Sorption of short- and long-chain perfluoroalkyl surfactants on sewage sludges

- The equilibrium data were well represented by the Freundlich isotherm.
- Dominant sludge parameter affecting sorption was protein rather than carbohydrate.
- The enhanced sorption of PASs on sludge was found when solution pH decreased.
- For all PASs, enhanced adsorption occurred with increasing calcium concentration.
- Sorption on sludge increases with increasing alkyl chain length for PASs with C5-C15.