The Glenbard Wastewater Authority is currently in the process of rehabilitating and upgrading its primary clarification, sludge pumping, and gravity thickening operations. In late 2024, the 2025 Primary Clarifier Rehabilitation project was bid to replace infrastructure that was reaching the end of its service life, as well as to provide better operational controls for the Authority. This project includes the removal and replacement of both 110-foot clarifier mechanisms and sludge pumping equipment. The new pumps will be on VFD’s to better manage solids within the process and will have the option to be directly fed to the anaerobic digesters. In addition, the existing gravity thickener will have its equipment removed and replaced. The Authority elected to include launder covers on both clarifiers for odor mitigation and the removal and replacement of the gravity thickener dome with a new flat cover. The project also includes upgrades to the existing electrical equipment and SCADA system and the replacement of diversion structure gates. Construction is underway and is anticipated to be completed in early 2026.

In 2022, Trotter and Associates completed a Wastewater Facility Plan Update for the Village of Algonquin. The plan outlined several capital improvement projects, including replacing the High Hill Park Interceptor Sewer. The existing sewer is located within High Hill Park Nature Preserve, along the banks of Ratt Creek, and adjacent wetlands. The Village requested a supplemental sewer relocation study be completed to evaluate alternative routing of the interceptor. Upon completion of the project, over a mile of 8-inch and 10-inch sewer will be replaced with 16-inch and 18-inch sewer. The new interceptor will be located along an adjacent street and the rear yards of residential properties, relocating the sewer from the banks of the creek, outside the nature preserve, and wetlands. This will provide the Village with improved access for future maintenance and an increased capacity for continued growth within the Village. 

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.