SSA of 1.49 gS04/ lgVSS.day was found to generate the highest sulfide in effluent. Compared with CSTR, UASB was found to be more appropriate for anaerobic sulfate reduction process that generated higher amount of sulfide. |
| Year | 2004 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-04-13 |
| 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) | Satoh, Hiroyasu; Shipin, Oleg |
| Scholarship Donor(s) | AIT Fellowship |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2004 |