| Author | Chen, Dar Wen |
| Call Number | AIT Thesis no.EV-90-6 |
| Subject(s) | Sewage--Purification--Filtration
|
| 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 | Detailed experimental studies on backflush technique in
crossflow microfiltration is reported. Experiments were conducted
at varying backflush frequency and duration and different nature
of different suspension. The 1 min. of backflush frequency and 5
sec. of backflush duration were found to be optimum a nd this
improved the flux by 200% in the case of Kaolin clay suspension.
The application of various of filtration laws proposed by
Hermans and Bredee to describe the standard blocking model a nd
cake filtration model were verified. From the study conducted in
the Kaolin clay and colloids suspension, it was found that no
single mechanism was sufficient to describe clogging.
The pretreatment of flocculation by alum for prior particle
size enlargement was found to improve microfiltration performance
significantly.
The suitability of crossflow microfiltration with backflush
technique for the treatment of natural water and filter back wash
wastewater were also studied. The periodic backflush technique
applied once in 1 min. for 5 sec. duration was found to be
optimum. the flux increase was 250% and 148% for natural water
and filter back wash wastewater, respective l y , with backflush
technique compared to those without backflush technique. |
| Year | 1990 |
| 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) | Vigneswaran, Saravanamuthu
|
| Examination Committee(s) | Chongrak Polprasert ;Tran, Francis T. ;Li, Kim Sun
|
| Scholarship Donor(s) | Republic of China |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |