Effects of Different Heat Treatment Methods on Organic Pollutants and Heavy Metal Content in Oil Sludge Waste and Ecotoxicological Evaluation

The discharge of large amounts oily sludge heat treatment residues constitutes a severe threat to the environment. However, little is known about toxicity these heat-treated residues. Current research has mainly focused on toxic effects single heavy metals or hydrocarbons plants, whereas phytotoxic hydrocarbon–metal mixtures have remained largely unexplored. In this study, pot experiments were conducted evaluate different proportions (pyrolysis, heat-washing, and high-temperature oxidation residues) from three kinds physiological biochemical parameters mung bean plants. Higher decreased germination rates enzyme activity beans compared uncontaminated soil. When pyrolysis residue, hot-washing thermal residue are used in green planting soil, their content must be lower than 30%, 90%, 70%, respectively. Additionally, our findings indicated that accumulation level pollutants was not high. exhibited degrees plant toxicity. still strong ecotoxicity, even at low concentrations. contrast, much residue. Our highly tolerant contaminated soil therefore well suited for phytoremediation applications.