| Author | Balakrishnan, Velautham |
| Call Number | AIT Thesis no.EV-87-16 |
| 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 Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Experiments with synthetic waste as substrate showed that
Intermittent flow system (IFS) had better performance than Continuous
flow system (CFS) in activated sludge process. Even though effluent FTOC
was better in IFS than CFS for same HRT and COD loading, sludge
settlability was the. important parameter that gave the advantage to
IFS over CFS . This research study ascertain that IFS could be operated
without sludge bulking problem and better effluent qualities compared
with CFS, where poor settlability and sludge bulking were often the
operational problems, particularly at short HRTs and high volumetric
loadings .
IFS could be operated at HRT range of 4.74 h to 18 . 95 hand loading
range of 0.42 to 2.41 kg COD/m3 .d with F/M ratio ranging from 0 . 42 to
1.10 g COD/g MLVSS . d.
Treatability of waste with different cycle time (or different HRT)
showed that shorter aeration period such as 1 1/2 to 2 h was enough to
achieve about 92% COD removal efficiency with good sludge settlability.
Higher unit oxygen uptake rate in IFS over CFS indicated that high
microorganisms activity in IFS than CFS.
Better effluent quality of IFS over CFS indicated that intermittent
activated sludge process could be adopted to meet the stringent effluent
standard. |
| 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) | Orth, Hermann M. ;Shin, H. S.
|
| Scholarship Donor(s) | The Royal Netherlands Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology,1987 |