vacuum sewers for coastal areas

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Vacuum Sewers – A Viable Alternative for Coastal Areas Soma Bhadra, PE www.consult-proteus.com Denny Moss www.airvac.com Conference on Coastal Engineering Practice 2011 San Diego, CA Monday August 22, 2011

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What are vacuum sewers and how do we install such a system in coastal areas

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Page 1: Vacuum Sewers For Coastal Areas

Vacuum Sewers – A Viable Alternative for Coastal Areas

Soma Bhadra, PE www.consult-proteus.com

Denny Moss www.airvac.com

Conference on Coastal Engineering Practice 2011 San Diego, CA

Monday August 22, 2011

Page 2: Vacuum Sewers For Coastal Areas

Why Vacuum Sewers?

Uses Differential Air Pressure

to Move Wastewater

When Gravity

Sewers have Constraints

Environmentally Sensitive Areas

Tight Working Areas

High Groundwater

Rock

Flat Rolling Terrain

Unstable Soil

Page 3: Vacuum Sewers For Coastal Areas

Vacuum Sewers

• Small pipe sizes (4 to 10-inches)

• No manholes and cleanouts

• Shallow depths (3 – 5 feet)

• High Scouring velocities (8 – 18 fps)

• No exposure to sewer gas

• No I/I, Exfiltration prevented

Benefits

• Reduces costs

• Lines stay clean

• Reduce environmental impact

• Very low odor problems

• Leaks cannot go un-noticed

• Safe

Page 4: Vacuum Sewers For Coastal Areas

4

Home Valve Pit Vacuum Sewer

Vacuum Station

Force main

How Vacuum Sewer Works

Page 5: Vacuum Sewers For Coastal Areas

Home to Valve Pit

Page 6: Vacuum Sewers For Coastal Areas

Air Intake

Page 7: Vacuum Sewers For Coastal Areas

• Pit /Sump & Cone

• Vacuum Valve

• Sump Breather Unit

• Anti-flotation Collar

The Valve Pit

Page 8: Vacuum Sewers For Coastal Areas

Vacuum System Layout

Page 9: Vacuum Sewers For Coastal Areas

Design Guide

D Design Max Design Max (in) (gpm) (gpm) (# homes) (# homes) 4 40 55 60 85 6 105 150 165 235 8 210 305 330 470

10 375 545 585 850

Pit Type Peak (gpm) Maximum Peak (gpm)

Standard 0.5 - 1.5 3

Single Buffer

3.1 - 15 30

Dual Buffer 15 - 30 60

Page 10: Vacuum Sewers For Coastal Areas

Oak Island, North Carolina

81+miles of vacuum sewers

9 vacuum stations

4,500gpm pump station

10+ miles wastewater + reuse force main

400,000 gpd MBR WWTP

Page 11: Vacuum Sewers For Coastal Areas

Service Areas and Vacuum Stations

9 Service areas, 1 Vacuum Station in each, 1 central Pump Station

Failing Septic System

Beach properties,

vacation rentals

Very flat High groundwater

Intracoastal Waterway

Hurricane prone

Wetlands + Environmenta

lly sensitive

Page 12: Vacuum Sewers For Coastal Areas

12

Home Valve Pit Vacuum Sewer

Vacuum Station

Force main

How Vacuum Sewer Works

Page 13: Vacuum Sewers For Coastal Areas

Collection System Design

SDR 21, Schedule 40 PVC fittings

O-Ring, Rieber gasket

20 – 500 ft. at 0.2% Slope with 1 to 1.5ft lifts

18’ total available lift at 16” Hg, 5’ used to evacuate the sump’ 13’ available for sewage transport

Page 14: Vacuum Sewers For Coastal Areas

Collection System

Page 15: Vacuum Sewers For Coastal Areas

Vacuum Station

Incoming Vacuum Mains

Vacuum Pumps Collection Tank Sewage Pumps

Force Main

Standby Generator

Odor Control

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Vacuum Sewers – A Viable Alternative for Coastal Areas

Acknowledgement: Town of Oak Island, North Carolina Black & Veatch, Cary, NC

Soma Bhadra, PE (858) 353-2805 [email protected] www.consult-proteus.com Denny Moss (800) 247-8229, ext. 229 [email protected] www.airvac.com