Influence of the wastewater composition on denitrification and biological P-removal in the S-DN-P process: (c) dissolved and undissolved substrates.
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 different wastewater fractions are obtained as: raw wastewater, dissolved wastewater (obtained with filtration using 0.45 microm filter), and undissolved wastewater (i.e., infiltrate obtained by above filtration). The ratio of P-release/COD(tolal)-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 difference of 36%, 34% and 30%, respectively, for raw, dissolved and undissolved wastewater.
Department of Environmental Engineering, Kwandong University, Gangneung 210-701, Korea. hjchoi@kd.ac.kr
Hee-Jeong
HJ
Choi
Chul-Ho
CH
Choi
Seung-Mok
SM
Lee
Diwakar
D
Tiwari
D001673:Biodegradation, Environmental; D018441:Biofilms / Q000254:growth & development; D019149:Bioreactors; D009566:Nitrates / Q000737:chemistry / Q000378:metabolism; D009573:Nitrites / Q000737:chemistry / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
D009566:Nitrates; D009573:Nitrites; D014874:Water Pollutants, Chemical