02585nam a2200253   450000500170000000800410001703500150005810000220007324500920009526000520018730000100023949000270024950001520027650200580042852014460048665000440193270000450197670000490202170000400207070000480211071000490215881000590220785600650226620260818090346.0011298s1985    th      r    0000|00eng d  a.b100279201 aSuazo, Ronillo B.12aA detailed investigation of physical and biological clogging during artificial recharge  aBangkok :bAsian Institute of Technology,c1985  a83 p.1 aThesis ;vno. EV-85-16  aA thesis submitted in partial fulfillment of requirements for the degree of Master of Engineering, School of Environment, Resources and Development  aThesis (M.Eng.) - Asian Institute of Technology, 1985  aAn attempt was made to study the physical and biologicals clogging during artificial recharge with an experimental model which simulates artificial recharging practice by taking into consideration practical recharging practice by taking into consideration practical factors like effective infiltration rate of the media, size, porosity and media depth.  Recharging was investigated experimentally in terms of suspended solids removal, BOD3 removal, TOC removal and COD removal at different sand sizes and infiltration rates. To understand the physical  phenomena involved, the effect of suspended solids concentrations, infiltration rate and media size on headless, suspended solids removal efficiency and specific deposits was studied and verified with the use of simple mathematical models. Three stages of biological clogging were observed. It is possible to predict the cumulative discharge during artificial recharge with the knowledge of the initial infiltration rate and application time. This was compared with the experimental results. The use of the physical constants involved, which is a function of the infiltration rate and sand size, needs to be investigated further in order to understand its variation with sand size. Factors affecting BOD3 removal were investigated. At the steady-state condition, the effect of infiltration rate, sand size and suspended solids concertation on the reaction rate constant was also studied.  0aWater, UndergroundxArtificial recharge1 aVigneswaran, Saravanamuthu, eChairpeson1 aOhgaki, Shinnichiro, eExamination Committee1 aOrth, H.M., eExamination Committee0 aChongrak Polprasert,eExamination Committee2 aRoyal Danish Government, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. EV-85-16  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B20015