| Author | Vigneswaran, Balasubramaniam |
| Call Number | AIT Thesis no. EV-90-22 |
| Subject(s) | Filters and filtration
|
| Note | A thesis submitted in partial fulfilment of the requirements for the
degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Chemical interactions among the suspended particles and filter media
grains play an important role in filtration process in deciding the filter
efficiency. Successful attachment and removal are prompted by
interparticle forces caused by electrostatic forces among them. These
forces depend on the zeta potential (ZP) of the particles and filter
medium.
A lab-scale study carried out to study the effect of ionic strength
on performance of a deep bed filter indicated that the filter efficiency
was minimum at low ionic strength values where ZP of particles in
suspension was negative. Increase of ionic strength yielded increase in
filter efficiency . The variation of filter efficiency at initial stage
and during the filter run was related to particle -filter grain and
particle-particle attachment coefficients (a and a respectively). p
The experimental study conducted to relate the polymer dose and the
deep bed filter efficiency indicated that there is a clear optimum of
polymer dose with respect to filter efficiency . Maximum a a and almost
' p
zero ZP were obtained at this polymer dose.
The effect of ionic strength on membrane filtration was studied
experimentally. This study clearly showed that the ionic strength which
corresponds to near zero negative zeta potential of suspension resulted
in maximum flux.
The quantitative approach illustrated in this study for the effect
of ionic strength and polymer dose in deep bed filtration and membrane
filtration will give a fillip for incorporation of chemical effects in
design consideration. |
| Year | 1990 |
| 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) | Vigneswaran, Saravanamuthu
|
| Examination Committee(s) | Mino, Takashi ;Harada, Hideki ;Kim Sun-Il
|
| Scholarship Donor(s) | The Government of Finland |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |