FLOW EQUALIZATION & METER DOSING

1. FLOW EQUALIZATION & METER DOSING Ron Suchecki Hoot Systems, LLC Lake Charles, LA

2. Loading of ATU’s • Equalization is a benefit to all systems. • NSF Standard 40 • 35% - 6:00 am to 9:00 am • 25% - 11:00 am to 2:00 pm • 40% - 5:00 pm to 8:00 pm 9 hours x 60 = 540 minutes or 0.92 GPM

3. Life Style Changes • Loading Rates 1970’s • 50% Am • 50% 3:00 – 11:00 • 90% - 1 hr.

4. 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)

6. 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

7. Traditional Hot Water Heaters

8. Tankless Water Heaters

9. Just Water our Industry needs… • Just

10. Garden Tubs

11. Garden Tubs

12. Multiple Shower Heads

15. Washing Machines/Laundry

16. Washing Machines/Laundry

17. Chapter 285 - Historically • Our State Charts (Prior to 2012) at 60 @ GPB were some of the lowest in the country • The State criteria is a MINIMUM criteria, not the only criteria

18. ATU – Design

20. TOWTRC – Equalization Study • Your “Research Council” Fee’s used to Fund a Baylor Study Dr. Yelderman/Amy Price • 4 Systems – 500 GPD Aerobic Units • 480 Standard 40 – 0.92 GPM • 480 Equalization – 0.33 GPM • 600 Equalization – 0.42 GPM • 720 Equalization – 0.5 GPM

22. Chapter 285 – Tank Sizing •   (1) Tank sizing. Proprietary treatment systems that serve single family residences, combined flows from single family residences, or multi-unit residential developments shall be designed using Table II in §285.91(2) of this title unless there is an equalization tank preceding the aerobic treatment unit. If there is an equalization tank preceding the aerobic treatment unit, the equalization tank shall meet the requirements set forth in §285.34(b)(4) of this title (relating to Other Requirements) and the aerobic treatment units can be sized using the wastewater flows in Table III in §285.91(3) of this title. Proprietary Treatment systems for non-residential facilities shall be sized using the wastewater flows in Table III in §285.91(3) of this title. Leak testing shall be performed in accordance with subsection (b)(1)(H) of this section.

23. Chapter 285 – Tank Sizing •   (1) Tank sizing. Proprietary treatment systems that serve single family residences, combined flows from single family residences, or multi-unit residential developments shall be designed using Table II in §285.91(2) of this title unless there is an equalization tank preceding the aerobic treatment unit. If there is an equalization tank preceding the aerobic treatment unit, the equalization tank shall meet the requirements set forth in §285.34(b)(4) of this title (relating to Other Requirements) and the aerobic treatment units can be sized using the wastewater flows in Table III in §285.91(3) of this title.Proprietary Treatment systems for non-residential facilities shall be sized using the wastewater flows in Table III in §285.91(3) of this title. Leak testing shall be performed in accordance with subsection (b)(1)(H) of this section.

24. Chapter 285 Rules on EQ Tanks • (4) Equalization tanks. In addition to the requirements for pump tanks in this section, equalization tanks shall meet the following criteria: •     (A) The equalization tank must be preceded by a pretreatment tank. •     (B) If an equalization tank is serving residences, the tank shall have a volume between the pump intake level and the high water level of at least 50% of the design flow and be designed to time dose at equal intervals and equal doses throughout a 24-hour period. The tank may contain a gravity line located above the high water alarm level which allows flow to the aerobic treatment unit. The design will use no fewer than 12 doses throughout the 24-hour period. •     (C) If an equalization tank is designed to equalize flows over periods longer than a 24-hour period, the tank shall be designed to time dose at equal intervals and equal doses over the flow equalization time period. The design shall have a storage between the highest wastewater flow line during the period and the high level alarm equal to at least 20% of the flow generated during peak days. The tank may contain a gravity line located above the high water alarm level which allows flow to the aerobic treatment unit.

26. City Sewerage • Municipal Systems are designed for a constant, consistent flow • For example a 24 MGPD System is designed for 1 MGPH • Average travel time, detention • Volume or Timed lift stations

27. Why is this important • Ensure proper detention time for: • Settling (Pre-treatment or Septic) • Exposure to Organisms for Breakdown • Clarification (Advanced Treatment) • Disinfection/Contact time (if required) • Even application to Drainfield – reduce surge events

28. Lesikar Slide

31. What Types Commercial of On-Site need Surge Tanks/Metered Dosing ?

32. COMMERCIAL • Airports, bus terminals, train stations, port & dock facilities, • Barber & beauty shops per service chair • Bowling alley bathroom waste • Country club/Golf Courses • Doctor and Dentist offices • Factories, exclusive of industrial wastes • Flea Markets • Food operations • Hotels & Motels • Mobile Home Park

33. COMMERCIAL Cont. • Office building • Transient Recreational Vehicle Park • Service stations • Shopping centers without food or laundry • Stadiums, race tracks, ball parks per seat • Stores per bath room • Swimming and bathing facilities, public • Theaters and Auditoriums, per seat • Veterinary Clinic • Warehouse

34. INSTITUTIONAL • Churches • Hospitals • Nursing, rest homes, adult congregate living • Parks, public picnic areas • Public institutions other than schools • Schools • Work/construction camps

35. Church Applications

36. Church Applications • Up to 100 % of weekly flow may occur in as little as 30 minutes (15 before and 15 after a service. • Many may offer multiple services, Sunday School, etc. so this flow may be broken down over a 3 to 5 hour period. • Lets look at the following design need.

37. Sunday AM Loading • 294 Seats in Sanctuary x2 services • 25 Choir • 25 Support Staff • 128 Children • Total Sunday AM Flow = 741 persons at • 3 Gallons per seat = 2223 Gallons Flow

38. Sunday PM • Sunday PM flow • 294 Sanctuary • 125 Child Care • 25 Support Staff 444 Seats @ 3 Gallons per Person = 1332 Gallons • Combined Sunday flow of 3555 gallons • Over a 6 hour day

39. Weekday Load • School – Day Care Facility • 125 Students @ 10 Gallons • 11 School Workers @ 15 Gallons • 14 Office Staff @ 15 Gallons • 1625 Gallons Daily Flow

40. Wed. Night • Max 200 including any childcare • 200 @ 3 GPP = 600 Gallons

41. Total Weekly Flow • Sunday AM = 2223 • Sunday PM = 1332 • School M-F = 8125 • Wed Night = 600 • Total Weekly Flow = 12,280 • Total Daily Flow = 1755 GPD

42. How to Dose • Ideally, Break down flow to an equal amount per minute – in our example, of 1754 Gallons of flow per day would be meter dosed at a rate of 1.2 GPM • With Meter Dosing systems are stable • No Greater than 10% of Daily flow in a 1 hour period is a good rule to follow.

43. How to distribute Sunday Flow • A 15 minute cycle give us 96 doses a day • Assume Sunday AM starts at 9:00, on a 15 minute cycle timer/set up we need to deliver 18 Gallons to keep up with a 1755 flow, • However we have 2000 Gallons of treatment capacity so we dose a little over 20 Gallons

44. Sunday Flow Distribution • If dosing starts at 9:00 AM, and the evening service Starts at 6:00 PM, then we are able to process 720 Gallons between the Start of the First Service and the beginning of the evening Service. • 2223 – 720 Gallons = 1503 Left • 1332 + 1503 = 2835 Gallons with No reserve above Alarm or Below Pump off Switch

45. TT/EQ Example

46. Any Questions