ChelantAssisted Depollution of MetalContaminated

Authors: Ismail M M Rahman Zinnat A Begum Hikaru Sawai Masashi Ogino Yoshiaki Furusho Satoshi Mizutani Hiroshi Hasegawa

Publish Date: 2015/02/24

Volume: 226, Issue: 3, Pages: 37-

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Abstract

The disposal of potentially toxic element PTEloaded sludge that is produced during industrial or commercial wastewater treatments evoke concerns because of the probability of hazardous environmental consequences In the current work we proposed a chelantassisted decontamination technique of the laboratoryproduced PTEloaded As Cd Pb polymericFecoated sludge and subsequent recovery of the chelants and PTEs The chelant options include both biodegradable EDDS GLDA and HIDS and nonbiodegradable EDTA alternatives The washing performance was compared and discussed in terms of the solution pH and relative stabilities of the complexes of PTEs and chelants in solution The changes in solution pH or chelants have no significant effect on the chelantinduced removal efficiency of Cd and the same result was observed for Pb at extreme and moderate acidic pH The Asextraction rate is also improved with chelant in the solution despite a limited interaction between the chelant and the arsenic species in the solution The columnpacked solidphase extraction SPE system which was equipped with macrocycle chelating resin or ionexchange resin was used to explore the corresponding separation performance of the PTEs and chelant The macrocycleequipped SPE system shows better selectivity than other SPEs in terms of extraction and recovery performance of the PTEs regardless of the chelants Some unique points of the proposed process are minimum environmental burden due to the use of biodegradable materials in the washing solution and cost minimization by recycling the ingredientsThe study was partially supported by the GrantsinAid for Scientific Research 24310056 from the Japan Society for the Promotion of Science One of the authors Ismail M M Rahman acknowledges the financial grant from the Public Foundation of Chubu Science and Technology Center Japan to support his research at Kanazawa University Japan The authors also acknowledge the kind support from Dr Md Alamgir Department of Soil Science University of Chittagong Chittagong 4331 Bangladesh for the statistical analysis of the data

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