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Abstract

Abstract
This research, has dealt with determination of bio-decay coefficient of activated sludge disposed from wastewater treatment plant of medical assembly in Mosul city. four bench scale reactors were used of 2.25 liter capacity for each as aerobic digestion units. Throughout the operation period which lasted for a month temperature was controlled and it was (15, 20, 25, 30) ċ in the first second third and fourth reactor respectively, the bio-decay coefficients was found as (kd15=0.02, kd20=0.03, kd25=0.04, kd30=0.05) d-1 , while the temperature constant (θ) was (1.059). Also the results showed that the required periods for aerobic digestion process to reduce 50% of biomass concentration in the reactors at digestion temperature (15, 20, 25, 30) ċ were (17, 7, 5, 4) days respectively.

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