title: Effect of Mg/Ca molar ratios on characteristics of anaerobic-anoxic denitrifying dephosphatation.
abstract: In this study, the effect of three Mg/Ca molar ratios (5.0, 3.8 and 1.7) on denitrifying phosphate removal performance, biomass morphology, and Extracellular Polymeric Substances (EPS) were examined. Results showed that when the influent Mg/Ca molar ratio was 3.8, the anaerobic-anoxic EBPR performed complete phosphate removal. The microbial bacterial population was a mixed culture comprised of 81±3% DPAO and 13±2% denitrifying glycogen accumulating organisms (DGAO). A higher influent Mg/Ca molar ratio (5.0) had a distinct impact on phosphate removal, biomass morphology, and EPS. This probably induced the deterioration of the anaerobic-anoxic Enhanced Biological Phosphorus Removal (EBPR). The results of this study may inform the proper operation of an anaerobic-anoxic EBPR, and contribute to its application in the real world.
authors.affiliation: School of Environmental Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, PR China. Electronic address: hittwd@163.com.
authors.forename: W-D
authors.initials: WD
authors.lastname: Tian
authors.affiliation: State Key Laboratory of Separation Membranes and Membrane Processes, School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, PR China; Department of Chemical and Biomolecular Engineering, University of Connecticut, 191 Auditorium Rd. Unit 3222, Storrs, CT 06269-3222, USA.
authors.forename: C
authors.initials: C
authors.lastname: Ma
authors.affiliation: Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands.
authors.forename: Y
authors.initials: Y
authors.lastname: Lin
authors.affiliation: School of Transportation and Environment, Shenzhen Institute of Information Technology, Shenzhen 518172, PR China.
authors.forename: Z-L
authors.initials: ZL
authors.lastname: Ran
mesh_terms: D018533:Biomass; D019149:Bioreactors; D010710:Phosphates; D010758:Phosphorus; D018508:Water Purification
chemical_list: D010710:Phosphates; D010758:Phosphorus
keywords: Anaerobic-anoxic denitrifying dephosphatation; Enhanced Biological Phosphorus Removal (EBPR); Extracellular Polymeric Substances (EPS); Mg/Ca molar ratios