US Department of Interior HQ DC Reclamation and Re UseSept 3.72 41,850 $ 564.98 Oct 3.4 38,250 $ 516.38 ... (RDC) access via the local ... System Overview: • The CWS Makeup will

Rhode Island Convention Center • Providence, Rhode IslandRhode Island Convention Center • Providence, Rhode Island

US Department of Interior HQ‐DC Water Reclamation and Re‐Use

Session: Alternative Water Resources

Paul BassettWater Savers, LLCAugust 10, 2016

Rhode Island Convention Center • Providence, Rhode Island

Department of Interior HQ Water Reclamation Strategies

The Department of the Interior was the first building in Washington, D.C. authorized, designed, and built by the Roosevelt Administration. Construction began in April of 1935 and was completed in December of 1936 ‐ a record time for the building of a federal structure of its size and complexity.


Water Balance

Water Balance Table

% of Total

Modeled Consumption

(gal)

Modeled Consumption

(kgal)

Modeled Savings (gal)

Modeled Savings (kgal)

Toilets 23% 2,387,543 2,388 1,282,199 1,282Urinals 5% 530,565 531 464,244 464Faucets 2% 184,243 184 70,673 71Showers 0.3% 31,864 32 6,167 6Ice Machines 2% 156,516 157 0 0Pre‐Rinse Sprayers 0.8% 86,054 86 11,952 12Garbage Disposals 2% 165,834 166 94,122 94Convection Steamers 0.5% 47,808 48 0 0Dish Machines 0.2% 23,904 24 0 0Cooling Towers 63% 6,423,481 6,423 1,474,560 1,475Misc. and Unaccounted 2% 161,910 162 0 0TOTAL 100% 10,219,643 10,220 3,403,918 3,404

Actual Reported Consumption 10,219,643 10,220% Accounted For 100.0%

Overall Savings Percentage33.3%


Water Balance

Toilets, 23%

Urinals, 5%

Faucets, 2%

Showers, 0.3%

Ice Machines, 2%

Pre‐Rinse Sprayers, 0.8%

Garbage Disposals, 2%

Convection Steamers, 0.5%Dish Machines, 0.2%

Cooling Towers, 63%

Misc. and Unaccounted, 2%


Water Savings Summary

Department of the Interior

Savings Summary

Water Conservation Measures (WCMs)

Water/Sewer Savings

(gallons / yr)

Sewer Only Savings

(gallons / yr)

Water/Sewer Savings ($$ / yr)

Toilet Replacements 1,282,199 0 $17,112

Urinal Replacements 464,244 0 $6,196

Faucet Retrofits 70,673 0 $943

Showerhead Replacements 6,167 0 $82

Ice Machine Retrofits 0 0 $0

Pre‐Rinse Sprayer Replacements 11,952 0 $160

Garbage Disposal Retrofits 94,122 0 $1,256

Cooling Tower Sub‐Metering 0 4,337,461 $31,847

Cooling Tower Treatment Systems 1,474,560 0 $19,679

GWH System for CT Make‐up 4,576,561 0 $29,231

RWH System for Hose Bibb & Basement Restrooms Toilet/Urinal Supply 0 0 $0

Connections to Existing BAS System 0 0 $0

PROJECT SUBTOTALS 7,980,479 4,337,461 $106,506


Its what you cant see that matters the most

• Several underground sumps pits to capture ground water• 2-large sump pumps discharging water to storm sewer system


Measure and Verification

• Water flow were measured at 30 gallons per minute• 43,200 Gallons per day or 15,768,000 Gallons per year potential• Cooling tower annual make-up is 6,500,000 gallons per year


Ground Water Collection and Re-Use


Ground Water Collection and Re-Use


Groundwater Re-Use System


Water Reclamation System Overview


Groundwater Filtration System






Condenser Water Pumps and Filters


Rainwater Storage and Treatment


Rainwater Harvesting

18,000 Square Feet of Roof Surface


Rainwater Business Case Analysis

Month Ave RainfallPotential Rainwater Collection (GAL)

Water Cost @ $13.50 Kgal

Jan 2.81 31,613 $ 426.77

Feb 2.71 30,488 $ 411.58

Mar 3.48 39,150 $ 528.53

April 3.06 34,425 $ 464.74

May 3.99 44,888 $ 605.98

June 3.78 42,525 $ 574.09

July 3.73 41,963 $ 566.49

Aug 2.93 32,963 $ 444.99

Sept 3.72 41,850 $ 564.98

Oct 3.4 38,250 $ 516.38

Nov 3.17 35,663 $ 481.44

Dec 3.05 34,313 $ 463.22

TOTALS 39.83 448,088 $ 6,049.18


Rainwater System Layout


Rainwater Transfer Station


Rainwater System Layout


Rainwater Hose Bibs


Thank You

Paul BassettSenior Vice PresidentWater Savers, [email protected]


