Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 22, No. 2 (August 2009) 107-114   

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  DAIRY WASTEWATER TREATMENT USING THREE-STAGE ROTATING BIOLOGICAL CONTACTOR (NRBC)
 
 
A. Ebrahimi and M. Asadi

School of Civil-Environmental Engineering, Babol Noshirvani University of Technology
P.O. Box 484, Babol, Iran
atieh.e@gmail.com – asadi.mostafa@gmail.com

G.D. Najafpour*

Faculty of Chemical Engineering, Babol Noushirvani University of Technology
P.O. Box 484, Babol, Iran
najafpour@nit.ac.ir - najafpour8@gmail.com

* Corresponding Author

 
( Received: November 16, 2008 – Accepted in Revised Form: December 11, 2008 )
 
 

Abstract    Dairy wastewater is enriched in organic matter (about 45-72 g/l, COD) and also contains biodegradable carbohydrates. A three-stage system, NRBC was fabricated as a bench scale unit for lab experiments, to remove organic carbon from the whey. The fabricated NRBC had several advantages, such as quick start-up, high biomass concentration and was additionally able to handle high organic loading rates. In this study, the COD removal efficiencies of 80 and 83 percent were achieved at HRT of 16 and 24 h, respectively. While the HRT was increased to 36 h, the COD removal efficiency was increased to 92 percent. High surface COD loading rate of 38-210 g COD/m2.day was achieved. The high organic loading rate of whey was successfully treated in the fabricated NRBC. The COD removal efficiency of 96 percent was achieved, while the discs surface was increased by 10 percent.

 

Keywords    Whey, Dairy Wastewater, RBC, COD Removal

 

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