Simultaneous nitrogen and phosphorus removal under low dissolved oxygen conditions.
A full-scale test was operated by using low dissolved oxygen activated sludge process to enhance biological nitrogen and phosphorus removal. When the influent concentrations of CODcr, TN and TP varied in a range of 352.9 mg/L-1338.2 mg/L, 34.4 mg/L-96.3 mg/L, and 2.21 mg/L-24.0 mg/L, the average removal efficiencies were 94.9%, 86.7% and 93.0%, respectively. During the test period of two months, effluent means of CODcr, BOD5, NH3-N, TN and TP were below 50 mg/L, 25 mg/L, 10 mg/L and 1.0 mg/L, respectively. The low dissolved oxygen activated sludge process has a simple flow sheet, fewer facilities and high N and P removal efficiency. It is very convenient to retrofit the conventional activated sludge process with the above process.
Xia
S Q
SQ
School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. sqxia@online.sh.cn
Gao
T Y
TY
Zhou
Z Y
ZY
D019149:Bioreactors; D002681:China; D009584:Nitrogen / Q000737:chemistry* / Q000302:isolation & purification; D010100:Oxygen / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry* / Q000302:isolation & purification; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D012722:Sewage / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
D000644:Quaternary Ammonium Compounds; D012722:Sewage; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen