| Author | Montalbo, Andrew T. |
| Call Number | AIT Thesis no. EV-89-16 |
| Subject(s) | Sewage--Purification--Nitrogen removal
|
| Note | A thesis submitted in partial fulfillment of the requirement
for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Improvement of the existing water hyacinth system by adding
gravel media to remove NH3-N ·from the wastewater was evaluated in
this study. The gravel was laid at the bot tom of the tank to
provide support to the growth of denitrifying bacteria. Vertical
baffles were constructed between width of the tank to avoid flow
short circuiting . The system is termed hereafter as water
hyacinth- gravel system. The study was conducted in three modes
of operation.
The mode 1 operation compared the treatment efficiencies of
water hyacinth- gravel system with the water hyacinth system
without gravel. The results obtained showed that 89.7% of NH3-N
was removed in the water hyacinth- gravel system compared to 71.3%
in the water-hyacinth system without gravel at the 20 d hydraulic
retention time (HRT) . Other water quality parameters were also
monitored which showed in a better performance of the water
hyacinth-gravel system in treating wastewater than the existing
water hyacinth system without gravel.
In the mode 2 operation, the water hyacinth-gravel system
was operated with effluent recycle. The system with effluent
recycle had NH3 -N removal of 48. 496 compared to the the system
without recycle which had 34 . 8% of NH3 -N removal.
The mode 3 operation determined the effects of increasing
the tank length by connecting the 2 water hyacinth-gravel tanks
in series. It was found out that about 70% of Nff3-N was removed
in the second tank compared to 25% in the first tank at the 5 d
HRT. This suggests that nitrification/denitrification occurred
effectively in the second tank.
Over-all , water hyacinth- gravel system was found to be
better in removing NH3 - N than the water hyacinth system without
gravel. |
| Year | 1989 |
| 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) | Chongrak Polprasert |
| Examination Committee(s) | Samorn Muttamara ;Verink, Johan
|
| Scholarship Donor(s) | Government of France |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1989 |