Biological treatment of whitewater in a laboratory process in order to determine kinetic parameters for model development
Författare
Summary, in English
Implementation of an in-mill biological treatment plant is one solution to the problems associated with closure of whitewater systems. It is, however, important to operate the treatment with low concentration of nutrients in the effluent. The effect on the COD reduction from decreased additions of NH4-N and PO4-P were investigated in three parallel aerobic suspended carrier reactors during treatment at 46 to 48degreesC of whitewater from a recycled paper mill producing liner and fluting. In the reference reactor, a COD reduction of 89% was achieved and 45.6 mg NH4-N/(g COD reduced) and 11.6 mg PO4-P/(g COD reduced) was consumed at an organic load around 20 kg COD/(m(3.)d). Reduced additions of NH4-N decreased the COD reduction. Addition of 56% of the consumption of NH4-N in the reference reactor resulted in a COD reduction of 80%. The response from decreased addition of PO4-P was different compared to NH4-N but it could not be determined if this is due to unsuitable experimental design or a different reaction mechanism. Reducing the addition of PO4-P to 26% of the consumption of PO4-P in the reference reactor, decreased the COD reduction to 83%. The main conclusion from the experiment is: biological treatment has the potential of treating whitewater from recycled paper mills with low effluent nutrient concentrations.
Avdelning/ar
Publiceringsår
2004
Språk
Engelska
Sidor
195-206
Publikation/Tidskrift/Serie
Water Science and Technology
Volym
50
Issue
3
Dokumenttyp
Artikel i tidskrift
Förlag
IWA Publishing
Ämne
- Other Electrical Engineering, Electronic Engineering, Information Engineering
Nyckelord
- pulp and paper
- nutrients
- model
- aerobic degradation
- closure
- whitewater
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0273-1223