City of Oberlin, Ohio
The City of Oberlin retained Burgess & Niple (B&N) to conduct preliminary engineering studies for improvements to the raw water pumping station, off stream reservoir, and water treatment plant – facilities originally designed by B&N in the early 1960s. In addition to basic capital improvements, the treatment processes were evaluated with respect to regulatory requirements, such as the Disinfectants/Disinfection Byproducts Rule (D/DBP) and the Long Term 2 Enhanced Surface Water Treatment Rule. The City was reporting elevated disinfection by-products in the distribution system and compliance with these regulations was of particular concern.
B&N took a three-phased approach to reducing the quanitity of D/DBP, considering optimization techniques and potential process changes for each major element of the system: raw water quality, treatment processes, and distribution. By optimizing the raw water pumping to the reservoir and from the reservoir to the plant, introduction of nutrients and contaminants could be minimized.
B&N completed the detailed design of water treatment plant improvements, including the replacement of most process equipment in the plant. Plant improvements also include a new SCADA system, new HVAC equipment, new motor control center and transformers, and an expanded laboratory. Additional UV disinfection with Ohio EPA credit for Inactivation of Cryptosporidium under LT2ESWTR was also provided.