|
KMID : 1094720090140010099
|
|
Biotechnology and Bioprocess Engineering
2009 Volume.14 No. 1 p.99 ~ p.104
|
|
|
Effect of Organic Loading Rate on the Performance of an Up-Flow Anaerobic Sludge Blanket Reactor Treating Olive Mill Effluent
|
|
Nuri Azbar
Fatih Tutuk
Tugba Keskin
|
|
|
Abstract
|
|
|
|
The primary objective of this study was to evaluate the effects of the organic loading rate on the performance of an up-flow anaerobic sludge blanket (UASB) reactor treating olive mill effluent (OME), based on the following indicators: (i) chemical oxygen demand (COD) removal efficiency; and (ii) effluent variability (phenol, suspended solids, volatile fatty acids, and pH stability). The UASB reactor was operated under different operational conditions (OLRs between 0.45 and 32 kg COD/m3·day) for 477 days. The results demonstrated that the UASB reactor could tolerate high influent COD concentrations. Removal efficiencies for the studied pollution parameters were found to be as follows: COD, 47~92%; total phenol, 34~75%; color, 6~46%; suspended solids, 34~76%. The levels of VFAs in the influent varied between 310 and 1,750 mg/L. Our measurements of the VFA levels indicated that some of the effluent COD could be attributed to VFAs (principally acetate, butyrate, iso-butyrate, and propionate) in the effluent, which occurred at levels between 345 and 2,420 mg/L. As the OLRs were increased, more VFAs were measured in the effluent. A COD removal efficiency of 90% could be achieved as long as OLR was kept at a level of less than 10 kg COD/m3·day. However, a secondary treatment unit for polishing purposes is necessary to comply with discharge standards.
|
|
|
KEYWORD
|
|
|
olive mill effluent, up-flow anaerobic sludge blanket reactor, organic loading rate, effluent variability
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
 
|
|