Abstract
Anaerobic Baffled Reactor (ABR) is one type of high-rate anaerobic reactor equipped with aseries of baffles. This baffles plays an important role of biomass retaining, consequently, sludge retentiontime (SRT) could be operated separately from hydraulic retention time (HRT) without needs of filter ormedia packing. Three 10-liter laboratory scale ABRs with different compartment numbers (3, 6 and 8compartments) were operated with constant HRT of 24 hrs. Synthetic carbohydrate-protein wastewater wasfed to these reactors with COD loading rate of 4 g COD/l-d. The results evidently showed that thecompartmentalized structure of ABR helped retard sludge washout rate. The more compartments, the lowerof sludge washout rate was. The ratios of SRT/HRT were found as 35, 73 and 134 d/d in the reactors withthree, six and eight compartments, respectively. In addition, COD removal efficiencies were observed withpercentages of 74, 78 and 83, respectively. Moreover, studying of the microbial populations by FISHtechnique proved the existence of microbial phase (methanogens and acidogens) separation in ABR systemwith six and eight compartments, but not clearly distinguishable in three-compartment ABR.
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