The treatment of cheese whey wastewater by sequential anaerobic and aerobic steps in a single digester at pilot scale.
The treatment of reconstituted whey wastewater was performed in a 400 L digester at 20 degrees C, with an anaerobic digestion step, followed by a step of aerobic treatment at low oxygen concentration in the same digester. In a first set of 48 cycles, total cycle time (T(C)) of 2, 3 and 4 days were tested at varying organic loading rates (OLR). The COD removal reached 89+/-4, 97+/-3 and 98+/-2% at T(C) of 2, 3 and 4 days and OLR of 0.56, 1.04 and 0.78 g COD L(-1) d(-1), respectively. The activity of the biomass decreased for the methanogenic population, while increasing by 400% for the acidogens, demonstrating a displacement in the predominant trophic group in the biomass bed. A second set of 16 cycles was performed with higher soluble oxygen concentration in the bulk liquid (0.5 mg L(-1)) during the aerobic treatment at a T(C) of 2 days and an OLR of 1.55 g COD L(-1) d(-1), with a soluble COD removal of 88+/-3%. The biomass specific activities showed a compartmentalization of the trophic group with methanogenic activity maintained in the biomass bed and a high acidogenic activity in the suspended flocs.
Biotechnology Research Institute, National Research Council of Canada, 6100 Royalmount, Montreal, Canada H4P 2R2. jean-claude.frigon@cnrc-nrc.gc.ca
J-C
JC
Frigon
J
J
Breton
T
T
Bruneau
R
R
Moletta
S R
SR
Guiot
D000332:Aerobiosis; D000693:Anaerobiosis; D018533:Biomass; D002611:Cheese; D007220:Industrial Waste; D010865:Pilot Projects
D007220:Industrial Waste