y mansouri - department of analytical chemistry faculty of chemistry razi university , kermanshah
A.A.L zinatizadeh - department of applied chemistry faculty of chemistry razi university kermanshah iran
a akhbari - department of analytical chemistry faculty of chemistry razi university , kermanshah
m irandoust - department of analytical chemistry faculty of chemistry razi university , kermanshah

Biokinetics coefficients in an innovative time -based control up-flow aerobic/ anoxic sludge fixed film UAASFF bioreactor treating a synthetic wastewater were estimated. An experimental unit with working volume 2.5 I consisted of tow main sections , bottom upflow activated sludge reactor and middle fixed film FF reactor. the UAASFF bioreactor was tested under different operating conditions by changing three independent variables HRT,COD:N:P ratio and aeration time. throughout the experiment the removal efficiency of TCOD was between 59.4 and 93.6% . in order to the kinetic analysis of organic removal different kinetic models monod , first - order second -order and stover -kincannon models were examined.