01927nas a2200241   450000500170000000800410001703500150005810000410007324500680011426000520018230000220023449000270025650001560028350200580043952008670049765000480136470000370141270000340144970000400148371000380152381000590156185600650162020260818112715.0271098s1981    th      r     000|  eng d  a.b102601221 aHettiaratchi, Joseph Patrick Anthony10aEvaluation of design parameters for deep-bed rapid sand filters  aBangkok :bAsian Institute of Technology,c1981  a61 leaves :bill.1 aThesis ;vno. EV-81-13  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development  aThesis (M.Eng.) - Asian Institute of Technology, 1981  aA process analysis method was developed for particle removal in deepened granular media filters, which would permit optimum filter design with a minimum of well designed pilot plant studies.  Mathematical models purporting to describe the dependency of filter coefficient, on specific deposit a were examined, based on controlled filtration experiments. Using an experimental system of unisized medium grains with stabilized  and destabilized suspensions, model parameters were evaluated for each sand  size and filtration rate . Empirical relationships showing the dependency of model parameters on system variables were developed. Application of the proposed models in predicting the concentration  and specific deposit profiles indicate that this method can permit prediction of filter performance, provided parametric dependence of model parameters is known. 0aSewagexPurificationxRotating disc process1 aNguyen, Cong Thanh,eChairperson1 aLonani, B.N.,eCo-Chairperson1 aWatanabe, Y,eExamination Committee2 aCDG (Germany),eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. EV-81-13  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B21607