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Large-scale Use of Phoslock(R) for a Canadian Municipality and Stormwater Management Purpose

November 12, 2012

BRAMPTON, ON, Nov. 12, 2012 /CNW/ – For over a decade, the effectiveness
of a niche / proprietary water quality treatment product called Phoslock(R) at precipitating and entrapping phosphorus has been proven on the world
stage and through many research and field studies for drinking water
reservoirs and freshwater lakes. Since 2008, pilot-scaled projects have
been completed in Ontario (and evaluated by an independent agency) to
demonstrate the effectiveness of Phoslock(R) to resolve excessive
phosphorus issues and Blue-Green algae problems for stormwater
management ponds, reservoirs, lakes and agricultural drain systems. The
application protocols were approved by the Federal Government and
Province of Ontario. Last week, and after harvesting excessive
vegetation from a large stormwater management facility, the first major
application of Phoslock(R) was completed for a Canadian municipality.
From a maintenance perspective, the use of Phoslock(R) for the Loafer’s
Lake facility (within the City of Brampton) was determined to be more
cost-effective than other available water treatment technologies or a
sediment removal approach.

Phoslock(R) is manufactured by combining lanthanum with bentonite. The
lanthanum forms a permanent electrostatic bond with the bentonite and
does not leach from the bentonite. The resulting product binds strongly
with phosphate forming a particulate material which will sink to a
lake, pond or watercourse bed. It is insensitive to the range of
redox, temperature and pH conditions naturally found in lakes and
therefore provides for a permanent removal of phosphate. Once on the
bed, unsatisfied lanthanum bonds continue to bind phosphate, either
released from the sediment below or from the water column above.

Applications of Phoslock(R) to lakes and reservoirs have been shown to
reduce concentrations of phosphate in the water column to very low
levels, concentrations low enough to substantially limit Blue Green
algal growth. The product is most effective if applied in the late
fall, ensuring that in-lake or reservoir phosphate concentrations from
the next growing season are sufficiently low to limit Blue Green algal
growth. Phoslock(R) is not a herbicide. The key mode of operation of
Phoslock(R) is to rapidly remove almost all phosphate from the water
column and through this reduction, influence the primary producers
(algae) by limiting their growth. In any lake or reservoir where there
are external sources of phosphorus (e.g. from a river system or where
sediment re-suspension occurs), phosphorus will be measurable in the
water column. However, phosphate will continue to be bound up by the
Phoslock(R), as long as unsaturated lanthanum remains. Finally, so long
as significant external nutrient sources to a water body continue, the
period of time over which Phoslock(R) is effective will be reduced.
Applications may then be needed for other years.

GREENLAND((R) )is a Canadian-based engineering and technology enterprise that works in
the environmental, water resources and land development engineering
sectors and specifically projects with an integrated watershed
management and infrastructure planning/design; information technology
development; and, public private partnership focus.

SOURCE Greenland Group of Companies


Source: PR Newswire