A new pressurised biofilm reactor (PBR) process with a patented disc system that enables constant biofilm control has been developed to treat concentrated wastewater with respect to easily degradable organic matter under pressures of up to 6 bar. The pressurisation enables a six-fold increase of the O2 saturation level and aeration capacity, which potentially increases the reaction rate of COD as long as O2 is limiting the reaction rate. Experiments performed in a pilot-scale PBR-reactor fed by synthetic wastewater were conducted to verify the potential and kinetics of heterotrophic conversion of O2 and acetate. Under O2-limited conditions the maximum removal rate of O2 and CODf was measured to rA,O2=60 g O2/m2/d and rA,CODf=150 g CODf/m2/d at 70 mg O2/l. Experiments verified that half-order kinetics could be applied but liquid film diffusion apparently influenced the reaction rate considerably. The observed half-order rate constant was experimentally determined to K½A,O2=7.0 (g O2)1/2m−1/2d−1 but this value is underestimated by 15% due to the observed liquid film diffusion. Based on this the intrinsic zero-order reaction rate was estimated at k0f,O2=190 kg O2/m3 biofilm/d when both liquid film and biofilm diffusion were taken into account.
Skip Nav Destination
Article navigation
Research Article|
October 01 2005
High biofilm activity under increased oxygen concentrations in a pressurised biofilm system
K.F. Janning;
*DHI – Water and Environment, Agern allé 5, DK 2970 Hørsholm, Denmark, (E-mail: [email protected]; [email protected])
E-mail: [email protected]
Search for other works by this author on:
S.N. Bak;
S.N. Bak
**Grundfos Management A/S, Poul Due Jensensvej 7, DK 8850 Bjerringbro, Denmark, (E-mail: [email protected]; [email protected])
Search for other works by this author on:
M. Andersen;
M. Andersen
**Grundfos Management A/S, Poul Due Jensensvej 7, DK 8850 Bjerringbro, Denmark, (E-mail: [email protected]; [email protected])
Search for other works by this author on:
G.H. Kristensen
G.H. Kristensen
*DHI – Water and Environment, Agern allé 5, DK 2970 Hørsholm, Denmark, (E-mail: [email protected]; [email protected])
Search for other works by this author on:
Water Sci Technol (2005) 52 (7): 69–75.
Citation
K.F. Janning, S.N. Bak, M. Andersen, G.H. Kristensen; High biofilm activity under increased oxygen concentrations in a pressurised biofilm system. Water Sci Technol 1 October 2005; 52 (7): 69–75. doi: https://doi.org/10.2166/wst.2005.0183
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
eBook
Pay-Per-View Access
$38.00