Data for: Oil sludge washing with surfactants and co-solvents: Oil recovery and toxicity of the residuals

These files include the data of a study about oil sludge washing with surfactants and co-solvents. The data presented here include the ORR (surfactant concentration effect) and toxicity (dehydrogenase activity, DHA) calculations. All the data is organised by surfactant (Triton X-100, SDS, Tween 80, rhamnolipid, and Triton X-114) and oil sludge samples (oil drilling sludge, ODS; two waste engine oil sludges obtained from two metal removal processes, gravitational settling, STS, and centrifugation, RS; oil refinery sludge, NSC; oil-water separator sludge, WSS).