New Technologies in Wastewater Treatment The Impact to O&M Staff “New Directions in Wastewater Treatment” October 21 st, 2014 Art Nunez Water Reclamation Director

Presentation Overview Scottsdale Wastewater Treatment History & Background Advanced Technologies Implemented Development and Implementation Challenges O&M of Advanced Technologies Lessons Learned

City of Scottsdale History Prior to October Small WWTP’s –Gainey Ranch WRP 1.7 mgd –Troon Village WRP 0.4 mgd SROG Reliance –Majority to Phoenix

City of Scottsdale Background Planning & Opportunity –1990’s Experienced Tremendous Growth –Integrated Water and Wastewater Master Planning –Complicated Challenges –Innovated Concepts –Advanced Technologies

Integrated Water Resources Planning Water Campus Demand and Supply WaterWastewater Water Quality

Scottsdale Water Campus 145 Acre Site 70 mgd Surface WTP 23.6 mgd WRP 20 mgd AWT Indirect Potable Reuse 6

Wastewater Treatment Components Reuse –Conventional NDeN –Tertiary Treatment Recharge –Vadose Zone Recharge –Additional AWT

WRP / AWT Facilities Phase I - October of 1998 –5 Expansions –Capacity & Technologies Advancing Technologies Regulatory Driven

Advanced Water Treatment Components Ultrafiltration Reverse Osmosis Ultraviolet Photolysis pH Stabilization Vadose Zone Recharge Wells Disinfection Process –Step Chloramination sodium hypochlorite generation / ammonia –Ozonation

Microfiltration System Membrane Technology Implementation Cutting Edge Pretreatment to RO Original Memcor 90M10C System

Current Ultrafiltration System Expansion & Upgrade 2012 Same Foot Print Memcor CP Low Pressure Membrane Filtration System –New Module Composition –New Backwash Process –New CIP Process

Ultrafiltration O&M Impact Research & Testing –Pilot to Implementation Training –Acceptance Testing –Performance Testing –Contractor Training Staffing & Recruitment –MIT, AHT, MW, TMP –Array, Sonic Test, Permeability, Lumen –Modes of Operation Maintenance –I&C –Mechanical –Electrical –Pneumatic Valves Data Collection –Warranty Impacts

Reverse Osmosis System Original RO –Transfer Pump Station –Chemical Feed Acid & TI –3 Cartridge Filters –6 Individual Trains 85% –Flushing & CIP –Post Stabilization Three Expansions Later – 2012 –20 mgd Capacity –Expanded Chemical Feed –8 Cartridge Filters –17 Trains –14 - 8” / ” –3 Different Membrane Manufacturers –Expanded Flushing, CIP and Post Stabilization

Reverse Osmosis O&M Impact Research & Testing –Pilot to Implementation Training –Acceptance Testing –Performance Testing –Contractor Training Staffing & Recruitment –Existing VS New –8” VS 16” Diameter –Terminology Maintenance –I&C –Mechanical –Electrical Data Collection –Warranty Impacts

Ultraviolet Photolysis UV Experience –Disinfection –Channel System New Application –Medium Pressure –Inline System –Compliance Driven –1-Log Removal of NDMA N-nitrosodimethylamine

UV O&M Impact Straight Forward –Previous Experience Training –Acceptance Testing –Performance Testing –Contractor Training Staffing & Recruitment –Less of an Impact Safety Discussion Maintenance –I&C –Electrical Data Collection –Warranty Impacts

Disinfection Modifications Step Chloramination –Reduce Formation of NDMA New Application Points Gas cl2 Conversion Sodium Hypochlorite Generation –4 X 1500 ppd

Disinfection O&M Impact MOPO –18 month impact Temporary System Small Foot Print Compliance Challenges Consistent Cleaning & Maintenance Pressurized Loop Control

Ozone Generation Purpose of Ozone –Oxidation of NDMA precursors –Compounds of Potential Concern (CPCs) through advanced oxidation. Primary Components –LOX Tank –Vaporizer –Ozone Generators –Cooling Water –Side Stream Injection –Ozone Destruct

Ozone O&M Impact - MOPO Major Plant Modifications Major Components O/S for 6 Months Compliance Challenges

Ozone O&M Impact Challenges Maintaining Operations Control Logic Application Point VS Chloramination Application Point

Ozone O&M Impact – I & C Low Level Ambient Ozone Analyzers Monitoring Destruct Discharge Auto Shutdown

Ozone O&M Impact – Safety Ozone Odors OSHA Guidelines LOX Destruct Media

Additional Technologies Vadose Zone Recharge –63 wells 2 designs pH Stabilization –Lime addition –Decarb Towers Turbo Blowers –Process Air Oxygen Injection –Odor Control Disk Filters –Tertiary Treatment

Impacts to O & M – After the Fact Focus on Benefits of New Technology Difficult to Identify O & M Impacts Or They’re Often Overlooked Proprietary Equipment Limited Applications Lack of Experienced Staff Lack of History

Lessons Learned Include O & M Staff –Concept –Pilot –Design –Construction MOPO Development –During Design Delivery Mechanism –CMAR Consideration Training –Timing / Follow Up –Technical Expert VS Trainer –Designer Involvement Manufacturer Selection –Include Intangibles –Not Just Cost –Local Representation –Installation History Procurement Departments Warranty Development –Full Understanding Establish Relationships –Designers –Contractors –Manufacturers

Questions ?