Agarwalla, Binod Kumar creator Chongrak Polprasert Chairperson Schroder, Hans Examination committee Visvanathan, C. Examination Committee CIDA Scholarship donor text series technical report th Bangkok Asian Institute of Technology 1992 continuing eng 131 p. An 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. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering Thesis (M.Eng.) - Asian Institute of Technology, 1992 Sewage lagoons Mathematical models Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B16653 http://203.159.5.9/ait-thesis/detail.php?q=B16653 170399 20260817162838.0