Wastewater Reuse

Expansion in Austin

Ryan Grosskopf

2009

• 5.2 MGD• Avg potable

water production of 142 MGD

• Summer residential landscape use: ~25%

2034

• 15 MGD• Avg water

production ???

Primary Uses

• Cooling water• Golf courses• Landscape

irrigation

Austin Wastewater Reuse

Centralized Austin Reuse

Problem?

Possible Solution: MBRs and

Decentralized Reuse

http://www.eflo.com/pdfs/eflo-mbr.pdf250 m3/day or about 66,000 gpd

Small Footprint

Low maintenance

Sewer mining

$7-20 / gallon capacity

Where?Determine Treatment Plant

and Use LocationsCity of Austin• 2008 Land Use

Dataset• 2010 Wastewater

and Reuse Network DataUSGS

• 1/3’ DEM

Current Infrastructure Limitations: 51st Street

Tower

http://www.austinchronicle.com/

Which Neighborhood for Service?

Land Use

Irrigated Area

Single Family 40%Duplexes 30%Apartment/Condo 0%Commercial 0%Office 0%Government Services 0%Educational 20%Meeting and Assembly 0%Cemetaries 75%Parks/Greenbelts 20%Undeveloped 0%

• 2009 annual average:.042 inches/day

Accuwater Evapotranspiratio

n Index

• .025-.300 MGDPackage MBR plant capacity

• ~70 feet of head required for irrigation sprinklers

Elevation

Evaluation by hand…. TEDIOUS!

Single Family

Duplexes

Educational

Cemetaries

Parks/Greenbelts

Non-Irrigated

Total Area:640 Acres or 2.6 km2

Total Esti-mated Irriga-tion Volume:.31 MGD or 1173 m3/d

Selected Neighborhood Land Use by Area:

~95% of property area likely has some

irrigation

Plant LocationDistance from > 24”

wastewater mainElevation gain from

neighborhoodProperty type and

size

Jackpot!