02556cas|a2200241 i 450000500170000000800410001703500150005810000270007324500600010026000520016030000110021249000270022350001060025050200580035652015800041465000400199470000380203470000430207270000440211571000310215981000590219085600650224920260817162838.0170399s1992    th  u m rtt   0|  a1eng d  a.b100874241 aAgarwalla, Binod Kumar10aApplication of biofilm model in facultative pond design  aBangkok :bAsian Institute of Technology,c1992  a131 p.1 aThesis ;vno. EV-92-19  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering  aThesis (M.Eng.) - Asian Institute of Technology, 1992  aAn integrated approach of de scribing the s ubstrate removal in  a facultative pond by s u s p ende d b i omass in the pond liquid and  biomass attached to the inner walls and pond bottom (biof ilm) was  attempte d. Mathematical models were developed to combine the  effect s of s uspe nded biomass and biof ilm on t h e s ubstr ate remova l  kinetics. Monod kinetics a nd first order kine tics were u sed in four  different combi nations in developing t he mode l s.  Batch experime n ts were conducted to determine the kinetic  coefficients for suspended biomass and biofilm separately. It was  found from t h e study t h at t h e maximum substrate utilization rates ,  under the conditions of facultative pond, were approximately 8  times l ower than the typical valu e report ed i n t h e literature for  activated s ludge process.  The de ve lope d mode l s were tested with the data obtained from  a n AIT facultative pond, a nd a facultative pond l ocated i n New  Mex i co , USA, moni tored for one year . It was found from the study  that, the efflu e n t BOD5 predicted from the mode l u sing f irst order  kinetics for both s u spended biomass and biofilm, fits reasonably  we ll with the experimental data from a facultative pond of AIT  campus and a pond of Ne w Mexico, U.S . A.  A design c hart was prepared based on the model using first  order kinetics for both s u spended biomass and biofilm. An examp l e  was included t o design a f acultative pond based on BOD5 remova l  efficiency and incorporating t h e e ffect of biof ilm in the design  procedure.  0aSewage lagoonsxMathematical models0 aChongrak Polprasert,eChairperson1 aSchroder, Hans,eExamination committee1 aVisvanathan, C.,eExamination Committee2 aCIDA,eScholarship donor  2 aAsian Institute of Technology.tThesis ;vno. EV-92-19  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B16653