中文摘要：

对含氨氮（NH3-N）的微污染原水,采用自制氧化铁改性石英砂（iron oxide coated sand,IOCS）滤料强化过滤与生物预处理技术联合,进行强化处理与吸附效果研究。结果表明,采用强化挂膜法,生物预处理反应器的生物膜成熟期约为7 d,其对氨氮的去除率为60%-70%,但反应器中存在亚硝酸盐氮积累的现象。IOCS与生物预处理技术联合,对NH3-N的平均去除率为84.67%,出水NH3-N浓度均低于0.5 mg/L,NO2^--N含量趋于0;而普通石英砂（RQS）在同等条件下,对氨氮的去除效果不稳定,平均去除率为74.31%,出水NH3-N平均浓度未达标,对NO2^--N平均去除率仅有33.29%。在4m/h滤速工况下,与生物预处理技术联合,IOCS和RQS对NH3-N最高去除率分别为94.3%和82.72%。IOCS与RQS的表面形态结构存在明显差异：前者的表面结构更加复杂多孔,比表面积大,有利于生物牢固附着;后者表面较光滑,比表面积小,挂膜后生物易脱落。

英文摘要：

Enhanced filtration technology by using self-made iron oxide coated sands（ IOCS） was combined with biological pretreatment technology to micro-polluted raw water containing ammonia nitrogen（ NH3-N）. Strengthening treatment and adsorption property were studied. The results show that maturation time of biofilm is approximately 7 d by using enhanced biofilm culturing technique. The removal rate of pre-biotreatment to ammonia nitrogen is 60% —70%,but there is a nitrite nitrogen（ NO2^--N） accumulation in the reactor. The average removal rate of NH3-N is 84. 67% when combined with the biological pretreatment process. The residual concentration of NH3-N is below 0. 5 mg/L and that of NO2^--N tends to zero. For RQS,under the same condition,it has unstable removal efficiency to NH3-N and the average removal rate is roughly 74. 31%. The average remainder concentration of NH3-N can not reach the required standard and the removal rate of NO2^--N is only33. 29%. When filtration velocity is 4 m/h,the removal rates of NH3-N by IOCS and RQS are up to 94. 3% and82. 72%,respectively in conjunction with the biological pretreatment process. The morphological structures on the surface of IOCS and RQS are significantly different. The former has a more complex and porous surface structure,larger specific surface area,which is beneficial for the firm adhesion of microorganisms,while the later has a smoother surface,smaller specific surface area.