A comparison of the performance of mesophilic and thermophilic anaerobic filters treating papermill wastewater

PubMedID: 17223557Two anaerobic filters, one mesophilic (35 °C) and one thermophilic (55 °C), were operated with a papermill wastewater at a series of organic loadings. The hydraulic retention time (HRT) ranged from 6 to 24 h with organic loading rates (OLR) 1.07-12.25 g/l per day. At loading rates up to 8.4 g COD/l d, there was no difference in terms of the removal of soluble COD (SCOD) and gas production. At the higher organic loading rate, the SCOD removal performance of thermophilic digester was slightly better compare to mesophilic digester. Similar trend was also observed in terms of the daily methane production. The stability of thermophilic digester was also better than mesophilic digester particularly for the higher organic loadings. Volatile fatty acid accumulation was observed in the effluent of the mesophilic filter at the higher organic loading rates. The Stover-Kincannon model was applied to both digesters and it was found that model was applicable to both digesters for papermill wastewater. KB and Umax constants from the Stover-Kincannon model were also derived. © 2006 Elsevier Ltd. All rights reserved.KAP2002MMF30This work was supported by British Council in Turkey and Cukurova University Research Fund under the contract of KAP2002MMF30. Authors acknowledge helpful discussion and contribution of Dr. Chris F. Forster from University of Birmingham, UK who sadly passed away on November 2003. He was a great scientist and good friend to us. His contribution and friendship will always be remembered