| Author | Khantong Soontrapa |
| Call Number | AIT Thesis no. EV-87-23 |
| Subject(s) | Sedimentation and deposition
|
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Sediment from Nonthaburi Bridge vicinity of Chao Phraya River was
sampled and laid on two experimental units with 5 cm depth at the
beginning and artificial wastewater was supplied with no displacement
of sediment during whole period of the study. One unit was simulated
as aerobic condition. The other one was as anaerobic condition. Both
units were run simultaneously with same substrate and with same
contact time except the last run (Run no 4) which was operated only in
the aerobic unit. Effect of substrate concentration effect of
sediment condition and effect of contact time were studied on
reaction of substrate transformation by sediment.
There was evident of the importance of sessile microbial
populations in recycling nutrients and degrading organics in aquatic
environments especially attached heterotrophic biofilms under polluted
condition. The experimental results indicated that the reactions which
took place in the aerobic unit shifted with the organic loading. Main
reaction changed from nitrification to denitrification , and then to
sulfate reduction when organic loading was increased. Among the above
three reactions , nitrification did not occur in the anaerobic unit.
The contact time had effect in which shorter contact time provided
higher organic loading and less time for microbial decomposition of
the substrates. No sulfate reduction appeared until almost all of the
added nitrate- nitrogen was reduced under anaerobic condition. |
| Year | 1987 |
| 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) | Hanaki, K. |
| Examination Committee(s) | I, Fude ;Chongrak Polprasert
|
| Scholarship Donor(s) | DAAD , Germany |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1987 |