Leaching Remediation of Dredged Marine Sediments Contaminated with Heavy Metals

There are more than 150 ports in China and a considerable proportion of dredged sediments waterways contaminated with heavy metals as the typical contaminants. It is mandatory to remediate prior further resource utilization. The over-arching objective this study was use natural organic acids (oxalic acid, citric tartaric malic acid) leaching agents remove (Cu, Cd, Pb) from sediments. Batch experiments were conducted investigate factors governing removal rate kinetics. Citric acid had best effect on Cu, Pb an optimal concentration 20 mmol/L solid-to-liquid ratio 1:20. average rates 85%, 73%, 56%, 35% for oxalic respectively. kinetics showed that increased rapidly time then gradually reached maximum value which described by Elovich equation model. outcomes suggest effective environmentally friendly agent removing marine