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Effects of Potassium and Magnesium in the Enhanced Biological Phosphorus Removal Process Using a Membrane Bioreactor
Author(s) -
Choi HeeJeong,
Yu SungWhan,
Lee SeungMok,
Yu SeungYoung
Publication year - 2011
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143010x12851009156808
Subject(s) - chemistry , magnesium , potassium , phosphorus , anaerobic exercise , enhanced biological phosphorus removal , anoxic waters , calcium , membrane bioreactor , phosphate , bioreactor , inorganic chemistry , membrane , nuclear chemistry , chromatography , environmental chemistry , activated sludge , biochemistry , wastewater , environmental engineering , organic chemistry , physiology , engineering , biology
This study assessed the role of potassium (K + ), magnesium (Mg 2+ ), and calcium (Ca 2+ ) ions in the enhanced biological phosphorus removal (EBPR) from wastewaters using a membrane bioreactor (MBR). A linear relationship in the anaerobic and aerobic/anoxic phases for P uptake versus P release was obtained using the known equation Δ P uptake = a × Δ P release + b, where the constants “a” and “b” were found to be 0.44 and 8.40, respectively. Both potassium and magnesium were soluble with phosphate in the anaerobic phase, but they accumulated again during the successive aerobic/anoxic phase. The linear correlation coefficients ( R 2 ) of K + /PO 4 ‐P and Mg 2+ /PO 4 ‐P were calculated as 0.6682 and 0.8884, respectively. The molar ratio of C K/P during anaerobic phosphorus release was observed to be 0.20 mol/mol, whereas C Mg/P was 0.21 mol/mol. Furthermore, unlike potassium and magnesium, calcium was not co‐transported with phosphorus during the release and uptake processes.