短时冲击负荷对不同粒径分布陶粒曝气生物滤池性能的影响

通过比较装有2种粒径分布（大粒径、小粒径陶粒堆积密度分别为4．5×10^2和5．4×10^2kg／m^3）的陶粒曝气生物滤池对溶解性化学需氧量（sCODCr）及NH4^＋-N、浊度的去除情况，考察短时水力冲击负荷及有机冲击负荷对不同粒径分布曝气生物滤池性能的影响。结果表明，对于2种粒径的陶粒曝气生物滤池，短时水力冲击负荷几乎不降低sCODCr及NH4^＋-N的去除率，但导致浊度去除率的下降，说明曝气生物滤池有较强的抗短时水力冲击负荷能力；短时有机冲击负荷的增大导致sCODCr及NH4^＋-N去除率的降低，但对浊度的去除却影响很小，而在解除冲击负荷后去除率很快恢复正常水平，说明大粒径滤池比小粒径滤池有较强的抗NH4^＋-N短时冲击的能力，但小粒径滤池比大粒径滤池有较强的抗sCODCr短时冲击的能力，并能保持较高的浊度去除率。

Effects of Short-time Hydraulic Loading on Organic Concentrations in BAF with Different Size Distribution Media

Through the comparison of the removal rate of sCODc, NH4^＋-N and turbidity in two biological aerated filters with two different particle size media （stacking density of big and small size are 4.5×10^2和 5.4×10^2 kg/m^3）, the effect of shorttime hydraulic loading and organics loading on the performance of BAF were studied. The results show short-time hydraulic loading has no influence on the removal of sCODCr and NH4^＋-N, but decreases the turbidity removal, which proves BAF is fitted for different hydraulic loading; short-time sCODCr and NH4^＋-N loading has severe influence on the removal of sCODCr and NH4^＋-N, but the performance returns to the normal level after no impact loading; in a word the BAF with big particle size media has better performance in NH4^＋-N than that with small particle size media, but the BAF with small particle size media has better performance in sCODCr and turbidity.