Save Water, Sewer, Chemical Costs with TWT Fluid Treatment

SAVE WATER, SEWER, AND CHEMICAL COSTS

GENERAL INDUSTRIAL BENEFITS



	Prevents Formation of Scale Etc.
	Chemical-Free Water Treatment
	Industrial Process Streams	The TWT Deposit Control System is an advanced method for controlling scale and bio-fouling in fluid systems. The Triangular Wave System performs many functions that lead to significant cost savings. For example: Deposit control means blowdown can be reduced, because concentrations of total dissolved solids in the water may be allowed to rise without concern for scale buildup. Deposit control means no chemical treatment is needed to keep equipment surfaces free of scale and biofilm. The costs and savings experiences at two SYSCO Food Distributions in Harrisburg, PA and Poway (near San Diego), CA are presented below. Each facility has a Total Water Control System to treat the cooling water. The return on investment of a Triangular Wave System can be extremely significant from operational, economic, and safety points-of-view.
	Deposit Control Benefits
	Corrosion Control
	Biofilm Control
	Save Water and Other Costs
	Energy Savings
	Softening Benefits

SYSTEM DESCRIPTION

SYSCO Distribution Facility, Harrisburg, PA
Evaporative condensers (2); Ammonia chillers (2); Baltimore Air Coil Evaporative Condensers -- 250 tons each

OPERATING CONDITIONS BEFORE TWT TREATMENT

24 hours per day -- 365 days per year -- 250 tons minimum; tower cleaning -- 2 to 3 times per year; tower monitoring and labor hours -- 6 hours per month; standard chemical treatment program; conductivity controller for blowdown set at "3"; incoming TDS -- 600 (average)

YEARLY OPERATING COSTS BEFORE TWT TREATMENT

Chemical treatment

Cleaning, monitoring, and labor costs

Water usage

Estimated water and sewer costs*

$10,000

$7,500

4,745,000 gal

$25,974

* SYSCO facility uses its own well, but use of city supplied water would provide above water and sewer costs.

Date TWT Total Water Control System (TWCS) Installed	May 1995
OPERATING CONDITIONS AFTER TWCS 24 hours per day -- 365 days per year -- 250 tons minimum; tower cleaning -- 1 time per year; tower monitoring and labor hours -- 1 hours per month; standard chemical treatment program; conductivity controller for blowdown set at "8"; incoming TDS -- 600 (average)
YEARLY OPERATING COSTS AFTER TWCS Chemical treatment Cleaning, monitoring, and labor costs Water usage Estimated water and sewer costs (City of Harrisburg costs)	$0 $2,500 3,650,000 gal $19,980
COST SAVINGS ANALYSIS Yearly chemical expense reduction Yearly labor expense reduction Yearly water/sewer expense reduction Total yearly expense reduction Return on Investment Payback 10 year life cycle savings	$10,000 $5,000 $5,993 $20,993 71% 16 months $209,930

SYSTEM DESCRIPTION

SYSCO San Diego Distribution Facility, Poway, CA
Evapco Evaporative Condenser -- 800 tons capacity

OPERATING CONDITIONS BEFORE TWT TREATMENT
12 hours per day -- 365 days per year -- 800 tons; tower cleaning -- 2 times per year; tower monitoring and labor hours -- 6 hours per month; standard chemical treatment program; conductivity controller for blowdown set at "3"; incoming TDS -- 600 (average)

YEARLY OPERATING COSTS BEFORE TWT TREATMENT

Chemical treatment

Cleaning, monitoring, and labor costs

Water usage

Estimated water and sewer costs (City of Poway --$1.71/ccf water and $2.15/ccf sewer)

$8,000

$5,000

9,466,800 gal (12,648 ccf)

$48,821

Date TWT Total Water Control System (TWCS) Installed

August 1998

OPERATING CONDITIONS AFTER TWCS
12 hours per day -- 365 days per year -- 800 tons minimum; tower cleaning -- not required to date; tower monitoring and labor hours -- 2 hours per month; standard chemical treatment program -- eliminated; blowdown at 1,200 gallons per day -- backwash sand filter; incoming TDS -- 600 (average)

CURRENT YEARLY OPERATING COSTS AFTER TWCS

Chemical treatment

Cleaning, monitoring, and labor costs

Water usage

Estimated water and sewer costs (City of Poway costs)

$1,650

6,745,200 gal 9,017 ccf

$34,808

COST SAVINGS ANALYSIS

Yearly chemical expense reduction

Yearly labor expense reduction

Yearly water/sewer expense reduction

Total yearly expense reduction

Return on Investment

Payback

10 year life cycle savings

$8,000

$3,350

$14,013

$25,363

100%

12 months

$304,356

SYSCO SAN DIEGO DISTRIBUTION FACILITY, POWAY, CA

WATER SAVING CALCULATIONS

Assumptions: Cooling tonnage -- 800 tons; yearly operating load -- 50%; concentration ration with chemical treatment -- 3

Water usage with standard chemical treatment program

E = evaporation in gal/yr = 3 gpm x tons / 100 x hrs/day x min/hr x day/yr

E (SYSCO San Diego) =3 x 800 /100 x 12 x 60 x 365 = 6,307,200 gal/yr

B = blowdown in gal/yr = E / (CR - 1); CR is concentration ratio

B (SYSCO San Diego) = 6,307,200 / (3-1) = 3,153,600 gal/yr

M = (make up water) = B + E

M (SYSCO San Diego) = 3,153,600 + 6,307,200 = 9,466,800 gal/yr

Water usage with Triangular Wave System installed

Evaporation remains the same = 6,307,200 gal/yr

B = blowdown in gal/yr = gal/backwash cycle x cycles/day x day/yr

B (SYSCO San Diego) = 300 gal/cycle x 4 cycles/day x 365 day/yr = 438,000 gal/yr

M = (make up water) = B + E

M (SYSCO San Diego) = 438,000 + 6,307,200 = 6,745,200 gal/yr

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