Dialysis bio-reactor chitosan membrane for biological denitrification | |
| Author | Tran Thi My Dieu |
| Call Number | AIT Thesis no. EV-98-22 |
| Subject(s) | Sewage--Purification--Nitrogen removal Chitosan Membrane separation |
| 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 |
| Abstract | This study deals with establishment and operation of a Dialysis Bio-Reactor (DBR) using chitosan membrane for biological denitrification. Characterization of chitosan membrane suggested that permeability and flux of nitrate ions increased with increased pH and initial feed concentration. Permeability and flux values, however, decreased with increased membrane thickness. Investigations on DBR were carried out in three separated reactor configurations namely Dialysis Suspended-growth Bio-Reactor (DSBR), Dialysis Biofilm and Suspended-growth Bio-Reactor (DBSBR), and Dialysis Biofilm Bio-Reactor (DBBR). Denitrification studies with suspended denitrifying population in DSBR with effluent recirculation yielded denitrification rate of about 1400-2650 mg N03"-N/m 3 .h with MLVSS of 1140 mg/L in permeate side. Studies on DBSBR with and without effluent recirculation showed that denitrifying biofilm could be successfully grown on chitosan membrane. Total denitrification rate achieved in DBSBR was 4600-4800 mg N03 ยท-N/m 3 .h with effluent recirculation, and about 8000-16000 mg N03"-N/m3 .h without effluent recirculation. Denitrification rate as high as 4500-4600 mg N03--N/m3 .h could be achieved in DBBR in both cases with and without effluent recirculation. Alkalinity generated due to denitrification was in the range of 0.99-1.08 (eqv./mole ofN03--N) and matched satisfactorily with the theoretical value of 1 (eqv./mole of N03--N). Investigations in biofilm kinetics suggested that N03--N removal rate followed half order kinetics when N03--N concentration in bulk was less than 30 mg N03--N/L, while N03--N removal rate followed zero order kinetics when N03--N concentration in bulk was higher than 30 mg N03--N/L. |
| Year | 1998 |
| 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) | Takizawa, Shatoshi ;Suwalee Chandrkrchang ;Malinen, Raimo 0.; |
| Scholarship Donor(s) | Swiss Agency for Development and Cooperation (SDC/Vietnam) ; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1998 |