容积负荷对悬浮载体生物流化床处理效果的影响

Influence of COD Volume Loading on Pollutant Removal Efficiency in Suspended Carrier Biological Fluidized Bed Reactor

采用悬浮载体生物流化床工艺处理城市生活污水，考察了容积负荷对其处理效果的影响。结果表明，当容积负荷〈15kgCOD／（m^3·d）时，系统对COD的去除率变化不大，平均为93．16％，当容积负荷〉15kgCOD／（m^3·d）时，虽然系统对COD的平均去除率仍有85．15％，但出水平均COD已达195．39mg／L，不能满足《污水综合排放标准》（GB8978-1996）的要求；系统对氨氮的去除率随容积负荷的增加呈下降趋势，当容积负荷为1～25kgCOD／（m^3·d）时，系统出水氨氮平均浓度为9．69mg／L；系统对TN的去除率先随容积负荷的增加而增加，当容积负荷〉17kgCOD／（m^3·d）后，则随容积负荷的增加而下降，当容积负荷为15～17kgCOD／（m^3·d）时，系统对TN的去除效果最佳。综合考虑，当容积负荷为15kgCOD／（m^3·d）时，悬浮载体生物流化床工艺的除污效果较好。

The influence of different COD volume loading on removal efficiency of urban domestic sewage in suspended carrier biological fluidized bed reactor was investigated. The result shows that the average removal efficiency of COD is 93.16% when the volume loading is less than 15 kgCOD/（m^3·d）. When the volume loading is more than 15 kgCOD/（ m^3·d） , the removal efficiency is still 85.15% , but the effluent COD concentration is 195. 39 mg/L and can not meet the requirement of Integrated Wastewater Discharge Standard （ GB 8978 - 1996 ）. With the increase of volume loading, the removal efficiency of ammonia decreases. The average effluent ammonia concentration is 9.69 mg/L when the volume loading ranges from 1 to 25 kgCOD/（m^3·d）. The removal efficiency of total nitrogen increases first with the volume loading increase. When the volume loading is more than 17 kgCOD/（ m^3·d）, the removal efficiency of total nitrogen decreases. When the volume loading ranges from 15 to 17 kgCOD/（ m^3·d）, the removal efficiency of total nitrogen is the best. In conclusion, the suspended carrier biological fluidized bed reactor has better pollutant removal efficiency when the volume loading is 15 kgCOD/（m^3·d）.