specific compounds. Many researcher have reported that introduce of indigenous strains of bacteria can enhance
the degradation of organic pollutants in wastewaters. Qu et al. (2011) have found that pseudomonas spp. (isolated
from activated sludge) was very effective in removing phenol from industrial wastewater compared to the nonaugmented
one. Tuo et al. (2011) found Bacillus spp. have high ability for quinoline removal. Other work by Chen
et al. (2009) investigated the treatment of municipal wastewater with single strain of bacteria and bacterial
consortium and found that bioaugmentation with three strains of E. cloacae, Gordonia and P. putida would be
more effective in removing TOC compared with that of single strain treatments. Similar results by
Mongkolthanaruk et al. (2002) found that treatment of lipid-rich wastewater by a mixed culture of pseudomonas
aeruginosa, Bacillus sp. and Acinetobacter calcoaceticus reduced the BOD and lipid content from 3600 mg/l and
21,000 mg/l, respectively, to less than 20 mg/l within 12 days. Moreover, these 3 strains were more effective in
treatment of wastewater when compared to a single strain treatment. In other study by Schneider and Topalova
(2011) reported that municipal wastewater treatment inoculums was as efficient as commercial inoculums (namely:
hydropacks; Bilikuk and Laktazyme), in removing the COD and phenols from dairy wastewater. This work aims to
compare the bioaugmentation of municipal wastewater with indigenous and commercial bacterial strains.