聚合铝铁强化A~2/O系统脱氮除磷研究

Effect analysis of biological phosphorus removal in polymeric aluminum-iron strengthened A～2/O system

摘要:

为了考察聚合铝铁强化A2/O除磷系统的处理效果和聚合铝铁对A2/O工艺生物系统的影响,实验模拟A2/O系统,并在其曝气池前段投加聚合铝铁,通过改变聚合铝铁的投加量,研究在不同投加量下,聚合铝铁强化A2/O除磷系统对TP,TN,COD的去除效果.并采用气相色谱法,分析检测反应器内污泥的PHA含量,研究聚合铝铁对聚磷菌的影响.结果表明:聚合铝铁对生物除磷有一定的影响,在该试验条件下,聚合铝铁的投加量为4mg/L(以Al计)进水时,系统对磷去除效果最好;同时聚合铝铁的投加也有助于TN和COD的去除.总磷去除率并不是随着聚合铝铁药剂的投加量增加而增加,而是由化学除磷和生物除磷共同作用决定.

Abstract:

An A2 /O system was simulated in laboratory to investigate the effect of polymeric aluminum-iron (Al-Fe) on the performance of biological system. Chemical of polymeric Al-Fe was added in the front of the aeration tank and the effect of the dosage on the removal efficiency of TP,TN,and COD was studied. PHA content in the sludge was detected by gas chromatography analysis to estimate the effect of polymeric Al-Fe on the phosphate-accumulating bacteria. The results show that polymeric Al-Fe affects the biological phosphorus removal in A2 /O system. Under the experimental conditions,the maximum phosphorus removal is obtained at the dosage of 4 mg Al/L,TN and COD removal efficiencies are improved as well with the addition of polymeric Al-Fe. It is indicated that the total phosphorus removal in the system is determined by the combination of chemical phosphorus removal and biological phosphorus removal.