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The speakers will address the differences between row crops and permanent pasture regarding the amount of sediment and pollutants that wind up in the Lake Rathbun and discuss the challenges of removing some substances from the water so that it meets their high standards for potability.
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Rathbun Regional Water Association, Inc.
Water Treatment PlantSource Water Evaluation
Chariton River WTP Intake
Overview of Treatment
Principles of Operation
• Oxidation and Precipitation• Coagulation• Flocculation• Sedimentation• Filtration• disinfection
SuperPulsating Clarifiers
Solids Contact Basins
Chemical Feed
Filtration
High Service
Analyzers
Performance Based Training
Jan-11 Feb-11 Mar-11 Apr-11 May-11 Jun-11 Jul-11 Aug-11 Sep-11 Oct-11 Nov-11 Dec-110.0
0.1
1.0
10.0
100.0
1000.0
Turbidity ProfileRaw Max Sed Max Filter Combined
Tu
rbid
ity
(NT
U)
Source Water Evaluation
1. Organics/Manganese2. Taste and Odor3. Turbidity4. Alkalinity5. Farm Chemical Application6. Bacteria/Cryptosporidium
Organics and Manganese
• Often Bound together• Removal contrast based on pH (TOC/Mn)• Sodium Permanganate• Rainfall events push organics into lake
– Leaves, trees, brush, etc.• Lake stratification promotes Mn build up• Low dissolved oxygen concentration
– New Caisson provide relief from lake bottom
36 “ Screened Intake
Taste and Odor
• Spring flush of nutrients into lake• Dry summers influence stratification
– Sunlight penetration due to settling• Geosmin and Methoisoborneol -2 (MIB)
– Encapsulate in blue-green algae cell walls– Release when cyanotoxins are present
• Phosphorus reduction can help
Turbidity
• Very low turbidity is hard to treat (< 5ntu)• High turbidity can be expensive (>100ntu)• Rathbun range is 3 – 500 ntu. Avg. is 25 ntu.• Sediment removal is a great benefit.• Rainfall events > 1” above and below intake
are detrimental to optimization.
Discharge 2010
Alkalinity
• Requirement for coagulation buffer– 0.5 mg/L plus 35 mg/L residual
• Extreme flooding (2007-2008) downstream• Rathbun uses Sodium Hydroxide to buffer
– 1.65 mg/L dosage to achieve 1 ppm residual
New Caisson
Farm Chemical Application
• Atrazine and Nitrogen• Nearly eliminated since RLWA improvements• Carbon caps on filters• Powder Activated Carbon
Syngenta Atrazine
Bacteria/Cryptosporidium
• Manure Runoff• Ecoli and Fecal Coliform• Chlorine Demand• 4-log removal of crypto• Conservation practice to maintain low influent
Questions???• [email protected]
• (800) 233.8849
• www.rrwa.net
• www.rathbunlandwateralliance.blogspot.com
