珠江原水悬浮填料生物预处理中试试验研究

Pilot Study on Bio-pretreatment of Source Water with Suspended Media

采用LT型球形悬浮填料生物接触法对珠江原水进行预处理,并与固定弹性填料PWT生物接触氧化法进行对比,在相同运行条件下,LT型悬浮填料的氨氮及亚硝酸盐氮去除率要高于PWT型固定填料。研究分析了影响流化床生物反应器的几种影响因素,如水温、气水比、水力停留时间和进水氨氮浓度等,试验结果显示,悬浮填料生物接触氧化法对高氨氮原水中氨氮和亚硝酸盐氮具有较好的处理效果,去除率分别达到80.0%～90.9%,和45.4%～75.0%,对COD也有一定处理效果,去除率达到15.6%～23.2%。该系统优点较多,无亚硝酸盐积累现象、较高的氨氮去除率和氧利用率、积泥少、具有较高的比表面积,适合微生物膜的生长繁殖,另外在系统的维护管理上也相对方便。

The source water from the Pearl River was treated by bio-contact oxidation processes with a ball-shape suspended media. Compared with the fixed media PWT, the removal efficiency of ammonia and nitrite by the LT suspended media process was higher under the same conditions.The nitrogen removal efficiency in a fluidized-bed bioreactor were studied systematically, and factors affecting reactor performance were investigated,such as temperature ratio of air to liquid, hydraulic retention time, and influent ammonia concentration of inlet water. Results showed that the bio-contact oxidation process with the suspended media has lots of advantages , such as the better romoval of nitrite and oxygen consumption with removal rate of 45.5%~75.0% and 15.6%-23.2%, the high efficiency of ammonia removal （80% -90.9%）and oxygen utilization, little accumulation of sludge , higher surfaee area for biofilm grow-up and convenience for operation and maintenance.