【摘要】 本文研究了Ａ２／Ｏ工艺用于处理城市污水时的脱氮、除磷效果和一些主要的影响因素。试验结果表明：Ａ２／Ｏ工艺能有效地去除有机物、氮和磷。在稳定运行条件下，ＣＯＤ去除率大于８９％，氨氮去除率在９７％以上，总氮去除率为７０～８６％，总磷去除率为８５～９６％；污水水质是影响Ａ２／Ｏ工艺除磷脱氮的主要因素，硝酸盐的存在对除磷有抑制作用，出水中的ＴＰ随回流污泥中夹带的硝酸盐浓度的增加而增加。更多还原

【Abstract】 In this paper, the removal efficiency and factors affected the anaerobic -anoxic- oxic (A2/O ) process for phosphorus and nitrogen removal from wastewater have been studied.The experimental results showed that the A2/O process is able to purify the municipal wastewater effectively’ Under the stable operating conditions , the removal of the chemical oxygen demend (COD) and the ammonia nitrogen (NH4+ -N ) were above 89% and 97%, the removal of the total nitrogen (TN ) and total phosphorus (TP) were 70 to 86% and 85 to 96 % respectively. For A2/O process, the composition of wastewater is an important factor affected phosphorus and nitrogen removal. The removal of phosphorus is imhibited in the existance of nitrate. The TP in the effluent increased with nitrate concentration in return sludge increased.更多还原