by John Berrigan
Tonka Equipment Company
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| Roosevelt Warms Spring Institute |
A Blog on Water Treatment Issues and Solutions for the Municipal, Industrial and Government Water Markets.
Thursday, May 5, 2011
Healing Waters Steeped in History
by John Berrigan
Tonka Equipment Company
Friday, March 25, 2011
Friday, January 14, 2011
Nitrate Removal at Hastings, Minnesota
by Todd Butz
VP Sales, Tonka Equipment Company
Set along the rugged and colorful scenery of the Mississippi, St. Croix and Vermillion Rivers, Hastings is a river town steeped in tradition. With a rich heritage of progress, Hastings has grown to meet the needs of its population without forgetting its past. This certainly rings true for how the community has handled its water treatment system.
Nitrates in the groundwater supply
Hastings is fortunate to have a plentiful groundwater source capable of supplying the community of over 22,000 residents with adequate water capacity. The groundwater quality is pristine with very little iron and manganese – below secondary standard levels. However, Hastings is located in a highly agricultural area, and over time, the nitrate concentration in several of its wells has increased to levels near the EPA mandated MCL of 8 mg/l. To remain in compliance, the town made the decision to construct a new water treatment plant for nitrate removal, the first of its kind in Minnesota.
Anion exchange treatment
Working closely with the consulting engineer throughout the design phase of the project, Tonka supplied the entire anion exchange treatment system including: anion exchange vessels, valves, facepiping, instrumentation, brinemaker, brine delivery components, control system methodology, and a softening system for brine make-up water to prevent calcium sulfate precipitation.
Hastings finished water meets EPA standard now and in the future
The plant utilizes four anion exchange vessels, each rated to treat up to 400 gpm. A portion of the 2400 gpm total plant flow is treated through the units while the balance is bypassed around the anion exchange vessels and blended with the treated water to produce a consistent finished water with nitrate concentration below the EPA’s MCL of 8 mg/l. The bypass/blend allows the town to remain in compliance today, as well as having the flexibility to adjust the treated/bypassed proportion for future compliance, should the raw water nitrate level continue to increase.
VP Sales, Tonka Equipment Company
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| Hastings Ion Exchange System for Nitrate Removal |
Set along the rugged and colorful scenery of the Mississippi, St. Croix and Vermillion Rivers, Hastings is a river town steeped in tradition. With a rich heritage of progress, Hastings has grown to meet the needs of its population without forgetting its past. This certainly rings true for how the community has handled its water treatment system.
Nitrates in the groundwater supply
Hastings is fortunate to have a plentiful groundwater source capable of supplying the community of over 22,000 residents with adequate water capacity. The groundwater quality is pristine with very little iron and manganese – below secondary standard levels. However, Hastings is located in a highly agricultural area, and over time, the nitrate concentration in several of its wells has increased to levels near the EPA mandated MCL of 8 mg/l. To remain in compliance, the town made the decision to construct a new water treatment plant for nitrate removal, the first of its kind in Minnesota.
Anion exchange treatment
Working closely with the consulting engineer throughout the design phase of the project, Tonka supplied the entire anion exchange treatment system including: anion exchange vessels, valves, facepiping, instrumentation, brinemaker, brine delivery components, control system methodology, and a softening system for brine make-up water to prevent calcium sulfate precipitation.
Hastings finished water meets EPA standard now and in the future
The plant utilizes four anion exchange vessels, each rated to treat up to 400 gpm. A portion of the 2400 gpm total plant flow is treated through the units while the balance is bypassed around the anion exchange vessels and blended with the treated water to produce a consistent finished water with nitrate concentration below the EPA’s MCL of 8 mg/l. The bypass/blend allows the town to remain in compliance today, as well as having the flexibility to adjust the treated/bypassed proportion for future compliance, should the raw water nitrate level continue to increase.
Tuesday, December 14, 2010
Sometimes Air and Water Don’t Mix
by Steve Kari
Tonka Equipment Company
Moisture in compressed air systems can cause problems with pneumatically controlled devices, such as valve actuators and control solenoids.
Compressed air supply systems in this industry traditionally have been specified and supplied with refrigerated air dryer systems to remove excess moisture from the air. These systems rely on a refrigeration system to cool and condense moisture from the air stream.
We have learned through extensive investigation that these systems work most effectively if the application has a constant and steady air flow, such that the entire refrigeration system stays cold. We have therefore concluded that refrigerated air dryer systems are most appropriate for applications where air is consumed, such as systems where modulation valves or pressure
aerators are used.
Tonka Equipment Company
Moisture in compressed air systems can cause problems with pneumatically controlled devices, such as valve actuators and control solenoids. Compressed air supply systems in this industry traditionally have been specified and supplied with refrigerated air dryer systems to remove excess moisture from the air. These systems rely on a refrigeration system to cool and condense moisture from the air stream.
We have learned through extensive investigation that these systems work most effectively if the application has a constant and steady air flow, such that the entire refrigeration system stays cold. We have therefore concluded that refrigerated air dryer systems are most appropriate for applications where air is consumed, such as systems where modulation valves or pressure
aerators are used.
Tuesday, November 30, 2010
New Ultrafiltration Membrane Treatment Pilot System in West Virginia
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| Ultrafiltation Membrane Pilot |
The Tonka UF membrane pilot trailer is a self-contained unit suitable for either existing applications or “greenfield” sites. We pull it up, drop it, connect power, drainlines and water source, and it’s ready to go. The pilot unit can tackle surface water with organics as well as groundwater sources with iron and manganese and other contaminants. The Dow UF membranes also provide removal credits for cryptosporidium, giardia and viruses under the limits as determined by State regulators.
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