中文摘要：

以西安市某再生水厂出水作为水源，采用4个CDC生物膜反应器，通过串联模拟回用水管网中生物膜的特征及其对铁、锰的富集。结果表明，回用水管道单位表面积累的生物膜量沿程按幂指数关系递减；生物膜中的异养茵数量沿程减少，其在HRT〈25min区段的数量最多，平均为302CFU／m^2。同时，回用水管道生物膜的溶解态EPS含量沿程先增大再减小，而结合态EPS含量则沿程递减，其中蛋白质／多糖值在前者中为0．91～1．29，在后者中为3．18～3．91。此外，模拟回用水管道中分布最多的为锰，其次是铁，其中锰在第2个反应器中的质量分数最高，达到生物膜总量的53．9％。

英文摘要：

Four CDC biofilm reactors were connected in series to model a pipe network fed with reclaimed water from a wastewater treatment and reuse plant （WTRP） located in Xi＇ an. The biofilm characteristics and enrichment of iron and manganese in the pipe network were investigated. The results indicated that the accumulative biofilm biomass on specific area decreased exponentially along the flow course. ;I＇he heterotrophic bacteria in the biofilm diminished along the flow course, and their number reached an average of 302 CFU/m2 in the zone where HRT was below 25 minutes. At the same time, the soluble extracellular polymeric substances （EPS） in the biofilm on pipe walls first increased and then decreased while the bound EPS dwindled along the flow course. The ratio of protein to polysaccharide was 0.91 to 1.29 in soluble EPS and 3.18 to 3.91 in bound EPS. Manganese was the dominant element in the biofilm, followed by iron. Manganese had the largest mass fraction in the second reactor, accounting for 53.9% of the total biofilm.