water balance study

Water Balance Study

Water Treatment, Management and Conservation Solutions

Project Overview

Two Primary Objectives

1. Balance the Internal Water Usage with Purchased and Discharge Water Volumes.

2. Look for Opportunities To Reduce Water Usage and Conserve Utilities

Methodology1. Introduction and Site Survey

2. Compile Existing Information; Meter Readings, Site Drawings, Usage Estimates, Etc.

3. Generate List of Water Users by Department

4. Gather Purchased Water Usage Data

5. Preliminary Balance, Data Verification and Revisions

6. Final Water Balance

7. Provide Recommendations For Water and Energy Conservation.

Resources

Significant Information and Data are required to execute study Introduction, Site Overview, Site Specific Details

Purchased & Discharge Water Data

Resources

Departmental InterviewsHDM – LDD – HVAC – Sytech –Wastewater Treatment –LDD Tech Center – Emissions Solutions –

Resources

Drawings; RB-28 – Water Meters & Mains RB-28 (TIFFY) – Combined Sewer RB-30 – Plant 1 Storm Sewers RB-31 – Sewers Surrounding Facility RB-65 – Parking Plan with Gate #’s

Water Supply & Discharge

An Overview Of Water Sources and Discharge Points.

Water Sources

There are nine (9) water meters being monitored by the city. They are designated as follows:Meter # Size Location Description

Meter #1 6” Incoming City Water

Meter #2 3” DEDUCT - Tower Makeup Water

Meter #3 6”ADD BACK - Tower Blowdown & Filter Backwash

Meter #4 4”ADD BACK - Tower Blowdown & Filter Backwash

Meter #5 10” Incoming City Water

Meter #6 4” Incoming City Water

Meter #7 3” Incoming City Water - Irrigation

Meter #8 2” Incoming City Water - Irrigation

Meter #9 2” Incoming City Water - Irrigation

Discharge Locations

There are seven (8) discharge points. They are designated as follows:

Description Destination Metered Area

Point A Sanitary Sewer No Bldg. 60 Basement

Point B Sanitary Sewer Yes Bldg. 60 Basement

Point C Sanitary Sewer Yes By Building 40

Point I Sanitary Sewer No Building 73

Point G Sanitary Sewer No Building 30

Unnamed 1 Sanitary Sewer No Restrooms in Bldg. 96

Unnamed 2 Sanitary Sewer Yes Tower Blowdown

Point WWT Sanitary Sewer Yes WWT Plant (Pt. B)

Water Usage History

The following graph depicts the increasing volumes of incoming water and discharge water since 2005

Water & Sewer Cost Calculator

CITY WATER & SEWER COST CALCULATOREnter City Water Volume 92,992,000 Gallons    

Enter City Sewer Volume 80,552,000 Gallons      

City Water Volume (Gallons)City Water Rate (per

1,000 Gallons)City Sewer Rate (per

1,000 gallons) City Water Charge City Sewer ChargeUp to 10,000 $1.61 $6.67 $16.10 $66.70

10,000 to 50,000 $1.34 $5.97 $53.60 $238.8050,000 to 300,000 $1.11 $4.77 $277.50 $1,192.50

300,000 to 1,000,000 $1.03 $3.63 $721.00 $2,541.00

Over 1,000,000 $0.88 $2.81 $80,952.96 $258,497.52

TOTAL $82,021.16 $262,536.52

Date City Water Cost City Sewer Cost TOTAL2005 $20,771.40 $66,954.90 $87,726.30

2006 $37,555.64 $120,550.03 $158,105.672007 $51,798.44 $166,029.88 $217,828.322008 $84,906.68 $271,750.51 $356,657.192009 $82,021.16 $262,536.52 $344,557.68

5-Year Total $277,053 $887,822 $1,164,875

Water & Sewer Cost History

Water Usage Estimate

1. Interviewed Department Heads

2. Traced Water and Discharge Piping Lines.

3. Recorded and Verified Existing Meter Readings

4. Reviewed Historical Meter Readings.

5. Monitored and Verified Flow Rates with Portable Ultrasonic Flow Meter.

HDM Usage Worksheet

Water User Qty System Volume (gals)

Frequency of Operation

Type of Water Meter #

Water Usage per UnitANNUAL

TOTALGallons per Operation

Gallons per Day

Gallons per Week

Gallons per Month

Gallons per Year

Central Cooling - Head line 1 70,000 Ongoing RO/City 1&5 - 2,500 17,500 76,050 910,000 910,000

Central Cooling - Block line 1 70,000 Ongoing RO/City 1&5 - 2,500 17,500 76,050 910,000 910,000

Parts Washer - Makeup 4 - Ongoing RO/City 1&5 - 25 175 761 9,100 36,400

Parts Washer - Washdown & Refill 4 3,000 4 Weeks City 1&5 4,000 142 1,000 4,333 52,000 208,000

