配水系统管壁上的生物膜很有意义，因为它们会导致 氯气需求、大肠菌群生长、管道腐蚀以及水的味道和气味问题。 这项研究是AWWA研究基金会和坦帕湾水处理的一部分。 确定混合不同水源水对环境影响的合作项目 配水系统水质。该项目基于18个独立试点项目 分配系统（PDS），每个系统由不同的水混合物（7种成品水）供给 按不同比例混合）。比较的水源包括 地下水、地表水和微咸水。这些都是在各种试验中处理的 分配系统，包括反渗透（RO）（脱盐），膜和 化学软化和臭氧氧化-生物活性炭（BAC）共7 不同的成品水。这项研究的观察结果一致 结果表明，无衬里球墨铸铁比无衬里球墨铸铁更容易被生物量占据 镀锌钢、内衬球墨铸铁和PVC（按顺序）以及固定生物质 堆积更多地受支撑材料性质的影响，而不是受温度的影响 水质（包括二级残留水平）。然而，大量的液态水是可以培养的 细菌计数（即异养平板计数或HPC）不会随着细菌数量的增加而增加 生物膜累积，但迄今为止的结果表明，高HPC与低HPC相对应 消毒剂残留超过高生物膜库存。温度影响生物膜 此外，当残留量在0之间时，可同化有机碳（AOC）也很重要。 6和2.0 mg Cl2/l.An 这项工作的另一个方面是外蛋白水解活性（PEPA）的潜力 该技术与传统的所谓破坏性技术一起使用，其中 从试样表面刮去生物膜，再悬浮，并在R2A上培养 琼脂。这两种技术在PDS中给出了相似的趋势和相对比较，但 可培养生物膜值比PEPA值低几个数量级。包括16个参考文献、图表。

Biofilms on pipe walls in water distribution systems are of interest since they can lead to chlorine demand, coliform growth, pipe corrosion and water taste and odor problems. This study is part of an AWWA Research Foundation and Tampa Bay Water tailored collaboration project to determine the effect of blending different source waters on distribution systems water quality. This project is based on 18 independent pilot distribution systems (PDS), each being fed by a different water blend (7 finished waters blended in different proportions). The source waters being compared include groundwater, surface water and brackish water. These are treated in a variety of pilot distribution systems including reverse osmosis (RO) (desalination), both membrane and chemical softening and ozonation - biological activated carbon (BAC for a total of 7 different finished waters. The observations from this study have consistently demonstrated that unlined ductile iron was more heavily colonized by biomass than galvanized steel, lined ductile iron and PVC (in that order) and that fixed biomass accumulation was more influenced by the nature of the supporting material than by the water quality (including secondary residual levels). However, bulk liquid water cultivable bacterial counts (i.e. heterotrophic plate counts or HPCs) did not increase with greater biofilm accumulation, but results to date suggest high HPCs correspond with low disinfectant residual more than high biofilm inventory. Temperature affected biofilms also, and assimilable organic carbon (AOC) was important when residual was between 0.6 and 2.0 mg Cl2/l. An additional aspect of the work is that the potential of exoproteolytic activity (PEPA) technique was used along with a traditional so-called destructive technique in which the biofilm was scraped off from the coupons' surface, resuspended, and cultivated on R2A agar. Both techniques gave similar trends and relative comparisons among PDSs but culturable biofilm values were several orders of magnitude lower than PEPA values. Includes 16 references, figures.