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008 150399s1990 th uzm rtt 00| a1eng d
035 _a.b10359321
099 9 _aAIT Thesis no. EV-90-22
100 1 _aVigneswaran, Balasubramaniam
245 1 0 _aInfluence of ionic strength and polymer on deep bed and membrane filtration
260 _aBangkok :
_bAsian Institute of Technology,
_c1990
300 _a113, [5] p.
490 1 _aThesis ;
_vno. EV-90-22
500 _aA thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1990
520 _aChemical 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.
650 0 _aFilters and filtration
700 1 _aVigneswaran, Saravanamuthu,
_eChairperson
700 1 _aMino, Takashi,
_eExamination Committee
700 1 _aHarada, Hideki,
_eExamination Committee
700 1 _aKim Sun-Il,
_eExamination Committee
710 2 _aThe Government of Finland,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. EV-90-22
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B18375
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