03524cas|a2200421 i 4500 20260818143201.0 150399s1990 th uzm rtt 00| a1eng d .b10359321 AIT Thesis no. EV-90-22 Vigneswaran, Balasubramaniam Influence of ionic strength and polymer on deep bed and membrane filtration Bangkok : Asian Institute of Technology, 1990 113, [5] p. Thesis ; no. EV-90-22 A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1990 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. Filters and filtration Vigneswaran, Saravanamuthu, Chairperson Mino, Takashi, Examination Committee Harada, Hideki, Examination Committee Kim Sun-Il, Examination Committee The Government of Finland, Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-90-22 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B18375 .b10359321 mnait x 240402 2 951012 m a x 0 mnait mnait mnarc 20 40 Barcode : 30050003045704 CREATED : 1994-05-17 RECORD # : i10447763 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003045712 CREATED : 1994-05-17 RECORD # : i10447775 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120222848 CREATED : 2016-11-05 RECORD # : i12974195 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 60207 60207 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. EV-90-22 30050003045704 2026-08-18 14:32:01 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. EV-90-22 30050003045712 2026-08-18 14:32:01 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. EV-90-22 30050120222848 2026-08-18 14:32:01 2026-08-18 40