滤料粒径对给水曝气生物滤池运行稳定性的影响

利用给水曝气生物滤池(UBAF)处理刘屋洲水源水,考察了不同陶粒粒径对氨氮、高锰酸盐指数的去除效果以及水头损失变化的影响。结果表明,陶粒3～5 mm的UBAF对氨氮、高锰酸盐指数的去除效果较高,但是其水头损失较大,且反冲洗前后水头损失变化偏大,不利于UBAF稳定运行。陶粒6～10 mm的UBAF运行状况良好,氨氮的去除率为73.8%,高锰酸盐指数的去除率为18.6%,滤池24 h过滤水头损失<0.4 m,反冲洗前后过滤水头损失变化量<5 cm。其出水氨氮和高锰酸盐指数均达到《生活饮用水卫生标准》(GB5749-2006),滤池的水头损失小,反冲洗前后也变化甚微。进一步的实验表明陶粒破碎会导致滤料粒径级配变化,使得水头损失增加。

Influence of media size on operational stability of UBAF

Up biological aerated filter(UBAF) was applied for the treatment of source water in Liuwuzhou.Effect of media size on the variation of head loss as well as the removal efficiency of NH3-N and CODMn was evaluated.The results showed that UBAF with media size between 3 and 5 mm was suitable for the removal of NH3-N and CODMn.However,because of the great head loss which also varied significantly before and after back wash,this media size was not favorable for UBAF operation.UBAF with media size between 6 and 10 mm made good performance,and the removal efficiencies of CODMn and NH3-N were 73.8% and 18.6%,respectively,which meet the requirement of the Sanitary Standard for Drinking Water(GB5749-2006).The head loss was low(below 0.4 m) after operating for 24 h.And the variation of head loss before and after back wash was minimal(below 5 cm).Additional test demonstrated that media broken might result in the change of size gradation and the head loss increased subsequently.