Water Reclamation and Re-Use Basis of Design

BASIS OF SYSTEMS DESIGNS1. Minimize the Use of Domestic Water for Cooling Tower Make‐Up, Landscape Watering, and Local Toilet‐Urinal FlushingDesign Solutions:• Reclaim Groundwater for Condenser Water System (CWS) Makeup • Reclaim Captured Rainwater for Landscape Watering and Toilet/Urinal Flushing• Reduce Condenser Water System Blowdown Rate and Volume2. Minimize Operator Requirements3. Provide Remote Monitoring CapabilitiesDesign Solutions:• Operator Control Room • Aqualogix Remote Monitoring (Aqualogix Smartview for Smartphone/Tablet) 4. Robust Datalogging Capabilities5. Building Automation and Control Network (BACnet) Integration (Read‐Only)

REMOTE MONITORING FEATURE:At the heart of the water savings measure, is the AQUALOGIX ™ control and monitoring system. This system continuously monitors important parameters of system operation. The controller contains sophisticated logic to accurately provide the needed output responses. Should any monitored parameter exceed a preset level, the system will alarm and/or send an email to facility operators and managers. Moreover, the controller supports Remote Desktop Connectivity (RDC) access via the local Ethernet and over the internet. With this remote access, Aqualogix engineers provide daily oversight ‐ adjusting program parameters as needed to provide optimal results.



CONDENSER WATER SYSTEM (CWS) MAKEUP1. System Overview:• The CWS Makeup will provide water to the CWS system for tower sump levels in the North and South Towers at DOI. The primary system water

source is reclaimed groundwater from existing sumps in the DOI central plant, and treated using a combination of filtration, softening, and Reverse Osmosis Demineralization. Secondary water source is softened city water. Treated water is pumped to an existing reclaimed 20,000 gallon storage tank before supplying the CWS. This system also provides a back‐up source to the rainwater system during low tank levels.

2. Water Source: Primary: Reclaimed GroundwaterSecondary: City Water

3. Water Treatment:• Optimization: Reclaimed groundwater and city water will be treated using a combination of processes, adjusted using dynamic controls that adjust to

changing water quality and system demand. Water source and treatment is adjusted and blended using smart controls, finding the optimum solution for best results and lowest cost of operation.

3.1. Groundwater Filtration• Dual Multimedia Filters with City Water Backwash3.2. Groundwater Softening• Dual Softeners with City Water Backwash and Monitored Regeneration Quality3.3. Groundwater Reverse Osmosis (RO) Demineralization • RO System with Heat Exchanger and Pre‐Filter3.4. CWS Sidestream Filter• Dual Multimedia Filters with City Water Backwash4. Pumping4.1. Groundwater Pump Skid• Duplex Pumps with strainers. Twin suction lines from existing groundwater sumps supplying water to the GW Treatment Systems.• Call for water signal from storage tank level control.4.2. CWS Makeup Pump Skid• Duplex Pumps. Suction lines from storage tank, discharge to CWS Tower Systems and Rainwater system backup.• Call for water signal from tank level controls in North and South Towers.4.3. CWS Sidestream Pump• Control interlocked to sidestream loop pressure and temperature



RAINWATER REUSE SYSTEM1. System Overview:• The Rainwater Reuse System will provide water for non‐potable use (exterior hose bibs for landscape watering

and toilet flushing). The primary system water source is reclaimed rainwater captured from existing roof drains from Wing 2, filtered, stored and chemically treated for re‐use. Rainwater is initially captured in a smaller transfer tank near the roof drain source before being pumped to a larger (5,000 gallon) rainwater storage tank centrally located in the central plant, where it is chemically treated for supplying water to the exterior hose bibs and additionally dyed for local male and female bathrooms outside the cafeteria. A secondary backup source to this system will be from water that is provided from the reclaimed groundwater CWS Makeup storage tank.

2. Water Source: Primary: Reclaimed Rainwater (call for water signal from RW transfer tank level control)Secondary: Reclaimed Groundwater/CWS Makeup3. Water Treatment:3.1. Rainwater Filtration• In‐Line Self‐Cleaning Vortex Filter3.2. Rainwater Chemical Feed• Sodium Hypochlorite Oxidant for Bacterial Control3.3. Rainwater Recirculation Control• Prevents stagnated water in Rainwater Storage Tank, improving water quality4. Pumping4.1. Rainwater Transfer Pump Skid• Duplex Pumps: Suction lines from RW transfer tank, discharge to RW storage tank. • Call for water signal from downstream flow meters.4.2. Rainwater Distribution Pump Skid• Duplex Pumps. Suction lines from RW storage tank, discharge to non‐potable systems • Call for water signal from downstream flow meters.• Expansion tank maintains distribution system pressure.

Documents

US Department of Interior HQ DC Reclamation and Re UseSept 3.72 41,850 $ 564.98 Oct 3.4 38,250 $ 516.38 ... (RDC) access via the local ... System Overview: • The CWS Makeup will