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Sewer overflows spike chemicals in marine harbours
In two protected English harbours, CSO discharge days raised mixed chemical burdens 25- to 43-fold above a dry-spring baseline, with imidacloprid exceeding PNEC.
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What pollution pathway was targeted?
Combined sewer overflows into protected marine harbours, plus WWTP effluent.
Source: Chemical profiling of surface water and biota in protected marine harbours impacted by combined sewer overflows · DOI · quote verified
How many pharmaceuticals were detected?
67, with 22 found at more than half the sites.
Source: Chemical profiling of surface water and biota in protected marine harbours impacted by combined sewer overflows · DOI · quote verified
What was the March concentration range?
Means from 0.12 ng/L (propamocarb) to 129 ng/L (citalopram).
Source: Chemical profiling of surface water and biota in protected marine harbours impacted by combined sewer overflows · DOI · quote verified
How much did Site 16 burden rise on CSO days?
25- to 43-fold above March, to 281.1 ng/L (August) and 167.2 ng/L (November).
Source: Chemical profiling of surface water and biota in protected marine harbours impacted by combined sewer overflows · DOI · quote verified
Which illicit-drug markers tracked CSOs at Site 16?
Benzoylecgonine (~20-fold) and cocaine (~15-fold).
Source: Chemical profiling of surface water and biota in protected marine harbours impacted by combined sewer overflows · DOI · quote verified
Did imidacloprid exceed its PNEC?
Yes, in nearly every sample; mean RQs 3.9 (March) and 3.3 (November), max 9.3.
Source: Chemical profiling of surface water and biota in protected marine harbours impacted by combined sewer overflows · DOI · quote verified
How quickly did overflow spikes fade?
Concentrations returned toward baseline within 24 hours.
Source: Chemical profiling of surface water and biota in protected marine harbours impacted by combined sewer overflows · DOI · quote verified
Were CSO-day concentrations statistically higher?
Yes; Mann–Whitney p<0.001 versus non-CSO days in August and November.
Source: Chemical profiling of surface water and biota in protected marine harbours impacted by combined sewer overflows · DOI · quote verified
What other CSO markers rose?
Bezafibrate (<2.4 to 176.7 ng/L) and sulfapyridine (<0.3 to >500 ng/L); caffeine peak areas ~100×.
Source: Chemical profiling of surface water and biota in protected marine harbours impacted by combined sewer overflows · DOI · quote verified
Why was March a useful baseline?
An unusually dry spring with Havant rainfall 32% below the long-term average.
Source: Chemical profiling of surface water and biota in protected marine harbours impacted by combined sewer overflows · DOI · quote verified