 |
|
Water and Wastewater Plant Directory
L
|
|
|
|
Halifax, Nova Scotia, Canada
|
|
Lakeside/Timberlea WPCP
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
|
|
|
Web site:
http://www.region.halifax.ns.ca/Works/wwt/lakeside.html
|
Plant/Process Description:
Serves: Beechville-Lakeside-Timberlea
Constructed: 1984
Engineering firm: CBCL
Process: Enhanced secondary
Receiving water: Nine Mile River
Present capacity: 1.5 million gallons/day
Ultimate expanded capacity: 3.0 million
gallons/day
This facility was the first large scale rotating
biological contactor (RBC) process constructed in
Nova Scotia. Due to the sensitivity of the Nine
Mile River ecosystem, a high quality effluent
with phosphorous removal and nitrification
(summer) was required in order to conform with
Federal and Provincial regulatory approval
guidelines. The Lakeside/Timberlea facility
routinely produces an effluent quality of less
than 10 mg/L BOD, 10 mg/L suspended solids, 1.5
mg/L P, 3.0 mg/L ammonia.
Process:
Preliminary treatment consists of automatic bar
screening and inorganic solids removal by means
of an aerated grit chamber which also serves to
oxygenate the raw influent wastewater.
Primary clarifiers retain the wastewater flow for
a period of 3-4 hours in order to allow heavier
organic solids to settle by gravity. Scraper
mechanisms remove surface floatables and grease
which are transferred along with settled sludges,
to the anaerobic digester operation.
Primary effluent is directed to (2) trains of (4)
RBC units in parallel. These contactors have a
rotating ‘shaft' surrounded by plastic disks
call ‘media' to which a biological growth
attaches. The total media surface area is
1,000,000 sq.ft. As the RBC rotates in the
wastewater, the fixed bacteria metabolize (feed
upon) carbonaceous organic compounds which are
converted to new bacterial growth, carbon dioxide
and water. Nitrification, or the conversion of
ammonia to nitrates, is performed by nitrifying
bacteria which are established on the fourth
stage RBC shafts.
Secondary clarifiers collect spent RBC biomass
and any remaining suspended solids. Alum is added
at this stage in order to precipitate soluble
phosphorus. Settled solids are pumped to the
anaerobic digester.
Disinfection: Chlorine is added to the secondary
effluent prior to entering the chlorine contact
tanks. Sufficient detention time (1 hour) allows
the destruction of any remaining pathogenic
bacteria.
Post aeration tanks: Diffused air is applied in
order to oxygenate the final effluent to a level
of at least 5 mg/L dissolved oxygen.
Biosolids (sludge) treatment and stabilization is
performed by the anaerobic digestion process
producing methane gas as a by-product. At
present, methane provides 40% of boiler
requirements for the facility buildings and
digester heating.
|
Owner:
Halifax Regional Municipality
Web site:
http://www.region.halifax.ns.ca/
|
Operating Company:
Halifax Regional Municipality
Web site:
http://www.region.halifax.ns.ca/
|
Directions:
|
|
|
|
|
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
