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Mean (n = 3;±SD) concentrations (μg L −1 ) of caffeine in wastewater collected from WWTPs that serve Barbadian communities
| Wastewater treatment plants | Caffeine (μg L −1 ) | Efficiency (%) |
|---|---|---|
| 1: Bridgetown | ||
| Influent | 15±1.2 | 99 |
| Effluent | 0.1±0.01 | |
| 2: South Coast | ||
| Influent | 43 ±2.9 | 38 |
| Effluent | 26 ±1.3 |
