南京林业大学.doc

南京林业大学
本科毕业论文
题目:不同水力停留时间及碳氮比
对脱氮除磷效果研究
学院: 木材工业学院
专业: 环境工程
学号: 080408120
学生姓名: 尹燕飞
指导教师: 刘新
职称: 副教授
二O一二年六月
摘要
本文主要探讨了不同水力停留时间及碳氮比对污水脱氮除磷效果的研究,此实验在新型填料床-逐级曝气池一体化反应器中进行,实验中的碳源,氮源,磷源分别是葡萄糖,乙酸铵,磷酸二氢钾。主要通过改变葡萄糖的量来确定不同的碳氮比,通过改变泵的流速来改变水力停留时间。实验是通过对总氮,总磷,COD的测定来观察污水的脱氮除磷效果的。首先,先确定脱氮除磷的最佳水力停留时间,再在最佳水力停留时间确定的前提下,确定最佳的碳氮比。
结果表明:我们研究了水力停留时间分别为2h,5h,9h的脱氮除磷效率,%,%,%。%,%,%。%,30%,%。由此可以得出结论,水力停留时间越长,污水的脱氮除磷效果越好。
其次:在最佳水力停留时间确定的前提下,当碳氮比为5:1时,污水的脱氮除磷效果最佳,总氮,总磷,%,%%。
关键词:碳氮比;水力停留时间;脱氮除磷;一体化反应器;总氮;总磷;COD;

Abstract
We discuss the effect of different Hydraulic retention time(HRT) and carbon nitrogen ratio for the nitrogen and phosphorus removal in this study. This study is conducted in a new type of fixed-bed reactor (Aerated by degrees).In this study, the glucose, ammonium aceate and potassium dihydrogen phosphate were used as carbon source, nitrogen source and phosphorus source. We identify the carbon nitrogen ratio through changing the amount of glucose mainly. We ensure the hydraulic retention time by changing the flow rate of the pump. First of all, we ensure the best hydraulic retention time for nitrogen phosphorus removal. After that, we can ensure the best carbon nitrogen ratio..
As results. We study three kinds of the hydraulic retention time,2h,5h and total nitrogen, phosphorus and COD removal rate were %,%,% when were %,%,% when were %,30%,% when we can concluded that the longer hydraulic retention time, the better effect of the nitrogen and phosphorus removal
Then,after we ensure the best hydraulic retention time .the effect of the nitrogen and phosphorus removal is the best when the carbon nitrogen ratio was set as 5: total nitrogen, phosphorus, COD removal rate reached %,% and % respectively.
Keywords: carbon nitrogen ratio, Hydraulic retention time