Laboratory Services, Sydney Water, 51 Hermitage Road, West Ryde, NSW, 2114, Australia.
CSIRO Environment, Locked Bag 2007, Kirrawee, NSW, 2232, Australia.
Environ Sci Pollut Res Int. 2023 Sep;30(43):96763-96781. doi: 10.1007/s11356-023-29152-x. Epub 2023 Aug 15.
Four representative sites in the greater city of Sydney, Australia, were selected for a study of the wet-weather overflow of sanitary (separate to stormwater) sewerage systems. Water samples were collected by autosamplers from up to eight wet weather overflow events over 16 months and from companion receiving water sites. The objective was to identify the risks posed by sewage contaminants to aquatic biota in the receiving waters, to aid in prioritising management actions. Twelve organic contaminants were identified in influents across the four sites under rainfall ingress diluted conditions, with measurements showing that the highest concentrations were restricted to the anti-inflammatory acetaminophen and the diabetes medication metformin. Lesser contaminants included theobromine, ibuprofen, sucralose, and three benzotriazoles (mainly 1-H benzotriazole). An assessment of the toxicity of the identified organic chemicals indicated that none appeared to pose concerns for ecosystem health before wet-weather ingress dilution, and this was even less likely after dilution in the receiving waters. Metal concentrations were low; however, ammonia concentrations in the influent did pose a risk to ecosystem health, although receiving water dilution diminished this risk at four of the five receiving water locations studied.
选择澳大利亚大悉尼市的四个代表性地点，研究卫生（与雨水分开）下水道系统的雨天溢流情况。在 16 个月的时间里，通过自动采样器从多达 8 次雨天溢流事件和相应的受纳水体地点收集水样。目的是确定污水污染物对受纳水体中水生生物群的风险，以便为管理行动确定优先级。在四个地点的进水条件下，有 12 种有机污染物被识别出来，测量结果表明，最高浓度仅限于抗炎药对乙酰氨基酚和糖尿病药物二甲双胍。较小的污染物包括可可碱、布洛芬、三氯蔗糖和三种苯并三唑（主要是 1-H 苯并三唑）。对所识别的有机化学品的毒性评估表明，在雨天进水稀释之前，没有一种化学品似乎对生态系统健康构成威胁，而在受纳水体中稀释后，这种可能性更小。金属浓度较低；然而，进水氨浓度确实对生态系统健康构成风险，尽管在研究的五个受纳水体地点中的四个地点，受纳水体的稀释降低了这种风险。
