Category: Uncategorized

Metropolitan St. Louis Sewer District

As part of the efforts by the MSD Pump Station division to move towards predictive maintenance strategies at critical facility locations, EDCS designed a communications backbone system for MSD’s master lift pump stations. The primary goal of this project was to design a communication backbone at four master lift pump stations to connect the data collected at the pump stations to the GE iFIX historian at Lemay Pump Station No. 1 as well as provide short-term data logging capability at each station. In addition, this project addressed expansion of the communications backbone and how a similar installation may be repeated for other pump stations in the future.  

After considering several technologies, the focus for communication transmission on this project was chosen to be distributed cellular communications. The cellular communication hardware was selected to connect with the existing SCADA hardware at each lift pump station. EDCS performed site visits, coordinated with pump station staff and cell service providers, produced a preliminary design report, calculated cost estimates, and created construction drawings and specifications.

Metropolitan St. Louis Sewer District

Project to rehabilitate the Vance Road Pump Station (built in 1986).  Goal is to provide a structure that meets current codes including building, safety, fire, floodplain, etc., and has a useful remaining service life of at least 30 years.  The station was in good condition, except for flooding issues during rain events, due to influent sewer capacity being 2 or 3 times the pumping capacity.  Flooding has led to corrosion issues and deterioration of the lower portions of the structure. Building entrances and interior electrical and control gear are not above the revised 100 year and 500 year flood water elevations, and are subject to flooding.  The station did not meet current codes, so modifications were required to bring the station into compliance.  Specific engineering services during construction include: shop drawing and submittal reviews (including O&M manuals), perform site visits and respond to questions received from District or Construction Manager regarding project design and provide details for any changes, provide start up assistance, provide as-built drawings, attend progress meetings (including pre-construction meeting).

Metropolitan St. Louis Sewer District

Project to design the process improvements to increase the secondary treatment capacity from 167MGD to 210MGD in order to meet new consent decree requirements. EDCS was responsible for providing electrical and controls design for this project. Site surveys were conducted of existing equipment for modification and reuse, as well as relocation due to building locations. After the study and report phase, it was apparent that the amount of screenings in the plant was impacting the secondary treatment; therefore, new screenings buildings were installed at the Wet Weather Screening Building and the Headworks Screening Building. The two screenings buildings are located in different areas of the plant and required new power feeds from the existing plant power distribution, provisions for generator connections, and electrical equipment rated for the Class I Division 2 area classifications. A new odor control system and HVAC system to reduce area classifications and new bar screen climber control panels and washer compactor control panels were required at each facility. The new facilities also have new PLC control panels which are networked together and integrated into the existing plant Invensys system. Other areas of work were instrumentation improvements for the replacement of magnetic flow meters at the aeration basins and secondary clarifiers. New suspended solids meters were installed to improve solids balancing through the system. These meters are connected into the plant SCADA system using wireless I/O.

Illinois American Water Company (American Water Works Service Company, Inc.)

Project to attain the necessary disinfection credits to achieve Bin 2 compliance.  All work designed for plant flow of 55MGD, with provisions for expansion to 75MGD (future connections provided to facilitate installation of new basins and filters to be constructed in future phases). Transfer Pump Station and Wetwell portion of project includes a below grade transfer wetwell (300,000 – 500,000 gallons) with two compartments to allow for isolation with intermediate baffle walls, allowing for gravity flow from existing filters and Aldrich units; four vertical turbine transfer pumps (55MGD) two pumps equipped with VFDs; four 24” UV reactors; traveling bridge crane; single-story building to house pumps, UV and electrical room.  Clearwell portion of project includes two 5MG storage tanks designed to operate in parallel or in series and in isolation of one tank from service.  High Service Pump Station portion of project includes design of an at-grade high service pump station consisting of four horizontal split-case high service pumps and two backwash supply pumps. Two high service pumps on VFDs at 4,160V, one additional pump on diesel power, traveling bridge crane, single story building to house pumps and electrical room.

Metropolitan St. Louis Sewer District

The Metropolitan St. Louis Sewer District has operated multiple hearth incinerators at both its Bissell Point and Lemay treatment facilities for nearly 60 years. Although these facilities have served the region well and they continue to meet or exceed all air quality standards, their age and the development of newer, cleaner technology makes replacing them a priority.

This project is to replace the existing 1960s-era incinerators with advanced incineration units for the Bissell Point Wastewater Treatment facility with a total treatment capacity of 240 dry tons of solid waste per day. The Lemay Wastewater Treatment facility will have three new units with a total treatment capacity of 160 dry tons of solid waste per day. This will be the largest capital improvement projects in MSD history. 

EDCS provided the electrical portions of the Preselection Evaluation, Pre-Design Report, and the Conceptual Design. Initial work included: the development of one-line electrical power distribution schematics for the Bissell Point and Lemay WWTFs for supply of power to new FBI facilities, including dewatering, and review of existing electrical power distribution for Bissell Point and Lemay WWTFs.  Major equipment electrical loads for new FBI facilities were provided.  EDCS also developed electrical specifications for the preselection package including Common Motor Requirements for Process Equipment.  Electrical specification work for the System Supplier RFP included electrical components on skid mounted equipment (blowers, venturi pumps, GAC preheater skid, chemical feed skid, etc.) and other items necessary for coordination with the design-build contractor. 

Conceptual Design work included the development of one-line electrical power distribution schematics for the Bissell Point and Lemay WWTFs for supply of power to all new facilities/equipment, including raw sludge pumping, sludge dewatering and sludge cake conveyance equipment, incinerator ash handling systems, sludge cake trucking receiving stations, sludge cake truck loading stations, odor control, general building HVAC systems and lighting, and other miscellaneous power needs associated with the new facilities.  Electrical design criteria guidelines were developed for the design-build RFP conceptual documents including major electrical gear such as motor control centers, switchgear, transformers, and adjustable frequency drives.