Upgrading Slaughterhouse Effluent with Rotating Biological Contactors,
ROGALAND UNIV STAVANGER (NORWAY) DEPT OF ENVIRONMENTAL ENGINEERING
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The application and start-up performance of a RBC pilot plant unit for upgrading clarified trickling filter effluent has been described. Although the operational experience has been very short, the following remarks can be made from treatment of a 10 C slaughterhouse wastewater 1 RBC process stability with respect to BOD removal was reached in approximately three weeks after start-up. The RBC-biofilm became mature relatively fast due to seeding of microorganisms from the bio-tower. 2 The hydraulic loading to the RBC was constant at 0.05 sum d whereas the organic loading varied form approximately 2 g soluble BOD sgm d to 35 g soluble BOD sgm d. A typical slaughterhouse production day organic loading is approximately 20 g soluble BOD sgm, resulting in a soluble carbonaceous BOD7 effluent concentration of approximately 35 mg1. 3 The Sapromat analysis for soluble BOD did not require seeding or dilution of the wastewater to be tested. The nitrifiers present will therefore perform immediately if other environmental conditions are satisfactor. 4 The effect of low temperature wastewater on NH3-removal could not be verified in the short time after start-up. This will be a question to answer after prolonged RBC operation.