Influence of the wastewater composition on denitrification and biologicalP-removal in the S-DN-P process: (c) Dissolved and undissolved substrates
Hee-Jeong Choi , Chul-Ho Choi , Seung-Mok Lee , Diwakar Tiwari
DOI:
Received September 10, 2008,Revised March 20, 2009, Accepted , Available online
Volume 21,2009,Pages 1074-1079
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The denitrification and P-removal in the sorption-denitrification-P-removal (S-DN-P) process were carried out under various
wastewater compositions. It is noted that P-removal largely depends on the wastewater composition as well to the quantity of the
substrates present in wastewater fraction. Three di erent wastewater fractions are obtained as: raw wastewater, dissolved wastewater
(obtained with filtration using 0.45 m filter), and undissolved wastewater (i.e., infiltrate obtained by above filtration). The ratio
of P-release/CODtotal-consumption clearly inferred that undissolved wastewater possess very low value i.e., 0.0008 followed by raw
wastewater 0.008 and dissolved wastewater 0.03. When this ratio was nearby 0.01, enhanced P-removal was observed. Moreover, the
ratio of P-uptake to NO3??-N decomposition for raw wastewater was two times for dissolved wastewater. Interestingly, it was observed
that the P-removal and denitrification depend not only on the dissolved substrates but also the undissolved substrates present in the
wastewater. The result of the P-removal obtained with this S-DN-P process did not show a big di erence of 36%, 34% and 30%,
respectively, for raw, dissolved and undissolved wastewater.
