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September 2, 2020

AWWA Wisconsin Conference to Feature Donohue Presenters

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Three Donohue personnel are presenters at the American Water Works Association Wisconsin Virtual Conference being held September 16-18, 2020.

Allen Williams: State-of-the-Art Water Treatment Facility Providing Greater Water Quality Protection and Flexibility for Future Expansion

Allen’s presentation details the new 9.0‑million-gallon-day (mgd) drinking water facility currently being constructed in Wausau, Wisconsin. His presentation will discuss the process design, layout, method of achieving each treatment goal, and design performance of each unit process.  

The City of Wausau is constructing a new drinking water treatment facility to address various issues with their existing facility. Relocation to a new site provides addresses clearwell deficiencies, aging infrastructure, water quality protection for groundwater under the influence of surface water, flood zone concerns, and space for future regionalization or additional level of treatment. The system includes six wells with a maximum water production rate of 9 mgd. The wells are shallow, with water depths approximately 25 to 50 feet below grade. The water quality of the wells averages around 1 mg/L iron, 2 mg/L manganese, and 5 mg/L total organic carbon (TOC).

The City and engineering team of Becher-Hoppe/Donohue completed facility planning, pilot testing, and design. The new facility will include unique combination of treatment technologies to address water quality concerns. The treatment goals include 3 log removal of cryptosporidium and giardia; 4 log virus inactivation; 35% removal of TOC; less than 15 true color units; less than 0.05 mg/L iron; and less than 0.05 mg/L manganese. The process includes aeration, flocculation, settling, filtration, anion exchange, primary and secondary disinfection, above ground clearwells, fluoridation, and corrosion control. The $38M construction project broke ground in July 2020 and is slated for completion in early 2022. The project is being funded with a State of Wisconsin Safe Drinking Water low interest loan, which includes $500,000 in principal forgiveness.

Allen Williams is a process engineer and project manager in Donohue’s Milwaukee office. He received a bachelor’s degree in biological engineering from the University of Missouri and a master’s degree in civil engineering from Marquette University.

Andrew Dow: Removing Dissolved Organic Matter from Water Supplies: A Case Study in Pilot Testing and Process Selection

Pilot Testing Equip Andrew Dow309x163

This presentation will cover the evaluation and selection of alternatives for NOM removal from drinking water, using a case study based on pilot testing and design engineering for a 9-mgd groundwater system, where the local water supply presents the challenge of treating high levels of inorganic contaminants, particularly manganese, along with elevated levels of NOM.

The presentation begins with a brief overview of the various technical approaches available for NOM removal in drinking water, while highlighting important considerations for process selection such as co-contaminants to be removed, use of oxidants, variability of raw water parameters, residuals generation, and system hydraulics. Results from initial bench testing and five months of pilot testing (completed in June 2019) will be presented to illustrate how three treatment approaches were evaluated for color and dissolved organic carbon removal. Pilot columns of granular activated carbon and anion exchange resin were operated in parallel to verify and differentiate the performance and life cycle costs of the two technologies. Anion exchange was identified as the preferred treatment approach for this water supply based on operating costs, process reliability, and the achieved reductions in color, TOC, and DBP formation potential. 

Andrew Dow is a water and wastewater process engineer for Donohue and Associates. He received his Bachelor of Science degree in chemical engineering from Stanford University and a master’s degree in civil and environmental engineering from UC-Berkeley. He has completed design and planning work for several water treatment facilities in the Great Lakes region in his work with Donohue over the past six years.

Mike Stohl: The Quest for Reliable Water

Beyond the footprint of the Mahomet Aquifer, sources of groundwater in south-central Illinois are often limited to relatively shallow, thin unconsolidated deposits. Production rates from well fields in these settings are limited by available drawdown. In the right setting, radial collector wells can provide an efficient method to produce high quality groundwater from relatively thin sand and gravel deposits. This presentation describes the results of a design study performed near Lincoln, Illinois South Well Field.

Mike Stohl is a senior electrical engineer based out of Donohue's corporate office in Sheboygan, Wisconsin. He earned his Bachelor of Science degree in electrical engineering from the Illinois Institute of Technology.

For more information on the conference please visit https://www.wiawwa.org/page/AnnualConference

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