| Author | Baskaran, Kanagaratnam |
| Call Number | AIT Thesis no. EV-88-10 |
| Subject(s) | Sewage--Purification--Activated sludge process
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Laboratory experiments were carried out on Attached Growth Activated Sludge Process (AGASP) with volume of attached-growth media
in the aeration tank varied at 5%, 10%, and 15% of the aeration tank
volume. Different organic loadings (F /M ratio) and different solid
retention time(9 ) of the reactors were operated to investigate the
c
process kinetics and process efficiency. The experiments were carried
out in three phases. In the first phase, the 9 were varied from 5 days c
to 20 days at a constant organic loading of 0. 3 kg COD/ (kg MLSS. d).
In the second phase the optimum 9 was fixed while the organic loadings c
were varied from 0. 3 to 1. 0 kg COD/ (kg MLSS. d). Synthetic waste
(sodium acetate and ammonium sulfate as main ingredients for carbon
and nitrogen sources) was utilized as feed. The hydraulic retention
time(9) and influent NH3 -N concentration were maintained at 8 hours
and 65 mg/L, respectively, throughout the first two phases of experiments. In the third phase the 9 and the Organic Loading were fixed
c
at 10 days and 0.3 kg COD/(kg MLSS.d), respectively while the influent NH3 -N concentration was increased to 100 mg/L .
Experimental results from the first phase revealed that the 9
c
of 10 days in all AGASP reactors provided the optimum process efficiency with respect to Carbonaceous and nitrogenous compound removal.
At this 9c the carbon (COD) removal was 97% and NH3 -N concentration
in the effluent was not detectable. In the second phase, complete
NH3 -N removal was observed in the AGASP reactors with 5% and 10%
media at organic loadings between 0.3 - 1.0 kg COD/(kg MLSS . d). The COD
removal in all four reactors we re between 94% - 98%. In third phase,
when the AGASP reactors were fed with a high strength nitrogenous waste
(NH3 -N = 100 mg/L). The AGASP reactor with 15% media gave t he optimum
NH3 -N removal efficiency of 95%.
The experimental results obtained suggested that the installation
of 10% media in the aeration tank of an activated sludge reactor will
provide a high degree of COD and NH3 -N removal. AGASP with 10% media
was found to produce an effluent which should
effluent standards when operated at organic
1 . 0 kg COD/(kg MLSS.d) .
satisfy most stringent
loadings be tween 0.3 -
A mathematical model established based on a comination of MONOD expression and diffusion equation could predict the effluent
quality of t h e AGASP . |
| Year | 1988 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Environmental Engineering (EV) |
| Chairperson(s) | Chongrak Polprasert |
| Examination Committee(s) | I, Fude ;Vigneswaran, Saravanamuthu
|
| Scholarship Donor(s) | The Roya l Netherland Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1988 |