桂林第四污水处理厂A-A/O工艺生物除磷试验研究

Study on Biological Phosphorus Removal with A-A/O Process in Guilin Fourth Sewage Treatment Plant

以桂林第四污水处理厂A A/O工艺处理水为试验对象 ,研究了生物除磷过程中生物厌氧放磷和好氧吸磷的规律。结果表明 ,硝酸盐的浓度≥ 5mg/L对生物除磷有明显抑制作用 ;生物厌氧放磷时间在 4～ 8h外源放磷量呈线性增加 ;曝气吸磷时间在 1～ 3h生物吸磷速率较快 ;厌氧 5h再曝气 2h吸磷量最大 ,且单位污泥最大比吸磷量为 3 .3 5× 1 0 -6,此时的耗氧速率为 0 .1 63mg/L·min。

The anaerobic anoxic oxic (A A/O) process was utilized to study the principle of biological phosphorus removal.The results were as follows:the phosphorus removal was significantly inhibited by nitrate salt when its concentration was larger than 5mg/L;the phosphorus release increased linearly when the biological anaerobic phosphorus release time was set between 4～8 hours;the rate of phosphorus accumulation was rapid when the aeration phosphorus accumulation time was set between 1～3 hours It was also found that the maximum phosphorus accumulation occurred after 5 hour anaerobiosis followed by 2 hour aeration when the maximum capacity of unit sludge amounts to 3.35×10 -6 and the rate of oxygen comsumption then was 0.163mg/Lmin.