[Effects of carbon sources, temperature and electron acceptors on biological phosphorus removal].

Effects of carbon sources,temperature and electron acceptors on phosphorus uptake and release were investigated in a pilotscale oxidation ditch. Phosphorus uptake and release rates were measured with different carbon sources( domestic sewage,sodium acetate,glucose) at 25℃. The results showed that the minimum phosphorus uptake and release rates of glucose were 5. 12mg·( g·h)- 1and 6. 43 mg·( g·h)- 1,respectively,and those of domestic sewage are similar to those of sodium acetate. Phosphorus uptake and release rates increased with the increase of temperature( 12,16,20 and 25℃) using sodium acetate as carbon sources.Anoxic phosphorus uptake rate decreased with added COD. Electron acceptors( oxygen,nitrate,nitrite) had significant effects on phosphorus uptake rate and their order was in accordance with oxygen nitrate nitrite. The mass ratio of anoxic P uptake and N consumption( Puptake/ Nconsumption) of nitrate and nitrite were 0. 96 and 0. 65,respectively.