Species and distribution of inorganic and organic phosphorus in enhanced phosphorus removal aerobic granular sludge
Journal
Bioresource Technology
Journal Volume
193
Date Issued
2018
Author(s)
Abstract
The species and distribution of phosphorus (P) in an enhanced biological phosphorus removal (EBPR)-aerobic granular sludge (AGS) were fractionated and further analyzed. Results showed that microbial cells, extracellular polymeric substances (EPS) and mineral precipitates contributed about 73.7%, 17.6% and 5.3-6.4% to the total P (TP) of EBPR-AGS, respectively. Inorganic P (IP) species were orthophosphate, pyrophosphate and polyphosphate among which polyphosphate was the major P species in the AGS, cells and EPS. Monoester and diester phosphates were identified as the organic P (OP) species in the AGS and cells. Hydroxyapatite (Ca5(PO4)3OH) and calcium phosphate (Ca2(PO4)3) were the dominant P minerals accumulated in the core of the granules. Cells along with polyphosphate were mainly in the outer layer of AGS while EPS were distributed in the whole granules. Based on the above results, the distribution of IP and OP species in AGS has been conceived. ? 2015 Elsevier Ltd.
Subjects
Aerobic granules
Enhanced biological phosphorus removal
P species
Phosphorus-31 nuclear magnetic resonance (31P NMR)
SDGs
Type
journal article