Adsorbable organic halides (AOX), AOX formation potential, and PCDDs/DFs in landfill leachate and their removal in water treatment processes |
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Authors: | Yukio Noma Sayuri Yamane Akiko Kida |
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Institution: | (1) National Institute for Environmental Studies, Research Center for Material Cycles and Waste Management, 16-2 Onogawa, Tsukuba, Ibaraki, 305-0053, Japan Tel. +81-298-50-2846; Fax +81-298-50-2808 e-mail: noma.yukio@nies.go.jp, JP;(2) Hiroshima Prefectural Research Center for Health and Environment, Hiroshima, Japan, JP |
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Abstract: | Adsorbable organic halides (AOX) and AOX formation potential (AOXFP) were investigated in 46 landfill lea-chates as potentially
toxic parameters. AOX in landfill leachate was within the range <10–2200 μg Cl/l, and AOXFP was within 51–15 000 μg Cl/l.
AOX and AOXFP correlated with chemical oxygen demand (COD). AOX discharge from closed landfills was generally lower than that
from operating landfills. The molar ratio of AOXFP/total organic carbon (TOC) suggested that organic compounds in a leachate
have a double bond every 15–190 carbons under the supposition that one chlorine would add to one double bond. The five landfills
discharging high-level AOXFP (>4000 μg Cl/l) were all landfills where sludge had been dumped. The removal efficiencies of
three parameters through leachate treatment processes were as follows: polychlorinated dibenzo-dioxins/dibenzo-furans (PCDDs/DFs)
> TOC > AOX. PCDDs/DFs were substantially removed at p.p.t. levels, while AOX was hardly removed at relatively low levels.
Received: February 14, 2000 / Accepted: January 9, 2001 |
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Keywords: | Adsorbable organic halides (AOX) AOX formation potential (AOXFP) Leachate Chlorination PCDDs/DFs |
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