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对含氨氮(NH_3-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NH_3-N的平均去除率为84.67%,出水NH_3-N浓度均低于0.5 mg/L,NO_2~--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NH_3-N平均浓度未达标,对NO_2~--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NH_3-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。
The micro-polluted raw water containing ammonia nitrogen (NH3-N) was treated with enhanced self-made iron oxide coated sand (IOCS) filter and bio-pretreatment combined with enhanced treatment and adsorption. The results showed that biofilm maturation was about 7 d with biofilm pretreatment and the removal rate of ammonia nitrogen was 60% -70%. However, nitrite accumulation was observed in the reactor. The average removal rate of NH_3-N was 84.67%, the concentration of NH_3-N in effluent was less than 0.5 mg / L and the content of NO_2 ~ - N tended to be 0, while the common quartz sand (RQS) Under the same conditions, the removal efficiency of ammonia nitrogen was unstable, with the average removal rate of 74.31%. The average concentration of NH_3-N in the effluent did not reach the standard, and the average removal rate of NO_2 ~ -N was only 33.29%. Under the condition of 4m / h filtration rate, the maximum removal rates of NH3-N by IOCS and RQS were 94.3% and 82.72%, respectively, in combination with biological pretreatment. The surface morphology of IOCS and RQS are obviously different: the former is more complicated and porous in surface structure, and the larger in specific surface area is more conducive to biological firm attachment; the latter is more smooth and the specific surface area is smaller.