Mobile Parts Washer - Makeup 4 - Ongoing RO/City 1&5 - 10 70 304 3,650 14,600

Mobile Washer - Washdown & Refill 4 300 2 Weeks City 1&5 400 29 201 869 10,428 41,712

Mazaks 7 211 6 Weeks City 1&5 0 0 0 0 0 0

Mist Eliminators: Mist Cycle 9 n/a 10 minutes every shift Soft 1&5 100 300 2,100 9,100 109,200 982,800

Mist Eliminators: Pre-Filter Washdown 9 n/a 10 minutes every shift Soft 1&5 50 150 1,050 4,550 54,600 491,400

Aqueous Parts Washer 1 150 Monthly City 1&5 200 7 46 200 2,400 2,400

Mop Basins and Utility Sinks 6 n/a Ongoing City 1&5 - 5 35 152 1,825 10,950

Solution SP-2238R / J-2347 1 500 6 Weeks City 1&5 600 14 100 435 5,214 5,214

Nalco Solution SCN9194CL 1 150 6 Weeks City 1&5 200 5 33 145 1,738 1,738

TOTAL 3,615,214

Note: Red text indicates variable used for calculating usage Annual Gals

HDM Usage Chart

LDD Usage Chart

HVAC Usage Chart

Wastewater Usage Chart

LDTC Usage Chart

Employee & Related Usage Chart

Departmental Usage Summary

2009 Departmental Usage Chart

DEPARTMENT Type of Water Meter # ANNUAL TOTAL

HDM City/Soft/RO 1&5 3,615,214

LDD City/Soft/RO 1&5 818,695

HVAC City/Soft/RO 1&5 80,963,548

WWT City Water 1&5 8,840

LDTC City/Soft 1&5 53,067

SYTECH City 1&5 28,522

EMPLOYEES City/Soft 1&5 5,000,000

90,487,886Annual Gallons

Where Is The Water Coming From?

METER #2009 VOLUME

(Gallons)

Meter 1 34,220,000

Meter 3 2,270,000

Meter 4 230,000

Meter 5 10,860,000

Meter 6 43,610,000

Meter 7 1,280,000

Meter 8 522,000

Meter 9 0

TOTAL 92,992,000

Where Is The Water Going?

2009 Water Balance

2009 PURCHASED v. USAGE BALANCE

ITEM   QTY. Units

2009 Purchase Volume 92,992,000 gallons

2009 Projected Usage 90,487,886 gallons

Max. Margin of Error (+/-) 2%  

Max. Discrepancy 1,859,840 gallons

Discrepancy   -2,504,114 gallons

% Discrepancy 2.69% 

2009 Balance Summary v. Purchased

Item Qty. Disc

Purchased 92,992,000 -

Estimated Usage 90,487,886 2.7%

Discharged 93,760,898 0.8%

Maintaining Water Balance-

There Is Significant Value In Ongoing Monitoring of Purchased Water Volume, Internal Usage and Discharge Water Volume.

Meter Data Can Be Integrated Into The Building Management System

A Comprehensive Plan For Meter Locations, Data Acquisition and Analysis Can Be Implemented by Danco/GWS.

Potential Water Conservation and Cost Reduction Projects

# DescriptionAnnual

Reduction Annual Savings

1 Reclaim Cooling Water from Blowdown HX in Boiler Room 655,200 $2,417.69

2 Reclaim Portion of RO Reject Water (50%) 6,480,000 $23,911.20

3Reclaim Cooling Water from Air Compressors in Bldg.12 & Bldg. 73

30,000,000 $110,700.00

4Reclaim Water from Mist Eliminators in HDM (Return to Cooling System)

1,000,000 $3,690.00

5 Reclaim Fire Main Test Water 500,000 $1,845.00

6 Adjust RO Flow Rates to 75% Conversion 876,000 $3,232.44

7 Use RO Water in Combination w/ City Water for Tower Makeup 3,000,000 $10,930.00

8 Use RO Makeup Water to Boilers 6,000,000 $78,117.60

9 Install VFD on RO Pump 68,841 $4,130.43

10 Install VFD on RO Water Distribution Pumps 28,684 $1,721.01

TOTAL $240,695.38

Operational Improvements -

Resolve issues with RO Pretreatment – Softeners and Carbon Filters

Improve RO System Operation

Segregate Soft Water System from RO

Reclaim Regeneration Water From Water Softener and Carbon Filters

More Operational Improvements

Additional RO Water Available for HDM

Heat RO Feedwater

Add Controls to Cooling Water Processes (Air Compressors)

Modify Water Main Configuration to Improve Flow & Pressure.

Questions and Answers