Removal of Organic Matters and Nutrients by Using Bio-balls …
235
(a) Bio-balls
(b) Corn cobs
Fig. 6 COD removal efficiency with respect to operating time
at operation time of 24 h. At initial lower concentration of COD, biomass is very
active as supply of food is low. For their survival, they consume as much as organic
matter they can, which yield in higher removal efficiency. For batch-5 and bio-ball
as media, at COD concentration of 1000 mg/l, the removal efficiency is 71.3% at
operation time of 24 h. In higher COD concentration, degradation of microbes occurs
in inner layer of bio-film which is in the state of anaerobic condition. Due to high
F/M ratio, the removal efficiency is low.
Similar observation was found for corn cobs as media. In addition to it, with
increase in operation time, the removal efficiency increases for both the media.
By increasing the operation time, enough time to start the activity of the
microorganisms is provided, which yields in higher removal efficiency.
235
(a) Bio-balls
(b) Corn cobs
Fig. 6 COD removal efficiency with respect to operating time
at operation time of 24 h. At initial lower concentration of COD, biomass is very
active as supply of food is low. For their survival, they consume as much as organic
matter they can, which yield in higher removal efficiency. For batch-5 and bio-ball
as media, at COD concentration of 1000 mg/l, the removal efficiency is 71.3% at
operation time of 24 h. In higher COD concentration, degradation of microbes occurs
in inner layer of bio-film which is in the state of anaerobic condition. Due to high
F/M ratio, the removal efficiency is low.
Similar observation was found for corn cobs as media. In addition to it, with
increase in operation time, the removal efficiency increases for both the media.
By increasing the operation time, enough time to start the activity of the
microorganisms is provided, which yields in higher removal efficiency.