不同好/厌氧区容积负荷对生物膜/颗粒污泥耦合工艺脱氮除磷的影响

Effect of Different Volume Loading of Aerobic /Anaerobic Zone on Nitrogen and Phosphorus Removal by Biofilm and Granular Sludge Coupling Process

采用自行设计的生物膜/颗粒污泥耦合反应器,研究不同好/厌氧区容积负荷对该工艺脱氮除磷的影响.试验过程中设置了3种不同的工况,每种工况的好氧区和厌氧区容积均不同,工况Ⅰ的是9.66 L和15.34 L,工况Ⅱ的分别为12.56 L和12.44 L,工况Ⅲ的是15.42 L和9.58 L.不同的好/厌氧区容积对应不同的容积负荷.结果表明,工况Ⅰ的氨氮与磷酸盐去除效果稍差,工况Ⅲ出水硝态氮较高,造成总氮去除率较低.工况Ⅱ是最佳运行条件,系统的氨氮去除率为80.63%,氮容积去除负荷为150.27 g·(m3·d)-1,COD去除率为83.24%,释磷量与吸磷量分别为7.23 mg·L-1和11.93 mg·L-1.

The effect of different aerobic /anaerobic zone volume loading on nitrogen and phosphorus removal by biological film and granular coupling process was investigated using a self-designed Biofilm / Granular sludge coupling reactor. Three operating modes were conducted in the experiment. In operating mode Ⅰ,the volume of aerobic zone was 9. 66 L,and the volume of anaerobic zone was 15. 34 L. In operating mode Ⅱ,the volume of aerobic zone was 12. 56 L,and the volume of anaerobic zone was 12. 44 L. In operating mode Ⅲ,the volume of aerobic zone was 15. 42 L,and the volume of anaerobic zone was 9. 58 L. Three operating modes expressed different volume loading of the reactor because of different aerobic / anaerobic zone. The results showed that the performance of ammonia nitrogen and phosphorus removal was a bit poor in operating modeⅠ,the effluent nitrate nitrogen was higher in operating mode Ⅲ compared with other modes,which brought the total nitrogen removal efficiency lower. The operating mode Ⅱ was optimal for nitrogen and phosphorus removal. In operating modeⅡ,the ammonia nitrogen removal efficiency was about 80. 63%,the volume loading rate of nitrogen removal was about 150. 27 g·( m3·d)- 1,and the COD removal efficiency was higher than 83. 24%; the amounts of phosphorus release and uptake under anaerobic conditions were 7. 23 mg·L- 1and 11. 93 mg·L- 1.