title: A modified BAF system configuring synergistic denitrification and chemical phosphorus precipitation: Examination on pollutants removal and clogging development.
abstract: The performance of a BAF system configuring simultaneous chemical phosphorus precipitation in the pre-denitrification stage was examined using a continuously operated setup to treat real domestic wastewater. The effects of using no chemical, dosing sole Fe(2+), and dosing combined Fe(2+), PAM, and NaHCO3 in the pre-denitrification tank were assessed by monitoring COD, nitrogen, and phosphorus removal and hydraulic headloss development in the BAF column. Though dosing sole Fe(2+) significantly enhanced phosphorus removal, it would consume alkalinity through hydrolysis and form smaller-sized sludge flocs in the pre-denitrification tank, and hence resulted in affected NH4(+)-N, insoluble COD, and SS removal in the BAF. Dosing combined Fe(2+), PAM, and NaHCO3 can enhance sludge flocculation to form larger flocs and compensate alkalinity consumption. It exhibited sound performance on COD, nitrogen, and phosphorus removal, and led to less frequent BAF backwashing by slowing clogging development in the BAF filter layer.
authors: Harbin Institute of Technology Shenzhen Graduate School, Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen 518055, PR China.
authors: Hongjie
authors: H
authors: Wang
authors: Harbin Institute of Technology Shenzhen Graduate School, Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen 518055, PR China.
authors: Wengyi
authors: W
authors: Dong
authors: Space Science & Technology Institute of South China, Shenzhen 518100, PR China.
authors: Ting
authors: T
authors: Li
authors: Harbin Institute of Technology Shenzhen Graduate School, Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen 518055, PR China. Electronic address: liutongzhou@hitsz.edu.cn.
authors: Tongzhou
authors: T
authors: Liu
mesh_terms: D000332:Aerobiosis; D064751:Ammonium Compounds / Q000302:isolation & purification; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D011232:Chemical Precipitation; D058440:Denitrification; D005374:Filtration / Q000295:instrumentation*; D006863:Hydrogen-Ion Concentration; D009584:Nitrogen / Q000302:isolation & purification; D010758:Phosphorus / Q000302:isolation & purification*; D012995:Solubility; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D064751:Ammonium Compounds; D009584:Nitrogen; D010758:Phosphorus; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: BAF; Chemical phosphorus precipitation; Clogging development; Ferrous iron; Pre-denitrification