PolyGeyser® Technology and Silica Solids Removal

AST Background

Industry leader in the design and manufacturing of bead filtration technology

Founded in 1993 Technology proven effective at

solids removal with decades of application in aquaculture and are actively pursuing other applications outside of aquaculture

Technology Overview

Originally developed as an efficient alternative to sand filters Low energy consumption Low maintenance minimal water loss

Polyethylene bead media forms a static filter bed at the top of the units

Functions as both a mechanical and biological filter

Periodic fluidization of media to remove captured solids

Uses: TSS reduction BOD reduction Nitrification Can be paired with pretreatment

to capture precipitated solids

Lines: Propeller Bead Filter Bubble Bead Filter PolyGeyser

PolyGeyser® The PolyGeyser® is the newest of the three lines

offered by AST. Features include: Automatic air-driven back flush No moving parts Internal solids concentration and storage basin

The unit is made up of three connected internal chambers: the filter chamber; the charge chamber; and the sludge chamber

The filter was designed to minimize head loss so that it can be run in an airlift configuration

The backflush is pneumatic and occurs independently of solids elimination from the filter because are concentrated prior to evacuation

PolyGeyser®: The Chambers Filter Chamber – Section “C” in figure

The filter contains the Low-Density Polyethylene beads that clarify influent water

Solids removal of 100% down to 50 microns 50% single pass removal of solids 5-50 microns The filter has two inlets and two outlets to distribute the

flow evenly through the bead bed Low headloss through filter media allows for smaller

pump sizing for same flow rate Automatic air-driven back flush allows for high frequency

back washing with no added labor or water loss. This enables the unit to treat heavy solids loads.

PolyGeyser®: The Chambers Charge Chamber- Backflush mechanism

Air is slowly fed through air inlet “E” to an internal charge chamber “D” where it displaces water and accumulates. When a set volume of air is reached the trigger mechanism “F” rapidly releases the air into bead chamber “C”.

Backflush frequency is controlled by the rate air is fed to the unit. The higher the air feed rate the higher the backflush frequency

Eliminates the need for constant oversight of filter by the operators No water loss

Point E on the drawing is the air inlet Point D is the Charge Chamber

PolyGeyser®: The Chambers Sludge Chamber

Since the backflush is pneumatically operated, the filter recycles backwash water to remove the solids from the filter chamber.

The water acts as the vehicle to carry solids to the sludge chamber Solids settle allowing the water to be used to carry solids from the

next back flush The drop Chute, G, directs the captured solids to the sludge

chamber where it is concentrated Waste removed from the filter can contain up to 2-4% solids Only water removed from the unit is in the concentrated waste

stream

Many Different Forms and Sizes: Same functionality

Other Applications of the Technology Concentrating algae prior to

centrifuge Capture algae in the bead bed

and lower upfront capital and long term energy costs of a larger centrifuge unit

Minimize water and algae mix heading to centrifuge

Particulate iron removal Bio-remediation of human

hormones BOD and TSS reduction in food

digestion treatment train

AST would like to sincerely thank you for your interest. We are available for an onsite meeting to discuss the application in greater detail. We are also willing to assist with pilot testing.

Further Questions or Concerns

Emile McCormick Cell – 504-256-2690 Office – 504-837-5575 Email: Michael.Malone@astfilters.com