The ecotoxicological risk assessment methodologies developed up to now mainly focus on local pollution and do not incorporate an evaluation and prioritization of the different risk situations present in the same territory. This article presents the different phases of formulating an innovative methodology developed to fill this gap, and its application to all the 18 WasteWater Treatment Plants (WWTP) of a geographical area located northeast of Lyon, France. The aim was also take into account emerging pollutants that are very often “forgotten” in ecotoxicological risk assessments. The results of the study show the extreme diversity of the ecotoxicity of the pollutants present in discharges, with “minimum” PNEC values in the region of a millionth of a microgram (10^-6 μg/l) and “maximum” PNEC values in the region of several tens of micrograms. They also show very considerable diversity of the flows of the receiving watercourses in the territory concerned (from several m³/s to 600m³/s). The Risk Quotients (RQ) resulting from these 2 datasets, calculated for each WWTP and for each of the 10 pollutants most implicated in ecotoxicological risks (Diclofenac, Amoxicillin, Trimethoprim, Roxithromycin, 17β-estradiol, 17α-Ethynylestradiol, Estrone, Nonylphenol, Octylphenol, Nickel, et NH₄⁺), vary from 0.000002 to 187.7 when using the median concentration values of these pollutants, and from 0.000007 to 3750 when using their maximum concentration values. Globally, they show that: (1) the risks are higher for small streams that receive WWTP discharges of average size, (2) the risks are low to very low for discharges into watercourses with high flow rates.

中文翻译：

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在一个领土范围内识别，评估和确定生态毒理风险的优先级：适用于法国里昂东北部某地理区域的污水处理厂排放

迄今为止开发的生态毒理学风险评估方法学主要集中于当地污染，并未纳入对同一地区不同风险情况的评估和优先级划分。本文介绍了制定填补这一空白的创新方法的不同阶段，并将其应用于法国里昂东北部地理区域的所有18个废水处理厂（WWTP）。目的还考虑到了在生态毒理风险评估中经常被“遗忘”的新兴污染物。研究结果表明，排放物中所含污染物的生态毒性具有极大的多样性，PNEC值的“最小”范围为百万分之一微克（10 ^-6μg/ l）和“最大” PNEC值在几十微克的范围内。它们还表明，有关领土内接受水道的流量非常多样（从几m ³ / s到600m ³ / s）。由这两个数据集得出的风险商（RQ），是针对每个污水处理厂以及与生态毒理风险最相关的10种污染物（双氯芬酸，阿莫西林，甲氧苄啶，罗红霉素，17β-雌二醇，17α-乙炔雌二醇，雌酮，壬基酚，辛基酚） ，镍等NH ₄ ⁺），使用这些污染物的中位浓度值时从0.000002到187.7，使用最大污染物值时从0.000007到3750。从全球范围来看，它们表明：（1）接收平均大小的WWTP排放的小溪流的风险较高；（2）对于高流速的河道排放的风险低至非常低。