HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Avnimelech, Y. Articles by Raveh, A. Search for Related Content PubMed Articles by Avnimelech, Y. Articles by Raveh, A. Agricola Articles by Avnimelech, Y. Articles by Raveh, A.

Decomposition of Chelates Leached from Waste Disposal Sites¹

ABSTRACT

Heavy metals chelated by organic ligands and sites may endanger adjacent water bodies. Potential chelation capacity of solutions was determined through the effect of the chelating agents on the solubility of CaCO₃. The method is simple and yields consistent results.

Leachates from sanitary landfill models were incubated aerobically and anaerobically with clay loam, calcareous clay loam, and CaCO₃ for periods of up to 120 days. No significant adsorption of the chelates was detected. Decomposition of chelates in the anaerobic systems was very slow and insignificant. Decomposition in aerobic systems was relatively fast, leading to a residual chelation capacity of only 0.1–1% of the initial value after a 74-day incubation. It is essential, accordingly, to avoid direct drainage of anaerobic leachates from a waste disposal site into a water body.

Key Words: heavy metals • chelating agents • landfill • sludge • water pollution • water quality

¹ Contribution of Dep. of Agricultural Engineering, Technion, Israel Inst. of Technology, Haifa, Israel. The work was supported through a grant from Israel Water Commission.

² Associate professor and research engineer, respectively, Technion. The senior author is presently on leave at the USDA-SEA, Southern Plains Watershed and Water Quality Lab., P.O. Box 1430, Durant, OK 74701.

Received for publication May 5, 1981.