Abstract
Soil flushing solution (SFS) from Cr(VI)-contaminated soil flushing remediation is a kind of non-industry-sourcing Cr(VI)-containing wastewater. The requirement of on-site treatment of SFS proposes high level requirements for the operational simplicity and transportability. This paper exhibits an on-site application-oriented continuous electrocoagulation (EC) system for SFS treatment. By a novel design, the products of a series of electrochemical, redox and precipitation reactions were used to create an acidic region for Cr(VI) reduction by Fe2+ and a basic region for CrxFey(OH)z precipitation. The concentrations of Cr(VI), total Cr and total suspended solids in the treated SFS were less than 0.03 mg·L−1, 0.16 mg·L−1 and 39 mg·L−1 respectively, complying with the typical environmental legislation for discharges. Experiments of stirring intensity effect shows that stirring is necessary to decrease Cr(VI)/TCr in sediments. Comparison of desorption kinetics between treated SFS and tap water shows that the Cr(VI) desorption efficiency with treated SFS is slightly higher than with fresh tap water, meeting the requirement for the reuse of SFS. Compared with other continuous EC systems, this continuous EC system eliminates the requirement of pH monitoring and adjusting and improves operational simplicity and transportability.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
