TY - JOUR
T1 - Phosphorus removal characteristics of a combined as-biofilm process cultured by different cod/tp ratios
AU - You, S. J.
AU - Ouyang, C. F.
AU - Chuang, S. H.
AU - Lin, S. F.
PY - 2001/1/1
Y1 - 2001/1/1
N2 - The COD/TP ratio of influent is an important parameter for the phosphorus removal in a biological nutrient removal (BNR) process. In this study, we investigated the phosphorus removal and denitrification characteristics of a combined activated sludge-biofilm process, as cultured by different influent COD/TP ratios ranged from 12 to 120. Experimental results indicated that, when COD/TP ratios exceeded 30, the removal efficiencies of COD, TN and TP were 98%, 76% and 100%, respectively. However, when the COD/TP ratios were less than 30, the COD removal efficiency still surpassed 98%, but the TP removal efficiency decreased to 41% and 31.8% when COD/TP ratios were 20 and 12. Moreover, the weight percentage of phosphorus in the sludge attained a stable value when the COD/TP ratios were below 30. The maximum weight percentage of phosphorus in the sludge was found to be about 6% and, under this condition, the critical COD/TP ratio of influent was 30 of the process under a sludge retention time of 12 days. Although the amount of accumulated PHAs per mg phosphate released (γPHA/PO4) remained stable between a COD/TP ratio of 30 to 120, it increased with a decreased of the COD/TP ratio when the COD/TP ratio was less than 30.
AB - The COD/TP ratio of influent is an important parameter for the phosphorus removal in a biological nutrient removal (BNR) process. In this study, we investigated the phosphorus removal and denitrification characteristics of a combined activated sludge-biofilm process, as cultured by different influent COD/TP ratios ranged from 12 to 120. Experimental results indicated that, when COD/TP ratios exceeded 30, the removal efficiencies of COD, TN and TP were 98%, 76% and 100%, respectively. However, when the COD/TP ratios were less than 30, the COD removal efficiency still surpassed 98%, but the TP removal efficiency decreased to 41% and 31.8% when COD/TP ratios were 20 and 12. Moreover, the weight percentage of phosphorus in the sludge attained a stable value when the COD/TP ratios were below 30. The maximum weight percentage of phosphorus in the sludge was found to be about 6% and, under this condition, the critical COD/TP ratio of influent was 30 of the process under a sludge retention time of 12 days. Although the amount of accumulated PHAs per mg phosphate released (γPHA/PO4) remained stable between a COD/TP ratio of 30 to 120, it increased with a decreased of the COD/TP ratio when the COD/TP ratio was less than 30.
KW - Biological nutrient removal
KW - COD/TP ratio
KW - Phosphorus accumulating limiting
KW - Phosphorus loading limiting
KW - Polyhydroxyalkanoates
UR - http://www.scopus.com/inward/record.url?scp=0035134943&partnerID=8YFLogxK
U2 - 10.1080/09593332208618304
DO - 10.1080/09593332208618304
M3 - 期刊論文
C2 - 11286049
AN - SCOPUS:0035134943
SN - 0959-3330
VL - 22
SP - 1
EP - 6
JO - Environmental Technology (United Kingdom)
JF - Environmental Technology (United Kingdom)
IS - 1
ER -