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During bioenhanced activated carbon (BEAC) process, the inoculated bacterial communities are dynamic. For solving this problem, bacteria with biodegradability and competitive power must be isolated. DGGE profiles of BAC filter indicated that there were 4 dominant bacteria, and 2 of them could degrade organic pollutants, which were Pseudomonas sp. and Bacillus subtilis . Thirty five bacteria were isolated from BAC filter using LB medium. Target probe of Pseudomonas sp. and Bacillus subtilis were designed for testing dominant bacteria quickly. After fluorescence in situ hybridization (FISH), 5 dominant bacteria were identified and they were SRO 2 ( Pseudomonas stutzeri ) , SRO 11 ( Pseudomonas putida ), SRO 19 ( Pseudomonas pertucinogena ), SRO 20 ( Pseudomonas balearica ) and SRO 30 ( Bacillus subtilis ) , respectively. The biodegradation test of organic pollutants in Songhuajiang water showed that the 5 bacteria could degrade organic pollutants. Dehydrogenase activities in these 5 bacteria were higher than other isolates, so that these five bacteria were valuable bacterial resource for applying in BEAC process. [ABSTRACT FROM AUTHOR]

To evaluate the suitable sludge retention time (SR) in submerged membrane bio reactor (SOMBER) for drinking water treatment, two Mrs under the SR of 80 d and 20 d were run in parallel and compared in terms of the effectiveness for treating polluted raw water. The results showed that under the SR of 80 d, the removal efficiencies of SOMBER for DOC, UV254, TO, CODMN were 19.6% , 13.4%, 27.7% and 30. 7%, while those under the SR of 20 d were 21.2%, 13.2%, 29. 2% and 32.7% , respectively. Furthermore, both of the Mrs achieved over 96% of removal for influent NH3 - N. However, when the short SR (20 d) was employed, the development rate of Trans - membrane pressure in SOMBER was lower than that under hg SR (80 d). Therefore, the reduction of SR from 80 d to 20 d would not affect the effectiveness of SOMBER for treating polluted raw water, but mitigate the membrane fouling in SOMBER. With the short SR, it would be possible to dose powdered activated carbon directly in the SOMBER, in which the sludge withdrawal could be performed periodically, to maintain the sludge concentration in suitable range. [ABSTRACT FROM AUTHOR]