Affiliations: School of Environmental Science and Engineering,
Tongji University, Shanghai 200092, China. E-mail: [email protected]
Abstract: 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 COD_Cr, 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 meas of COD_Cr, BOD_5, NH_3-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.