乙酸钠为碳源时进水COD和总磷对生物除磷的影响

研究了乙酸钠为碳源时,乙酸盐和总磷浓度对循序间歇式生物除磷工艺运行效果的影响,以及含高浓度乙酸盐废水不能有效除磷的原因结果表明:COD<600mg·L^-1时,随着COD/TP值的增大,总磷去除率提高,COD/TP<50时,磷的去除率提高显著,但当COD/TP>50时,磷的去除变化不大;进水乙酸盐浓度过高(COD>600mg·L^-1)使除磷效率逐渐下降,COD>1000 mg·L^-1会使生物除磷系统完全崩溃;研究发现除磷效率的下降是由于过多的乙酸盐从厌氧段进入了好氧段,引起丝状菌的增殖、污泥膨胀,导致聚磷菌被洗出.

Effect of the COD and Total Phosphorus Concentration on Biological Phosphorus Removal Supplied with Acetate as a Sole Carbon Source

The effect of the concentration of acetate and total phosphorus on biological phosphorus removal process in sequencing batch reactor fed with sodium acetate (as sole carbon source) was studied in this paper. The reason of the inefficiency of phosphorus removal by sludge fed with high concentration acetate solution was analyzed. The results indicated that when COD<600 mg·L^-1 the phosphorus removal increased with the increase of COD/TP; and this removal increased obviously when COD/TP<50 but not when COD/TP>50. The phosphorus removal descended at high acetate concentration ( COD>600 mg·L^-1) and broke down when COD>1000 mg·L^-1 . It is the transmissions of high acetate concentration from the anaerobic stage to the aerobic stage that led to the proliferation of the filamentous microorganism and the expansion of sludge, then polyP bacteria was wash out, which resulted in the drop of phosphorus removal.