Plan for Future Treatment Capacity
HR Green led a consultant team that completed the facilities planning, design, permitting and construction observation for a new sanitary sewer and wastewater treatment system for the Village of Richmond, Illinois. Richmond had experienced rapid development and required new wastewater treatment facilities to accommodate future growth. The new wastewater system includes a central lift station and force main to replace the old WWTP that was demolished as part of this project, a new 0.5 MGD WWTP located two miles downstream of the old WWTP, and an effluent lift station and force main that transfers the treated effluent to the original NPDES discharge point. This effluent force main serves an additional function as the main component of the effluent reuse distribution system.
The receiving stream is Nippersink Creek, home to a number of unique and endangered species of fauna and biota. Discharging to the Nippersink necessitated achieving a high quality treated effluent, in particular, the removal of ammonia nitrogen.
A Technical Advisory Committee (TAC) was formed to complete the planning and review process involving representatives from the EPA, IDNR, McHenry County Conservation District, The Sierra Club, The Defenders (a local environmental group), the Open Lands Foundation, the Village of Richmond and the project design team. As a part of the planning process, HR Green conducted an antidegradation study to weigh the impact of the future discharges from the Richmond treatment facilities on the quality of the waters of the Nippersink Creek. HR Green was the first to perform such an in-depth study in the State of Illinois. The study is now used as a guideline model for the IEPA for all communities looking for discharge permit application or expansion.
HR Green designed a complete wastewater treatment plant comprised of preliminary treatment facilities, intermediate and effluent pumping facilities, extended air activated sludge facilities and sludge stabilization/management facilities. The treatment process is based around the oxidation ditch extended air activated sludge system. The facilities have also been planned to allow for increased future flows to a 1.0 MGD capacity through the conversion of the outside oxidation ditch ring to activated sludge duty. Until future flows require this capacity, the outside ring will be used for temporary sludge storage.