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.
11. Performance Based Training
Turbidity Profile
Raw Max Sed Max Filter Combined
100.0
Turbidity (NTU)
10.0
1.0
0.1
0.0
Jan-11 Feb-11 Mar-11 Apr-11 May-11 Jun-11 Jul-11 Aug-11 Sep-11 Oct-11 Nov-11 Dec-11
12. Source Water Evaluation
1. Organics/Manganese
2. Taste and Odor
3. Turbidity
4. Alkalinity
5. Farm Chemical Application
6. Bacteria/Cryptosporidium
13. 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
15. 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
16. 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.
