厌氧－缺氧－好氧工艺去除废水中COD、氮和磷的研究

Study on COD, N and P removal from wastewater using AN-AN-OX process

为了减少废水中营养盐的排放量，采用实验室规模的厌氧─缺氧─好氧工艺处理豆制品废水。结果表明，ＴＣＯＤ、ＳＣＯＤ、ＮＨ＋Ｎ、ＮＯ－Ｎ、ＴＮ、ＴＰ、ＳＰ（可溶性磷）、ＳＳ、细菌总数和大肠菌群数的去除率分别为９６％、９４％、９３％、８９％、８２％、８８％、７８％、９８．０％、９９．９％以上。厌氧相产气率平均０．４Ｌ／Ｌ·ｄ，上所产气体中平均甲烷含量６９．８％，ＣＯ２３．８％，Ｎ２２６．４％。缺氧相产气率平均为０．２Ｌ／Ｌ·ｄ，平均甲烷含量５９．５％，ＣＯ２１．２％，Ｎ２３９．２％。好氧相中亚硝酸细菌含量为１．１×１０５／ｍＬ，硝酸细菌含量为１．４×１０３／ｍＬ。

lab-scale AN-AN-OX process was carried out to treat soybean cake wastewater in order to demonstrate it's ability of COD,N and P removal.The results indicated that the removal efficiency of TCOD,SCOD,NH4-N,NO3-N,TN,TP,SP and SS was 96%,94%,93%,89%,82%,88%,78%,and 98% respectively.The removal rate of the total number of bacteria and coliform group was above 99.9%.The average gas production rate in anaerobic phase was 0.4L/L.d,average methane,CO2 and N2 content in the gas was 69.8%,3.8% and 26.4% respectively.The average gas prodution rate in the anoxic phase was 0.2L/L·d,average methane,CO2 and N2 content in the produced gas was 59.5%,1.2% and 39.2% respectively.The number of nitrosomonas and nitrobacter in the aerobic phase was 1.1×105/mL and 1.4×103/mL respectively.