title: In situ activity recovery of aging biofilm in biological aerated filter: Surfactants treatment and mechanisms study.
abstract: In situ activity recovery of aging biofilm in the biological aerated filter (BAF) is an important but underappreciated problem. Lab-scaled BAFs were established in this study and three kinds of surfactants containing sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS) and rhamnolipid were employed. Multiple indicators including effluent qualities, dissolved organic matters, biofilm physiology and morphology characteristics were investigated to explore the mechanisms. Results showed that removal rates of effluent COD in test groups significantly recovered to the level before aging. Compared with the control, effluent in SDBS and rhamnolipid-treated groups obtained more protein-like and humic-like substances, respectively. Furthermore, great live cell ratio, smooth surface and low adhesion force of biofilm were observed after rhamnolipid treatment, which was in consistent with good effluent qualities in the same group. This is the first report of applying rhamnolipid for in situ activity recovery of aging biofilm in bioreactors.
authors: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China.
authors: Qisheng
authors: Q
authors: Yu
authors: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China. Electronic address: envhuang@nju.edu.cn.
authors: Hui
authors: H
authors: Huang
authors: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China. Electronic address: hqren@nju.edu.cn.
authors: Hongqiang
authors: H
authors: Ren
authors: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China.
authors: Lili
authors: L
authors: Ding
authors: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China.
authors: Jinju
authors: J
authors: Geng
mesh_terms: D018441:Biofilms; D019149:Bioreactors / Q000382:microbiology*; D006017:Glycolipids / Q000737:chemistry; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D006017:Glycolipids; D013501:Surface-Active Agents; C418382:rhamnolipid; D012967:Sodium Dodecyl Sulfate
keywords: Activity recovery; Aging biofilm; Biological aerated filter (BAF); Rhamnolipid; Surfactant