Tetrasodium iminodisuccinate as a biodegradable complexing agent for remediating metal‐contaminated soil

Abstract

Soil washing is a rapid and cost-effective method to treat contaminated soils. However, conventional chelating agents exhibit adverse environmental effects.Tetrasodium iminodisuccinate (IDS) is a new type of amino carboxyl chelating agent, which exhibits strong chelating performance, high solubility in aqueous solution, and is environmentally friendly in soil. In this study, batch washing of Cu, Pb, and Cd removal from simulated contaminated soil and real project-scale soil of a Pb-polluted field was explored to evaluate the application of IDS in the remediation of potentially toxic metal-contaminated soil. The effects of the IDS solution pH, concentration, reaction temperature, liquid/soil (L/S) ratio, number of washing cycles, and contact duration were investigated, and the optimal conditions were identified as follows: pH 7, IDS concentration 10 mmol Á L À1 ,