Influence of wastewater composition on denitrification and biological P-removal in the S-DN-P-process: effects of different substrates (a).
The influence of the wastewater composition on the denitrification and biological P-elimination in the Sorption Denitrification P-eliminations Process (S-DN-P-process) was examined. Batch type experiments were performed to examine the influence of various substrates. Among the three different substrates prepared, only 11% COD(filt) was taken up from starch containing wastewater (starch preparation). Acetate is an easily degradable substrate for the biological P-elimination, and showed ca. 30% more acetate was taken up compared to the raw wastewater (wastewater preparation). Starch is a barely degradable substance, because it must be hydrolysed before digestion. Starch initially sorbs slowly (approximately 30 min), and may be hydrolysed during this time. During the investigations, the biological P-elimination and the denitrification were found to be dependent on the wastewater composition. The P-elimination rate was determined to be 38% with the acetate preparation, while a P-elimination of 6% was obtained with the starch preparation. The wastewater preparation showed a P-elimination of 56%, the value of which was almost 18% more than the acetate preparation. The biological P-elimination and denitrification depend not only on the dissolved parts in the wastewater, but also on the undissolved content.
Choi
Hee-Jeong
HJ
Department of Environmental Engineering, Kwandong University, 522 Naegok-dong, Gangwon-do 210-710, South Korea.
Choi
Chul-Ho
CH
Lee
Seung-Mok
SM
D000327:Adsorption; D019149:Bioreactors; D009566:Nitrates / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism*; D013379:Substrate Specificity; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification
D009566:Nitrates; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen