Pilot-scale biological sulfide oxidation process for treating effluent from Rayon industry | |
| Author | Maung Myo Kyaw |
| Call Number | AIT Thesis no.EV-08-20 |
| Subject(s) | Rayon industry and trade--Waste disposal Sulphides--Oxidation |
| 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 investigation was involved the design of pilot scale biological sulfide oxidation concentric draught-tube internal-loop airlift reactor based on the available laboratory scale experiment. This pilot scale biological sulfide oxidation airlift reactor was fabricated and installed at Thai Rayon Industry. The sulfide oxidation airlift bioreactor which contained mixed cultured of sulfide oxidizing bacteria oxidized sulfide to elemental sulfur and sulfate. The purpose of this experiment was to investigate the optimum oxygen supply for maximum sulfide removal and sulfur recovery as well as sulfide loading rate. In this research, the concentric draft-tube internal-loop bioreactor was used because of its good mixing property. Thus a high recirculation inside the reactor was achieved and most of sulfide was converted to elemental sulfur which was settled down in the secondary sedimentation tank. The biological sulfide oxidation was investigated under the optimal operating conditions for maximizing sulfide removal and sulfur production during the steady state conditions. The airlift bioreactor was operated under optimum pH (7.5-8) and ambient temperature (30-40 °C). The flow rate and HRT were maintained 600 L/day and 4 hrs respectively. The sulfide loading rate steadily increased up to 4.38 kg HS/m³-day by increasing the influent sulfide concentrations up to 730 mg/L. The DO concentrations were maintained less than 0.2 mg/L during the whole process. In addition, cost benefit analysis (CBA) was compared base on economic and environmental aspects between conventional treatment and developed technology. |
| Year | 2008 |
| 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) | Chongrak Polprasert;Nguyen, Thi Kim Oanh; |
| Scholarship Donor(s) | Government of France;Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2008 |