1. Town of Taos / Taos Valley Regional Wastewater Treatment Facility MBR Upgrade Emerging Technologies 2012 Infrastructure Finance Conference Kari Edenfield, PE – Souder, Miller & Associates

2. Headworks – no change Aeration basins – divided into anaerobic (no oxygen) and aerobic (oxygen) sections. MBR basins Additional aeration with for concentrated biomass Pumps will pull water through hollow fiber membranes No more clarifiers for settling solids Recycle biomass – no change Effluent and Solids – no change (UV to golf course and arroyo; solids thickening/processing) MBR Upgrade Project Description

3. Funding Grant and Loan funding combination Water Trust Board (2 funds): Grant: $3,570,000; Loan: $730,000 American Reinvestment and Recovery Act of 2009 (ARRA): Grant: $2,100,000; Loan: $1,000,000 Match Amount Total: Grant: $5,670,000; Loan: $1,730,000

4. MBR Selection Similar or lower costs Combines aeration, clarification and filtration into a single step (reduced footprint-25% size of conventional plant) Less process steps to monitor, lower energy costs, best quality effluent Influent Head works Aeration Tertiary Treatment Clarifiers UV Effluent Head works Aeration /Anoxic basin Influent MBR UV Effluent Conventional Treatment MBR Alternative

5. Process Flow

6. Membrane Treatment GE/Zenon ZeeWeed 500D Module – Immersed Hollow-Fiber Ultrafiltration Technology Nominal Surface Area = 340 sq ft/module 48 Modules per Cassette table ParameterInfluentNPDES Permit Requirements Current Treatment Future Permit Requirements MBR BOD250 mg/l< 30 mg/L2-15 mg/L< 10 mg/L< 1 mg/L TSS300 mg/L< 30 mg/L3-16 mg/L< 10 mg/L< 1 mg/L TKN30 mg/L< 3 mg/L Ammonia20 mg/L< 1 mg/L Nitrates2-18 mg/L< 10 mg/L< 3 mg/L Fecal Coliform per 100 mls > 1000< 1002 – 124< 50

8. Train Components Four Trains with five slots each for 20 total slots 16 Cassettes currently with buildout of four more

10. Photovoltaic Array 79.2 kW array (360 panels @ 220 W each) Roof slope = 1:12 for more direct exposure Cost = approx. $560,000 Portion of Green Component (of ARRA 2009 funding) Mounted 2’ above roof for airflow and increased efficiency Tied in to grid (not direct use)