PROJECT EXPERIENCE
CLIENT OR OWNER NAME – ARIAL NARROW SIZE 9
METROPOLITAN ST. LOUIS SEWER DISTRICT
Coldwater Creek Treatment Plant Improvement
The Metropolitan St. Louis Sewer District hired Black &
Veatch to renovate and upgrade its Coldwater Creek
Wastewater Treatment Plant. Originally constructed in the
late 1960’s, the plant has undergone a complete renovation of
its primary treatment facilities along with upgrades to other
processes within the plant. With the completion of the
improvements, the existing 40 mgd plant is able to pump and
screen 219 mgd of raw water influent, treat 135 mgd through
primary treatment, and 55 mgd through secondary treatment.
A new trunk sewer needed to eliminate overflows in the
collection system enters the plant at a lower elevation than the
Coldwater Creek
previous
influent
sewer.
This
new trunk sewer required the design and construction of a
Wastewater Treatment
Plant
new raw wastewater pumping station. The pump station contains 2 – 27 MGD and 3 –
Project Elements
55 MGD influent pumps. New primary clarifiers and grit removal facilities were also
Capacity
constructed. The anaerobic digesters, which produced methane gas used to operate
Automated Plant
Extensive Use of Technology aeration blower motors, were taken out of service. Therefore, new electric motor driven
Suburban Service Area
blowers were installed. A new sludge thickener and sludge pumps were also installed. A
new maintenance building was designed and constructed. A new final clarifier was
Key Team Members
Jim Touslee, Project
constructed. The District also automated the plant to allow it to be operated unattended
Manager
during off shifts through the use of remote monitoring technology to detect potential
Alan Christanell, Project
problems and provide selected control functions.
Engineer
Howard Analla, Operations
Specialist
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Prior to recommending the construction of these new facilities, Black & Veatch
conducted a detailed evaluation of the existing plant’s treatment process. This evaluation
Services
included a facilities review along with an analysis of the plant operating data. The
WWTP Evaluation
WWTP Expansion Design analysis included collecting and evaluating plant data from the previous three years. The
secondary treatment process was evaluated using Black & Veatch’s activated sludge
Period of Services
03/2000 to 11/2005
model on the aeration basins and final clarifiers. A hydraulic capacity analysis of the
Cost
plant was also performed to determine if piping modifications would be required
Engineering Fee $4,031,000
between the new primary treatment facilities and existing secondary facilities.
Construction $57,900,000
New treatment regulations will soon require MSD to provide disinfection at the
Client Reference
Mr. Jonathon Sprague
Coldwater Wastewater Treatment Plant, which currently has no operable facilities for
Director of Operations
disinfection. Black & Veatch’s evaluation included reviews of the following methods of
Metropolitan St. Louis Sewer
disinfection: on-site generation of sodium hypochlorite, liquid sodium hypochlorite, and
District
2350 Market St.
ultraviolet disinfection. Several other disinfection methods were eliminated at the initial
St. Louis, MO 63103
stage in the evaluation. Black & Veatch developed conceptual implementation plans and
preliminarily identified the facilities required to implement the various disinfection
alternatives at the treatment plant. Ultimately, the method of disinfection used at the
Coldwater WWTP will be influenced by current regulations. Black & Veatch is
BLACK & VEATCH
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PROJECT EXPERIENCE
CLIENT OR OWNER NAME – ARIAL NARROW SIZE 9
currently working with the district to analyze the effluent wastewater stream to
determine regulatory implications of each disinfection method. Once the method of
disinfection is selected, the district will have to have it implemented by April 2011.
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