Project Description

 

Client: Arcadis / City of Houston

Location: West District and Upper Brays  Houston, TX

The project included preliminary design, detailed design, and construction administration services for the rehabilitation of the head works odor control system, installation of a bypass pumping access shaft upstream of the influent lift station, and replacement of the guide cable system in the lower chamber of the influent lift station at the 18.0 MGD Upper Brays WWTP and addition of a bar screening facility and headworks odor control system at the 26.4 MGD West District WWTP. KIT designed the site and yard piping components.

The objective of the Upper Brays WWTP odor control system component was to identify deficiencies and initiate measures needed to return the operation of the Upper Brays WWTP headworks odor control system to its original condition. The evaluation of the odor control system included a conditional review of the existing facilities and biofilter media options. Organic and engineered replacement media options were evaluated.

The objective of the bypass pump access shaft component was to determine the design criteria and provide recommendations for a new access shaft on the existing influent line located upstream of the lower chamber of the influent lift station that allowed the City of Houston to bypass the lower chamber with temporary pumps. Multiple construction and flow isolation methods were evaluated to determine a cost effective solution for the constructing the bypass pump access shaft over the existing 108-inch diameter sanitary sewer that is 65 feet below grade.

The objective of the guide system component was to identify deficiencies in the existing cable guide systems for the submersible pumps in the lower chamber of the Upper Brays WWTP influent lift station and recommend corrective actions. The evaluation of the existing guide system determined the need for the rehabilitation of the existing guide system. The options considered included replacing the guide cable system with a manufacturer supplied guide cable system and retrofitting the pumps with a guide rail system.

The preliminary treatment screening facility for the West District WWTP included the addition of a bar screen facility that removed solids and debris from the wastewater influent to protect downstream operations and equipment from damage. The bar screen facility included mechanical bar screens, manual bypass bar screen, screenings conveyance, screenings washing and compacting, screenings storage, odor control system, and provisions for future grit removal. The confined site required the bar screen facility be constructed within an existing aeration basin.

3 Key Factors/Benefits to Client:

  • Headworks
  • Odor Control
  • Influent Lift Station