| Author | Mahmood, Talat |
| Call Number | AIT Thesis no. EV-88-25 |
| 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 | Feasibility of . hollow fiber microfiltration for solid
liquid separation from the aeration tank of an activated
sludge process was investigated. The study was divided into
short term experiments and a long term experiment. From the
short term experiments results. cyclic operation was found
effective against inter' module clogginq and hence resulting
in stable membrane flux.
Out of three different organic loadings given in the
long term experiment. 3 kg/Cm3. d) was found to be the
critical one. concerning solid liquid separation. 2
kg/( m3. d) was the most suitable loading. Membrane permeate
was free of turbidity, free of bacteria, completely
nitrified, partially denitrified and very low in effluent
COD concentration. The process operated at very high MLSS
concentration without sludge wastage. Low values of kinetic
coefficients (kd and Y) and F/M ratio were obtained showing
little sludge production at steady state.
0. 45 µm membranes operated at '1ower suction pressures
than 0.1 µm membranes. The · highest pressure requirement
during, around 4 months of operational period was within 0. 5
m head of water employing O'. 45 µm membranes. This idea
motivated the use of elevation difference as a · driving force
for membrane separation, precluding the pump suction.
The proposed system showed better quality of effluent
with much lower HRT. and high enough organic 1oading, when
compared with the extended aeration process, in context of
sludge production. |
| Year | 1988 |
| 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) | Yamamoto, K. |
| Examination Committee(s) | Orth, Hermann M. ;Vigneswaran, Saravanamuthu
|
| Scholarship Donor(s) | The Royal Norwegian Government
(Norade Scholarship) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1988 |