Effect of Mg/Ca molar ratios on characteristics of anaerobic-anoxic denitrifying dephosphatation

Journal article (2017)

Authors

W. Tian Southern University of Science and Technology
C. Ma Tianjin Polytechnic University, University of Connecticut
Y. Lin BT/Environmental Biotechnology - AS
Z. L. Ran ShenZhen Institute of Information Technology
Research Group
BT/Environmental Biotechnology (AS) (TU Delft)
Anaerobic-anoxic denitrifying dephosphatation Enhanced Biological Phosphorus Removal (EBPR) Extracellular Polymeric Substances (EPS) Mg/Ca molar ratios
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Published Date

2017

Language

English

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Faculty

Applied Sciences

Department

BT/Biotechnologie

Research Group

BT/Environmental Biotechnology

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.