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Water and Wastewater Plant Directory
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Halifax, Nova Scotia, Canada
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HRM Leachate Treatment Facility
Halifax Regional Municipality
P.O. Box 1749
Halifax, Nova Scotia, B3J 3A5
Canada
Contact Information:
Contact: R. Reid
Email:
reidr@region.halifax.ns.ca
Telephone: 902-490-4000
Fax:
Plant Operation: Municipal
Processing: Wastewater
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Web site:
http://www.region.halifax.ns.ca/Works/wwt/leachate.html
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Plant/Process Description:
The upgraded Leachate Treatment Facility, located
at the Highway 101 Landfill Site was completed in
1988 at a cost of 4.2 million dollars.
Leachate is collected via a series of pipes
placed at the bottom of a landfill site. Daily
leachate flows average 35,000 gallons per day
with strengths approaching 30,000 mg/L COD and
25,000 mg/L BOD.
Raw leachate from the collection system enters
the pumping station wet well and is then pumped
to the equalization tank.
Leachate from the equalization tank enters the
pretreatment section where it is mixed with 50%
sodium hydroxide solution which raises the pH to
9.5. The purpose of this process is to allow
heavy metals to precipitate and to reduce
dissolved solids. Settled heavy metals are
removed automatically and sent to a gravity
thickener. Flow from the pretreatment section
enters the reactor feed wet well and is pH
adjusted with hydrochloric acid before being
transferred to the anaerobic reactor
system.
The high rate anaerobic upflow reactors remove an
average of 60-70 percent of the COD and BOD
before sending the waste stream to the next stage
of treatment. Each reactor employs both suspended
growth and fixed film biological processes to
accomplish this task. Methane produced in the
reactors is used to fuel a 1,000,000 BTU boiler
which in turn heats the reactors and the main
treatment building.
Effluent from the reactors flows in series
through two aerated lagoons which have a total
volume of 17,000 cubic meters. Oxygen is supplied
to the lagoons by means of three 2400 scfm
centrifugal blowers. Lagoon 2 incorporates an
integral clarifier which allows beneficial
biosolids to settle. These settled solids
(activated sludge) can be recirculated back to
the head of the lagoon system to provide an
increase of microorganisms for further
degradation of organics.
Lagoon effluent flows in series through four
sedimentation ponds. The purpose of these ponds
is to provide sufficient residence time for
solids to settle out of the waste stream.
Flow from the sedimentation ponds enters the
engineered wetlands. This is a free-water surface
type of wetlands system, which utilizes
indigenous vegetation to remove any remaining
COD, carbonaceous BOD and to provide
nitrification/denitrification of the waste
stream. Plants absorb nutrients and oxygen within
the water by means of natural biological
processes. The wetlands system is comprised of
two sections, the head pond and the marsh meadow.
These two sections have a total area of 5.5
hectares and are equipped with adjustable outfall
gates for seasonal process optimization. The
wetlands system is the first in North America to
be used for leachate treatment.
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Owner:
Halifax Regional Municipality
Web site:
http://www.region.halifax.ns.ca/
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Operating Company:
Halifax Regional Municipality
Web site:
http://www.region.halifax.ns.ca/
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Directions:
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Disclaimer:
Water and Wastewater.com provides the information on
this page for reference purposes only. We do not certify
the accuracy of the information provided by third-party
individuals for this listing.
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