| Author | Numfon Eaktasang |
| Call Number | AIT Thesis no.EV-09-18 |
| Subject(s) | Sewage--Purification--Anaerobic treatment
|
| 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 |
| Abstract | The laboratory-scale experiments on biohydrogen production were conducted with glucose as the substrate under dark fermentation and ambient (25°C) conditions. The optimum conditions for H₂ production were found at the pH, COD concentration and HRT of 5.5, 2,000 mg/L and 3 days, respectively. The H₂ contents were 61.2 ± 1.0 % of the produced biogas and the highest of Hz yield was found to be 5.73 ± 0.001 mol-H₂/mol-glucose added or 0.062 ± 0.001 g H₂/g COD added. The microbial community of the hydrogen-producing bacteria was found to be present in the fermentation reactors, investigated by Gram's staining and presumptive in selective medium was a group of Clostridium sp., gram-positive bacteria and rod shape in morphology. The scale-up experiments employed a 5-L continuous stirred-tank reactor (CSTR) and using a brewery wastewater as the organic substrate. Under the same optimum conditions obtained from the laboratory-scale experiments, the highest of H₂ yield was found to be 0.050 ± 0.010 g H₂/g COD added and the H₂ contents were 64.9 ± 2.4% of the produced biogas. With respect to the effects of nanoscale zero-valence-iron (nZVI) dosage, the H₂ production was observed to increase with increasing nZVI dosage and was higher than the reactor without the nZVI addition. The highest of H₂ yield was found to be 3.94 ± 0.02 mol-H₂/mol-glucose added or 0.040 ± 0.001 g H₂/g COD added at nZVI dosage of 500 mg/L. The additional amount of H₂ production was found to increase from 0.023 ± 0.001 to 0.044 ± 0.001 g H₂/g COD added with increase nZVI dosages of 100 to 500 mg/L and the H₂ contents were 63.1 ± 0.5 % of the produced biogas. It could be stated, based on the results of this study, that the nZVI had positive effects on H₂ production |
| Year | 2009 |
| 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) | Chongrak Polprasert; |
| Examination Committee(s) | Annachhatre, Ajit P.;Shipin, Oleg V.; |
| Scholarship Donor(s) | RTG Fellowship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2009 |