IF IT’S NOT A HOUSE, IT’S HIGH STRENGTHRon Suchecki

Hoot Systems, LLCLake Charles, LA

AWWARF - 1999

Domestic Water Use

Typical Domestic Sewage

• 200mg/L BOD/TSS (100-300)• 40-70mg/L Total Nitrogen• 1999 study, 75% of water use is NOT Toilet use

Progress In Water Savings

• Pre 1985 – Toilets were 5.0-7.0 GPF• 1985-1991 Standard was 3.5 GPF• 1991-1996 Standards were 3.5 to 1.6 GPF• 1996-Present Standard is 1.6

• Today there are new models that Range from single flush of 1.28 Gallons, and Dual Flush of less than a gallon & 0.5 GPF (#1)

Other Water Savings

• Washing Machines – Past • 30-40 Gallons per load

– Current – • HE Top Load - 23 Gallons• HE Front load - 15 Gallons

• Lavatory Faucets• Shower Heads

What Does This Mean ?

• Sewage Strength

• Water Consumption

• These Same Factors apply outside the home as well.

Commercial Structures

• Bathing 19 %• No Laundry 22%• Leaks 14%• Not from bathrooms 55% • Bathroom Now - (Toilets/Sinks) may account for up to

100% of use• Type of Building may increase strength– Food Prep– Food Waste– Self Serve

Ultra Flow Fixtures

• Water Conservation High Profile• Remodeling at Higher Rate than Residential• Waterless Urinals

How to Determine Flow & Strength

• Three Main Approaches to Design1. Existing Data (Flow & Strength Samples) – Best

How to Determine Flow & Strength

• Three Main Approaches to Design1. Existing Data (Flow & Strength Samples) – Best

Onsite Estimation Tables

• Three Main Approaches to Design1. Existing Data (Flow & Strength Samples) – Best2. Estimation from Like Properties• Size• Location• Community all become major factors

Onsite Estimation Tables

• Three Main Approaches to Design1. Existing Data (Flow & Strength Samples) – Best2. Estimation from Like Properties• Size• Location• Community all become major factors

3. State Tables or National Tables or Calculators

CIDWT Resources

Exit to CIDWT Form

BOD Loading Soda

• Soda – 75,000 mg/L BOD

• 75,000 BOD @32 oz. =

• Diluted into 2,000 gallons – 9.5 mg/L BOD

• Diluted into 500 gallons – 38 mg/L BOD

Any Questions