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Leaching Characteristics of Acid Tars
The following data is based on acid tar samples from a lagoon
containing tar from oil rerefining. It should be taken as indicative
of the type of leaching behaviour that acid tars may display,
but not necessarily be applicable to all acid tars.
- Batch Leaching Test (Solid to Liquid Ratio 1:10)
While outwardly seeming stable, all weathered forms
of acid tar were capable of leaching reduced, though still
significant quantities of acid, sulfate and TOC.
- Cascade Leaching Test
Cascade tests on all tar types up to a cumulative
solid liquid ratio of 1:60 indicated continued production
of significant quantities of TOC, while levels of leached
sulfate stabilized at this point.
- Flowcell Leaching Test
A set of flow cell tests were designed and carried out to
simulate leaching of acid tars over a constrained interface
with a saturated model coarse grained soil. The results demonstrated
that the leaching rate of acid tar in the flow cell was significantly
lower than in the batch and cascade test but occurs over a
longer term than an equivalent cascade test. The tests also
demonstrated that acid tars in contact with a saturated coarse
grained soil can migrate in bulk in a heterogeneous pattern
temporally and spatially, thus significantly increasing the
leaching interface area.
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All information herein is provided in good
faith. It is not intended to be, and should not be relied on
as, a substitute for professional advice. See disclaimer.
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