Eastside WWTP Phosphorus Removal Project

Firm: Donohue & Associates, Inc.

Other Consultants:

Owner: City of Joliet

Description: Donohue served as the Prime Engineering Consultant Original or Innovative Application of New or Existing Techniques Variation of the A/O process - Design included customized application of computerized process simulation to achieve biological phosphorus removal without adding volume to the existing aeration tanks Effluent nutrient trading – This project allows the Eastside WWTP to remove additional phosphorus biologically to reduce the chemical treatment required at Westside WWTP (Trading previously approved with NPDES permit for Westside WWTP) 2. Future Value to the Engineering Profession and Public Perception Administration and Training building – The new Administration building and naturally landscaped buffer zone improve the aesthetic appearance of the facility to adjacent residential neighborhoods; Training facility will be used by multiple City Departments and 3rd party organizations for work training and professional organization education Native plants – This project continued and expanded the City’s use of native plants and green BMPs to reduce maintenance costs and improve the natural environment 3. Social, Economic and Sustainable Design Considerations Improved Digester Performance – By increasing pre-digested sludge solids content, the digesters have increased capacity and improved volatile solids production Reduced Biosolids Volumes – Improving digester performance and providing ability to thicken digested biosolids, the biosolids volume is reduced, this reducing contract land application/disposal costs Improved Nutrient Recovery – Implementation of biological phosphorus removal processes increases the concentration of bio-available phosphorus in the resultant biosolids, increasing is value in resource recovery Native plant landscaping/Stormwater BMPs – Integration of native landscaping and stormwater BMPs (vegetative detention area, rain garden, and improved infiltration areas), reduces stormwater runoff, improves runoff water quality and reduces use of herbicides and fertilizers needed to maintain non-native landscapes. Odor Control – The new thickening building improvements included odor control equipment to reduce the facilities impact on the community 4. Complexity Operating facility – The Eastside WWTP is an operating treatment facility with effluent requirements in force throughout construction. Design and construction activities were planned to account for partial and temporary shutdowns while maintaining the required effluent quality. 5. Exceeding Client/Owner Needs Operational Flexibility – The project design provided improved operational flexibility with phosphorus removal backup capability, multiple pre- and post-digestion thickening options, and a mobile dewatering centrifuge in case of weather related land application limitations. Improved Community Relationship – Multiple aspects of the project improved the “face” of the facility, including a larger natural landscaping buffer area, an improved entrance and facility fence, a modern Administration facility, and added odor control equipment. Improved Working Conditions – Addition of the Administration Building greatly improved working conditions for City staff, including providing a modern breakroom and lunch room, a larger process control room with sufficient space for document storage, and a women’s locker room. Improved Laboratory Safety – The project improved laboratory safety by providing improved counter space and dedicated work stations for various analysis and testing activities, significantly improved ventilation, dedicated office space for technicians and supervisors, and replacing antiquated facilities within the laboratory.

City of Joliet