Trotter and Associates, Inc. recently completed a Wastewater Treatment Plant Consolidation Study for the Village of Addison. As a result of the study, the Village elected to fully consolidate their facilities in lieu of doing a partial consolidation or rehabilitating and upgrading their existing treatment facilities. For constructability and financing advantages, the consolidation was separated into three phases. The Trotter team has begun developing the improvements for the first phase, which includes upgrading and expanding the North Wastewater Treatment Plant. Upon completing all three phases, this facility will process all wastewater flows from within the Village. Phase one includes construction of a 44,500 square foot Garage/Laboratory/Operations Building, Screening Building, Advanced Treatment Building (low-P treatment basins, tertiary filters, and UV disinfection), and excess flow clarifiers. In addition to these new structures, the following existing processes will be improved: upgrades to the grit removal system, rehabilitation of the primary and final clarifiers, rehabilitation and expansion of the aerobic digestion process and digester gas storage, and expansion of the biological process, which includes conversion from a two-stage extended aeration process to a single-stage A2O process. Construction is planned to begin in 2026 and continue into 2030.

Previously, Trotter and Associates completed a Wastewater Facility Master Plan for the Village of Roselle’s Joseph L Devlin Wastewater Treatment Facility. The plan identified four essential projects: Plant Expansion and Phosphate Removal, Grit Removal Rehabilitation, Secondary Clarifier Replacement, and UV Disinfection Conversion. Each project identified above is interrelated and will allow the facility to meet new regulations, support Village growth, and upgrade aging infrastructure. To provide the village with the best financial and operational benefit, these projects were combined into one WWTF Plant Expansion and Nutrient Removal Upgrades project. With preliminary engineering complete, the Trotter team is working on the final design documents for the project. This phase is expected to be wrapped up in the first quarter of 2026, with bidding and construction to follow. 

Trotter and Associates assisted the Village of Glendale Heights in implementing the phosphorus removal upgrades at their wastewater treatment facility. The existing biological process utilized single stage nitrification which took place within the four aeration basins. As part of the project these basins have been converted to an A2O process. Baffle walls were installed to create separate anaerobic, anoxic, and aerobic zones. Additionally, submersible mixers were installed and an internal recycle pump conveys nitrified MLSS to the anoxic zone for denitrification. Chemical polishing facilities were constructed to allow dosing of alum upstream of the secondary clarifiers or prior to solids dewatering. The improvements were completed in October 2024, and TAI is now assisting the Village with process monitoring and optimization.

The second phase of improvements to Batavia’s Wastewater Treatment Facility was broken into two sub-phases: Phase 2A Rehabilitation and Phase 2B Expansion. IHC began construction for Phase 2A on September 18 th , 2023, and will continue through 2026. This project includes intensive offsite utility replacement and realignment, bike path realignment, demolition of several large structures within the Facility, replacement of the excess flow facilities, construction of new Headworks including screening, grit removal, and odor control, construction of a new primary clarifier diversion structure, four 68’-diameter primary clarifiers, and a Primary Clarifier Control Building, construction of three new duplex raw sewage pump stations, rehabilitation of the three final clarifiers, construction of a new UV disinfection building, and replacement of the WAS thickening systems.

Trotter and Associates was retained by the Village of Glendale Heights for engineering led design-build services for their Mill Pond Lift Station. Work included the replacement of the station’s pumping and electrical systems and the rehabilitation of the existing wet well. With the project directly adjacent to Klein Creek, the team had to complete extensive permitting and monitoring of construction activities to ensure the watershed wasn’t impacted as a result of the project. The station was recently returned to service, and the project is anticipated to be completed in the early fall of 2024.