It is possible to distribute drinking water without a disinfectant residual when the treated water is biologically stable. The objective of this study was to determine the impact of easily and slowly biodegradable compounds on the biostability of the drinking water at three full-scale production plants which use the same surface water, and on the regrowth conditions in the related distribution systems. Easily biodegradable compounds in the drinking water was determined with AOC-P17/Nox during 2012–2015. Slowly biodegradable organic compounds measured as particulate and/or high-molecular organic carbon (PHMOC), were monitored at the inlet and after the different treatment stages of the three treatments during the same period. The results show that PHMOC (300–470 μg C L⁻¹) was approximately 10% of the TOC in the surface water and was removed to 50–100 μg C L⁻¹. The PHMOC in the water consisted of 40–60% of carbohydrates and 10% of proteins. A significant and strong positive correlation was observed for PHMOC concentrations and two recently introduced bioassay methods for slowly biodegradable compounds (AOC-A3 and biomass production potential, BPC₁₄). Moreover, these three parameters in the biological active carbon effluent (BACF) of the three plants showed a positive correlation with regrowth in the drinking water distribution system, which was assessed with Aeromonas, heterotrophic plate counts, coliforms and large invertebrates. In contrast, the AOC-P17/Nox concentrations did not correlate with these regrowth parameters. We therefore conclude that slowly biodegradable compounds in the treated water from these treatment plants seem to have a greater impact on regrowth in the distribution system than easily biodegradable compounds.

当处理后的水在生物学上稳定时，可以分配饮用水而没有残留的消毒剂。这项研究的目的是确定容易和缓慢降解的化合物对三个使用相同地表水的大规模生产工厂的饮用水的生物稳定性的影响，以及对相关分配系统中再生条件的影响。在2012–2015年期间，使用AOC-P17 / Nox确定了饮用水中易于生物降解的化合物。在同一时间段内，在三种处理的进口处以及不同处理阶段之后，对以颗粒和/或高分子有机碳（PHMOC）形式测量的可缓慢生物降解的有机化合物进行了监测。结果表明，PHMOC（300–470μgCL ^-1）约为表层水中TOC的10％，并去除至50–100μgCL ^-1。水中的PHMOC由40–60％的碳水化合物和10％的蛋白质组成。观察到PHMOC浓度具有显着且强的正相关性，最近还发现了两种可缓慢降解的化合物的生物测定方法（AOC-A3和生物质生产潜力，BPC ₁₄）。此外，这三种植物的生物活性炭流出物（BACF）中的这三个参数与饮用水分配系统中的再生长呈正相关，并通过气单胞菌进行了评估。，异养平板数，大肠菌群和大型无脊椎动物。相反，AOC-P17 / Nox浓度与这些再​​生参数不相关。因此，我们得出的结论是，这些废水处理厂处理后的水中缓慢可生物降解的化合物似乎比易生物降解的化合物对分配系统中的再生长有更大的影响。