An Integrated Approach To In-situ Remediation
Of A Former Paint Manufacturing Facility
Author(s)
F. C. Ballesteros, L. F. DeSales & G. D. Pamintuan
Abstract
In the Philippines, there are neither regulations nor standards governing the
remediation of contaminated sites. Using the United States Environmental
Protection Agency (USEPA) Environmental Site Assessment (ESA) Procedure,
ESA Phases 1 and 2 were conducted on a contaminated facility suspected of
VOCs and TPH. Initial testing using auger drilling up to two (2) meters depth
showed at least five (5) impacted areas. The 2.4-hectare property was then
subjected to a 5m x 5m drilling grid in the 5 areas and test pitting. The following
were found to have contributed to the contamination in the area: an underground
storage tank which contained, among other compounds, acetone and esters; a
drainage system emptying into a series of settling ponds; and another drainage
system which was older but apparently was not part of the plant facility. Most of
the subsurface contamination was in the clay layers which were of two kinds: a
lighter brown type which was deposited from the nearby mountains, and a dark,
organic matter-bearing clay, which has been deposited by an ancient river in the
area. Contamination in the clays took the form of a plume which spread out from
the storage tank and leakage of TPH from the drainage systems overprinted the
plume. A layer of coarser sediments (sand- up to gravel-sized) at depths of
4 meters or more marked the deepest parts of the pit; behaviour of contaminant
movement was not easy to follow in this stratum due to the high
porosity/permeability. Tests included visual, olfactory, pH, PID and laboratory
tests for VOCs and TPH; a correlation between the last two tests was done to
lower cost of laboratory testing; water produced during the excavation was
chemically treated using FeCl3 before discharging to a nearby creek.
Bioremediation using white rot fungus, Phanerochaete chyrsosporium, was done
Keywords
composting, bioremediation, SVOC, developing country
Related Book
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