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Unconventional Applications of Wastewater Effluent Reuse

Unconventional Applications of Wastewater Effluent Reuse. By: Brian J. Ambrogi, E.I., Wilson & Company, Inc. And Dan Campbell, Raton Water Works Presented to: Rocky Mountain WEA/AWWA Annual Conference, Casper, Wyoming September 17, 2003. Raton, New Mexico. Raton, New Mexico. Background:.

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Unconventional Applications of Wastewater Effluent Reuse

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  1. Unconventional Applications of Wastewater Effluent Reuse By: Brian J. Ambrogi, E.I., Wilson & Company, Inc. And Dan Campbell, Raton Water Works Presented to: Rocky Mountain WEA/AWWA Annual Conference, Casper, Wyoming September 17, 2003

  2. Raton, New Mexico

  3. Raton, New Mexico

  4. Background: • Existing system serves approx. 7,400 residents • WWTP design capacity = 0.9 MGD • WWTP existing discharge points • Doggett Creek - Year round • Existing reuse sites (golf course & athletic fields) - irrigation season only

  5. Initial Solution: Eliminate discharge to Doggett Creek and implement 100-percent reuse. Initial Problems: • Effluent to Doggett Creek does not comply with water quality standards. • Unidentified toxin in effluent • Only occurs in Doggett Creek • Not found in effluent at golf course

  6. Approach: • Need to identify additional reuse locations • Golf course • Median irrigation • Irrigate range lands • When is there demand for effluent reuse? • Winter months no irrigation • Summer months 100% of demand

  7. What is to be done with effluent during winter months? • Storage until irrigation season • Impoundment of effluent for approx. 5 months • Need to use all stored effluent by end of irrigation season. • Unconventional reuse • Once through cooling water in Co-generation electrical power plant.

  8. Course of Action: • Construct impoundment - retention lake located south of WWTP • Improve tertiary treatment of effluent to publicly accessible locations • to meet recently adopted NMED policy • Allows more flexibility in reuse applications

  9. Construct Impoundment - Retention Lake Located South of WWTP • Surface area = 24 acres • Volumetric capacity = 410 ac-ft per year • Storage depth = 20 ft • Earthwork volumes: • 654321 c.y. of fill • 123456 c.y. of cut

  10. Proposed Lake Location

  11. Storage Consideration of Effluent In Open Lakes • Potential problems Algae, Phytoplankton, re-growth of microorganisms, high levels of turbidity and color, and deterioration of water quality due to aquatic life. • How to address problems • Cleaner effluent into lake • Flow through lake • Development of lake management plan

  12. Improve Tertiary Treatment of Effluent to Publicly Accessible Locations • Replacement of disinfection system • Addition of filtration System • NMED policy, August 2003 • 4 classes of effluent, 1A, 1B, 2, & 3 • 1A & 1B publicly accessible • 2 & 3 publicly restricted • Allows more flexibility in reuse applications • Difference between application of classes 1A & 1B

  13. Disinfection Design Consideration • Ultraviolet Vs. Chlorine • Chlorine residual advantage at filter building • Lake effluent too turbid for U.V. • No residual from U.V. • Safety issues • Chlorine generation Vs. chlorine gas • Liquid feed possible alternative . . .

  14. Filtration Design Considerations • 1. Site considerations • Small elevation change • Existing lines at capacity • Filter following treatment, not storage • 2. 3-filter types considered: • Gravity Sand Filter • Tall profile • High headloss • Traditional process • Pressure Filter • Extremely high headloss • Disc Filter • Small foot-print • Low profile, headloss • High capacity

  15. Proposed Tertiary Treatment Processes • Selected Disinfection System • Chlorine Generation at Filter Building and Lake Disinfection Building • Selected Filtration System • Disc Filtration following treatment process. • Initially Only Effluent to Golf Course and Athletic Fields Filtered

  16. to Golf Course/ Athletic Fields L.S. to Golf Course/ Athletic Fields Filter WWTP Disinfection Unit in Filter Bldg. E.Q. Basin 700-gpm Pumps to Lake Retention Lake Lake By-Pass Line Disinfection Bldg. Co-Generation Electrical Plant Schematic of Proposed Reuse System

  17. Unconventional Reuse – Cooling Water for Co-Generation Electrical Facility • Cogeneration Electrical facility Described: • Considered “Green Energy” – Process of electrical power production that is environmentally beneficial. • Use of deadfall in regional national forests to provide fuel source. • Deadfall to be mechanically cleared and transported to co-generation facility.

  18. Water Quality Issues • Problems resulting in cooling water include. • Scaling. • Metallic corrosion. • Biological growth. • Fouling of equipment. • Raton will provide effluent of high enough quality to reduce amount of biological growth and fouling. • Agreed to provide NPDES quality effluent to co-generation facility. • Co-generation facility will handle scaling and metallic corrosion treatment.

  19. Summary of Improvements • Storage • 410-ac ft. retention lake • Tertiary treatment • Chlorine generation • Filtration • Effluent to co-generation facility • Effluent from Lake and/or by-pass line • Disinfection of effluent from lake

  20. Proposed Timeline • Reuse improvements design completed by – December 2003 • Reuse construction started by – April 2004 • Co-generation facility construction started in – 2005

  21. Questions?

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