City of Oshkosh

City of Oshkosh

Location: Oshkosh, WI

The Algoma Sanitary District No. 1 is located northeast of Oshkosh, WI. They have turned to Tonka Water for their three most recent treatment systems.

In 2004 the District installed its first Tonka Water treatment system, which included a 400 gpm OptaCell™ pressure system with a hydropneumatic tank. The system was designed to remove iron from the groundwater supply, and once the system was commissioned, it provided safe drinking water to about 50 homes in the area.

In 2005 and 2009 the District installed its second and third Tonka Water treatment systems. This system incorporated Tonka Water OptaCell™pressure filters to remove iron and radium using Tonka Water’s TonkaZorb™ Hydrous Manganese Oxide (HMO) process. Today the Algoma Sanitary District supplies safe drinking water to 900 homes and has a maximum capacity to supply water to an additional thousand.

The treatment processes for the most recent additions are similar since they both are designed for iron and radium removal. Both treatment systems consist of pressure aeration for iron oxidation, followed by sodium hypochlorite injection to assure complete iron oxidation. Following chlorine injection, TonkaZorb™ HMO is injected ahead of a OptaCell™ pressure filter. The chemically treated raw water is filtered through a 30” bed of Tonka Water IMAR™ media, which is specifically designed for radium removal.

The treatment systems utilize TonkaZorb™ HMO, a pre-mixed, pre-formed Hydrous Manganese Oxide solution, which is delivered to the Sanitary District in a ready-to-feed form.  The design system dosage rate of HMO was 1.0 mg/l, but since plant start-up, the dose has been optimized to approximately 0.25 mg/l, all the while meeting combined Radium 226 & 228 MCL standards.

The treatment process has been highly efficient in delivering quality water which exceeds current EPA standards for radium, as well as secondary standards for iron. Typical results are listed below. 

Raw Water
Finished Water
Iron (Fe)0.88 mg/L<0.02 mg/L
Combined Radium (226/228)9 pCi/L<0.5 pCi/L
Gross Alpha 13 pCi/L<5 pCi/L

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