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©2011 Lockwood,
Andrews & Newnam, Inc.
City of Rosenberg Wastewater Treatment Plant #2 Expansion
Rosenberg, Texas
Description:
The City of Rosenberg selected LAN to provide professional engineering services related to the expansion and improvement of its existing 3.0-million-gallons-per-day (mgd) wastewater treatment plant (WWTP) No. 2, in an effort to support the rapid growth anticipated to occur within the City and its Extraterritorial Jurisdiction (ETJ) in the upcoming years. Available regional water supply planning studies predict a 38 percent increase in the county's population by 2010, an additional 29 percent by 2020, and a further 27 percent by 2030. The proposed expansion will increase the plant's current average daily flow (Qadf) capacity from 3.0-mgd to 4.5-mgd, and its 2-hour peak flow (Qpk) rate from 9.0-mgd to 18.0-mgd.
LAN first considered the history of the plant, including its original design concept, mode of system operation, and the modifications implemented over the life of the facility. This research was particularly critical because original structures, built in 1972, are still in service. In expansion design, it is essential to know how these facilities have been modified to determine how they will respond to new processes and equipment operation.
The final design plan for the facility includes the expansion and/or improvement of the existing on-site lift station, aeration basin and blowers, clarifier splitter box, clarifier piping, scum pump station, and aerobic digester and blowers, as well as the construction of a new headworks structure, aeration splitter box, second aeration basin, third clarifier, Return Activated Sludge (RAS)/Waste Activated Sludge (WAS) pump station, Ultraviolet Light (UV) disinfection structure/system, Non-Potable Water (NPW) system, rotary drum thickener, and second aerobic digester basin.
Key considerations in the design development included:
• Minimizing capital costs with the use of existing facilities
• Implementing elements like Dissolved Oxygen control, new aeration basin and digester aeration system and blowers, sludge pre-thickening, and automated control systems to increase operational efficiency and improve performance
• Maintaining continuous plant operation during construction with proper sequencing
• Implementing elements to increase safety of operations staff and local community, including the construction of a new headworks structure to eliminate confined space entry concerns associated with the existing below grade structure, the provision of a back-up generator to ensure continual operation in the event of a power outage, and the replacement of the existing gas chlorination system with an Ultraviolet Light (UV) disinfection system
• Eliminating use of potable water for equipment wash down/plant operations with a NPW system, allow for acquisition of water re-use credits, and contribute to environmental friendliness of facility
LAN was also responsible for submitting the Texas Pollutant Discharge Elimination System (TPDES) major permit amendment application to the Texas Commission on Environmental Quality (TCEQ), and for the associated TCEQ compliance coordination required throughout the duration of the project.
In addition, LAN was tasked with providing on-site construction inspection services for the extent of the 20 month construction period. Construction of the approximately $10.5 million project is expected to be completed by the end of 2008.
Awards:
Testimonials:
City of Rosenberg Wastewater Treatment Plant #2 Expansion
Rosenberg, Texas
Description:
The City of Rosenberg selected LAN to provide professional engineering services related to the expansion and improvement of its existing 3.0-million-gallons-per-day (mgd) wastewater treatment plant (WWTP) No. 2, in an effort to support the rapid growth anticipated to occur within the City and its Extraterritorial Jurisdiction (ETJ) in the upcoming years. Available regional water supply planning studies predict a 38 percent increase in the county's population by 2010, an additional 29 percent by 2020, and a further 27 percent by 2030. The proposed expansion will increase the plant's current average daily flow (Qadf) capacity from 3.0-mgd to 4.5-mgd, and its 2-hour peak flow (Qpk) rate from 9.0-mgd to 18.0-mgd.
LAN first considered the history of the plant, including its original design concept, mode of system operation, and the modifications implemented over the life of the facility. This research was particularly critical because original structures, built in 1972, are still in service. In expansion design, it is essential to know how these facilities have been modified to determine how they will respond to new processes and equipment operation.
The final design plan for the facility includes the expansion and/or improvement of the existing on-site lift station, aeration basin and blowers, clarifier splitter box, clarifier piping, scum pump station, and aerobic digester and blowers, as well as the construction of a new headworks structure, aeration splitter box, second aeration basin, third clarifier, Return Activated Sludge (RAS)/Waste Activated Sludge (WAS) pump station, Ultraviolet Light (UV) disinfection structure/system, Non-Potable Water (NPW) system, rotary drum thickener, and second aerobic digester basin.
Key considerations in the design development included:
• Minimizing capital costs with the use of existing facilities
• Implementing elements like Dissolved Oxygen control, new aeration basin and digester aeration system and blowers, sludge pre-thickening, and automated control systems to increase operational efficiency and improve performance
• Maintaining continuous plant operation during construction with proper sequencing
• Implementing elements to increase safety of operations staff and local community, including the construction of a new headworks structure to eliminate confined space entry concerns associated with the existing below grade structure, the provision of a back-up generator to ensure continual operation in the event of a power outage, and the replacement of the existing gas chlorination system with an Ultraviolet Light (UV) disinfection system
• Eliminating use of potable water for equipment wash down/plant operations with a NPW system, allow for acquisition of water re-use credits, and contribute to environmental friendliness of facility
LAN was also responsible for submitting the Texas Pollutant Discharge Elimination System (TPDES) major permit amendment application to the Texas Commission on Environmental Quality (TCEQ), and for the associated TCEQ compliance coordination required throughout the duration of the project.
In addition, LAN was tasked with providing on-site construction inspection services for the extent of the 20 month construction period. Construction of the approximately $10.5 million project is expected to be completed by the end of 2008.
Awards:
Testimonials:
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