三种生物除磷工艺的比较

比较了Ａ／Ｏ法、Ａ＾２／Ｏ法和ＳＢＲ法生物除磷工艺。结果表明，它们的除磷效果好；污染含磷量达６％以上、除磷系数达０．０４左右，是常规好氧生物处理的３倍。在系统除磷系数相同的条件下，Ａ＾２／Ｏ法取好，是常规好氧法的３倍；ＳＢＲ法次之，高速率Ａ／Ｏ法因不能经反硝化作用脱氮，去氮效果与常规好氧法相同。

COMPARISON OF THE THREE BIOLOGICAL PHOSPHORUS REMOVAL PROCESSES

The biological phosphorus removal processes of A/O, A2/O and SBR were compared and the results indicated that their removal effects were sound. The phosphorus concentration of the sludges was>6%,and phosphorus removal factor was about 0.04, which was two times higher than that of the resular aerobic biological treatment. For the same phosphorus removal factor,the higher the value of influent BOD5/PO43-was,the higher the phosphorus removal rate would be. The sludge in phosphorus removal system had compact structure and sound sedimentation ability. Among the three processes the nitrogen removal effect of A2/O process was the best, which was two times higher than that of the regular aerobic process, while; SBR process came second, and the short-term A/O process had the same nitrogen removal effect as that of the regular aerobic process because it could not remove nitrogen by denitrification.