02469nas a2200253   450000500170000000800410001703500150005810000340007324500680010726000520017530000220022749000270024950000220027650001540029850200580045252013650051065000480187570000450192370000390196870000360200771000480204381000590209185600650215020260818090346.0301098s1983    th      r     000| 0eng d  a.b100279191 aJeyaseelan, Sithamparappillai12aA detailed investigation of clogging during artificial recharge  aBangkok :bAsian Institute of Technology,c1983  a63 leaves :bill.1 aThesis ;vno. EV-83-13  aTitle Page = 1984  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources & Development  aThesis (M.Eng.) - Asian Institute of Technology, 1983  aAn attempt is made to study the clogging of recharge wells by suspended  particles in recharging water with a laboratory scale model. The entire  study is carried out with a pilot scale model, which simulates the conditions  of recharge wells.  The effects of clogging are studied experimentally in terms of suspended  particles removal efficiency and headloss for different recharge rates and  influent concentrations. Sand and kaoline clay suspension, were used as  media and recharge water respectively.  It is found in this study that it is possible to predict the local con-  centration of suspended particles at various points, in the aquifer, by know-  ing the properties of the aquifer, the initial concentration, and recharge  rate from basic deep bed filter mathematical models. Since the particle re-  tention during recharge is a physico-chemical phenomenon, it is necessary to  carry out some laboratory scale experiments to find the characteristics of  the particular media and suspension. These estimated values for the parti-  cular suspension and the modified form of IVE's model for deep bed filtration,  were used to simulate the particle removal in the aquifer.  Furthermore, as the flow conditions within the aquifer cannot be exactly  predicted, three different flow conditions are assumed in the analysis and  the results were compared. 10aWater quality managementxNepalxPhewa Lake1 aVigneswaran, S.Vigneswaran,eChairperson1 aOrth, H.M.,eExamination Committee0 aYudhbir,eExamination Committee2 aRoyal Danish Government,eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. EV-83-13  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B20576