Influence of the wastewater composition on denitrification and biological p-removal in the S-DN-P-process (b) Effect of acetate.
The effect of acetate was examined during the p-removal and denitrification of wastewater. The plant was operated based on the sequencing-batch-biofilm-reactor (SBBR) process. As microbial media, ca. 9 mm Bio-Flow granules made from polyethylene and polypropylene were used. Three preparations were made to compare the level of biological p-removal and denitrification. In comparison to the batch test, 42 mg/L (AC 30) and 84 mg/L (AC 60) of NaCH(3)COO were mixed with the 500 mL of raw wastewater and the effect of the acetate concentration on the level of p-removal was monitored. All samples were immediately filtered with 0.45 microm membrane filter, and PO(4)-P, NO(3)-N, NO(2)-N and acetate were analyzed using Ion Chromatography, whereas P(total) and chemical oxygen demand (COD) were measured by a spectrophotometer. The p-removals for the WW, WW+AC 30 and WW+AC 60 preparations were found to be 9.4, 9.1 and 13.1mg/L, respectively. The WW+AC 30 preparation did not show any significant effect on the p-removal, while p-removal in WW+AC 60 preparation was higher than that in the other two preparations. A comparison of the data revealed the COD: NO(3)-N:AC:P ratio of the WW, WW+AC 30 and WW+AC 60 preparations to be 18.07:2.90:6.87:1, 21.28:2.45:5.98:1 and 15.95:2.75:6.18:1, respectively. The experimental results showed that approximately 7 mg/L of acetate was consumed per 1mg/L of p-removal.
Choi
Hee-Jeong
HJ
Department of Environmental Engineering, Kwandong University, Gangnung, Republic of Korea.
Lee
Seung-Mok
SM
Choi
Chul-Ho
CH
Kwon
Min-Chul
MC
Lee
Hyeon-Yong
HY
D019342:Acetic Acid / Q000378:metabolism*; D018441:Biofilms; D019149:Bioreactors; D017672:Nitrogen Compounds / Q000378:metabolism*; D010100:Oxygen / Q000737:chemistry; D017553:Phosphorus Compounds / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods
D017672:Nitrogen Compounds; D017553:Phosphorus Compounds; D012722:Sewage; D019342:Acetic Acid; D010100:Oxygen