Village Of Montpelier Water Treatment Plant Merged

Village of Montpelier Water Treatment Plant Making the “World’s Best Tasting Water” Even Better

Defining Our Goals ¾Maintain High Quality and Reliability ¾Solidify Existing Finished Water Capacity

Desired current capacity of 2 MGD

z

¾Plant Operations Consideration ¾Consider Future Expansion Capabilities

Expansion capability to 4 MGD

z

Existing Raw Water Source ¾Evaluating The Existing Raw Water Source

Existing Well Field Capacity

z

•Historical Firm Capacity = 1.4 mgd

Limitations of Existing Well Field

z

•Minimum well isolation distances •Contamination potential

Recommendation

z

•Consider New Well Field Site

New Well Field Considerations ¾Evaluation Completed

Geology of the area

z

•Favorable conditions for wells yielding 1 MGD capacity •High water quality •Best of Both Worlds (High Yield, Good Quality)

Land Availability

z

•Ability to meet isolation distances

Proximity to treatment plant zPotential for aquifer contamination z

Existing Treatment Plant ¾Evaluating The Existing Treatment Plant

Treatment Capacity

z

•Per 1940 standards, plant capacity was 1.5 MGD •Per present day standards, noticeably less

Limitations of Existing Facilities

z

•Treatment processes generally undersized •Lack of redundancy for some processes •Major renovations to existing structures required •Physical site limitations

Recommendation

z

•Consider New Water Treatment Plant

New Water Treatment Plant Considerations ¾Evaluation Completed Design around our goals zProvide Flexibility zLocation zOther Advantages z

•Utilize current technology •Minimized construction interruptions •Construction duration •Anticipated costs

Decision to Proceed with Alternate Source and Treatment ¾What We Needed To Do

Site Location zPreliminary Hydrogeologic Work zConfirm Capacity and Quality zWater Characteristics and Treatment Process Selection z

Major System Components Major System Components ¾Raw Water Wells ¾Softening / Iron Removal ¾Recarbonation ¾Filtration ¾Disinfection ¾Clear well Storage ¾High Service Pumps / Backwash Pumps

Process Flow Diagram

Raw Water Well

Softening & Recarbonation Basins

Cluster Filters

The Recipe For The World’s Best Tasting Water

¾Have A Dedicated Treatment Plant Staff

Blend The Water From One Of The Country’s Finest Aquifers With A Carefully Measured Portion Of Lime And Mix. ¾Allow To Settle ¾Transfer To Recarbonation Basin, Let Set Until Stable ¾Filter ¾Disinfect and Serve.

To End Up With The World’s Best Tasting Water, Your Source Must Be Up To The Challenge ¾The aquifer the village draws from

contains what is most likely the finest water in this part of the country. Average Alkalinity of 305 mg/L zAverage Harness of 308 mg/L zIron Nominally 1.2 mg/L zTrace Amounts of Sulfides z

Ohio’s Aquifers We Are Here Unconsolidated and Confined ¾Lots of Sand and Gravel Between Clay Above and Bedrock Below

The Treatment Process Precipitative Lime Softening Table 1

The Target

Montpelier, OH - Water Treatment Plant Raw and Finished Water Quality

Parameter

Average

Average

Raw

Finished

Water

Water

Total Hardness (as CaCO3)

308 ppm

122 ppm

Total Alkalinity (as CaCO3)

305 ppm

120 ppm

Iron

1200 ug/l

ND

59 ug/l

ND

Manganese

The Treatment Process Precipitative Lime Softening Why Use Lime? zIt takes up more space, it requires more equipment, the process requires more attention. zLots of reasons not to. zThen Why? z

The Treatment Process Aesthetics! Lime accomplishes what needs to be done without replacing what’s good for you with something not so good. zIt leaves no unwelcome oxidation byproducts behind. zIt makes restoring the stability after treatment a simple process that does not require the addition of anything foreign. z

The Treatment Process Precipitative Lime Softening Two EIMCO Clarifiers (aka. The Mixers) zTheir Not Voodoo, But It May Seem Like It Before You Get Them Figured Out. z

The Treatment Process Recarbonation Precipitative softening requires the elevation of the pH to a point where a portion of the calcium and magnesium compounds remaining after treatment will require little coaxing to come out of solution. zRecarbonation allows the stability of the water to be restored and allows the staff to tweak the stability indexes. z

The Treatment Process Filtration ¾Filtration is accomplished with a set of cluster filters. ¾Some swear by them, others at them. ¾Overall, they are well suited to the needs here.

The Treatment Process Disinfection ¾Gaseous Chlorine is disinfectant of choice ¾It has safety issues when compared to hypochlorite. ¾The primary advantage is the compactness of storage. ¾The primary disadvantage is its impact on the alkalinity and pH (That’s why we have recarb)

The Treatment Process Now That You Know How We Make The World’s Best Tasting Water, We Need A Place To Keep It. For That, We’re Going To Hand It Over To:

NATGUN