BioWeb and Webitat Fixed Media IFAS Systems

Sarah Hubbell Director of Technology, Entex Technologies Inc.

History of BioWeb

R&D

Design Approach

Description of Equipment

Sneak Preview

Got Biomass?

Moving Media “MBBR” Media

Floating Media

Carrier Elements

Media Options

Fixed Media Rope Type Media

Rigid PVC Media

BioWeb or Webitat

Fixed vs. Moving media When to use which ?

Fixed Media Moving Media

Lowest capital cost criticalNew pretreatment basins –

need to minimize new basin size

Power cost significant criteria Stretching limits of basin capacity even with IFAS

Flood zone or other high risk of media washouts

Extremes of loading, temperature, etc.

Existing plant close to new standards, but not quite capable

Treatment of high strength waste in small volumes

Advantages Simple installation—

quick and inexpensive

Simple expansion with addition of modules

Can use fine bubble diffusers, existing systems

Fixed MediaAdvantages and Disadvantages

Disadvantages Predation by redworms

may require DO control

Kinetics not as high as moving media systems

Fine screens or primaries are required

Simple Installation

Save space and costs by augmenting existing basins with IFAS media.

Reuse Fine Bubble Diffusers

Fixed Media Options

Rigid Medias:• Trickling Filter

• Tubular Bundles

Dynamic Medias:• Rope Type

• Hexagonal Matrix

• Fabric Sheet Matrix

Ringlace

Development of BioWeb

BioWeb - New York City - 1996• Tallman Island, NY

• 80 mgd WWTP• Ringlace• Chinese Lanterns• PVC Sheet Media

Continued R & D

Design Options

Modeling/Simulation Software

Published kinetic rates

Pilot Studies

Models

Aquifas www.aquifas.com

BioWin www.envirosim.com

GPS-X www.hydromantis.com

Pro2D (exclusive to CH2M Hill)

Webitat Diffusers

Lift showing air scour / DO control for redworms

WebitatBioFilm and Predator Control

3rd generation fixed media system

Sensor(optional)

Side Shrouds(all 4 vertical sides) BioWeb Media

(Partial BioWeb shown)

Controlled airlift mixing from under Webitat modulevertically through module then out of the top

Webitat for Lagoons

BioWeb Installations Tallman Island WWTP, New York City North Buffalo WWTP, Greensboro, NC Environmental Center for Livestock Waste Management (ECLWM), Taiwan Windsor Locks WPCF, Windsor Locks, CT Mamaroneck, NY Ashfield, MA Alimente Breton Foods, Siegas, New Brunswick, Canada Donner Summit PUD, Soda Springs, CA Harbor Road WWTP, Green Cove Springs, FL Port Austin, MI Stewart Creek WWTP, The Colony, TX Kenosha Beef, WI Newark, NY Coeur D’Alene, ID Stafford Springs, CT Johnstown, PA

BioWeb InstallationsWindsor Locks—2001

1.43 MGD Design Flow — BioWeb installed in both trains, following side by side demonstration

BioWeb InstallationsThe Colony, TX—2005

Modules installed in the annular ring in one of two circular tanks

Two of a total of 24 modules placed in tank over fine bubble diffusers

BioPortz

Without Biomass

With Biomass

Plastic—HDPE

Summary

IFAS is an economical upgrade option

Moving and Fixed Media both good options

Aeration design must be carefully considered

Models are available for sizing

Any Questions?ENTEX Technologies Inc. 400 Silver Cedar Court, Suite 260Chapel Hill, NC 27514919.933.2770 Sarah.Hubbell@entexinc.com www.entexinc.com