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halgan pty ltd
DESIGN MANUFACTURE SERVICESUSTAINABLE ENVIRONMENTAL TREATMENT SOLUTIONS
Surge Control DeviceSCD
[email protected] 1800 626 753 www.halgan.com.au
When the aim is clean trade waste retrofitting SCDs should be part of any trade waste management
• Universally adaptable • Increases efficiency by up to 95%
• Cost effective solution • Low install costs
• Rapid cost recovery • Nationally tested
• Patented by Halgan
The SCD is a series of polyethylene plates fitted at the grease arrestor outlet as a standard part of
Halgan’s Modular Grease Trap design, but is also retro-fitted to all grease arrestors irrespective of design or material to
improve performance. The cost of compliance is reduced by using a cost effect SCD device rather than requiring existing
customers install larger system. In concrete, fiberglass or stainless tanks, and from boat shape to triple interceptors, the
performance improves up to 95%.
How does it work?
The SCD unit is installed inside existing or new pre-treatment vessels. The SCD unit is located internally connected to
the outlet pipe. The SCD unit is submerged in the pre-treatment vessel chamber, usually half way from the bottom of
the vessel to the natural water level. The SCD is fixed and cannot be removed. The SCD by virtue of its hydraulic back
pressure design principle addresses the fundamental engineering basic of a batch process.
Typically the design on available waste water treatment
devices assumes a continuous process principle. It
is therefore a device whereby the treatment process
accommodates the typical surge nature of the influent
flow that characterise most modern waste water flows.
Surges are smoothed out in the chamber and pollutant
concentrates partially balanced. Surges of flow rates
and variable pollutant concentration are the major
causes of waste water treatment systems inefficiency -
the SCD combats this.
The SCD unit comprises of multiple packed plates. The number of plates can be increased to accommodate higher flow
rates. The SCD has a special feature of a flow-restricting device within the SCD unit and the outlet end. The restricting
device balances the pressure within the SCD unit and external environment. The effluent then is discharged through the
outlet pipe into disposal system or reticulated sewer system. The drawing effect through the SCD unit encourages laminar
flow. The laminar flow is ideal flow for particle separation.
The SCD unit will also cause a slight backpressure within the chamber. This backpressure will help the heavy particles
to settle and the lighter particles to rise to the surface. The backpressure will also stabilise surges within the chamber.
The particle plates will trap and deflect the suspended particles, which will escape through the gap back into the pre-
treatment vessel chamber. When the hydraulic surge stopes, the buoyant particles float to the surface and heavy particles
drop to the bottom of the vessel, this is due to the SCD unit is submerged inside the pre-treatment vessel.
Sizing requirements and applicability for SCD retro fit to existing grease arrestors
The SCD is recommended to up grade grease arrestor performance to help comply with the local discharge requirements. The
larger the volume of the grease arrestor, the more plates are added, up to a 10,000 litre SCD. The selection of the correct SCD
retro fit model is based on the nature and quantity of wastewater to be treated taking into account:
• Maximum flow rate of wastewater • Maximum temperature of the wastewater
• Density of grease/oils to be separated • Influence of cleansing and rinsing agents.
• Grease storage capacity • Solids storage capacity
• Separation zone.
Installation procedures
Ensure the SCD being installed is the correctly sized for the application. When carrying out the installation adhere to the
current Occupational Work Health and Safety requirements and building codes.
Step 1. Pump out grease arrestor as per the local water
authority’s requirements.
Step 2. The SCD (B) is installed inside the grease arrestor,
at the outlet end. Clean grease arrestor connection
point inside grease arrestor. Using solvent cement,
glue bend (A) to the grease arrestor connection point.
The SCD (B) has to be horizontal and 90 degrees
to the outlet connection wall.
Step 3. Measure and cut to the length of the servicing pipe
(D). This is done by locating the access cap (F) above
the water level near the grease arrestor access lid.
Step 4. Install servicing pipe and install support bracket (E).
Step 5. Fill grease arrestor with potable water to its working level.
Cleaning and Maintenance
SCDs are designed to be self cleaning as material does not stick to polyethylene, and any excessive soft particles can be
removed by normal water pressure.
The SCD can also be cleaned by inserting a hose down the inspection opening or the internal service pipe. The vacuum line
can be inserted down the IO servicing pipe before pumping out the grease arrestor. This will clean the inside of the SCD.
As the SCD is fixed below the water level, the unit cannot be tampered with.
DESIGN MANUFACTURE SERVICESUSTAINABLE ENVIRONMENTAL TREATMENT SOLUTIONS
halgan pty ltd
[email protected] 1800 626 753 www.halgan.com.au
Sydney 22 Ethel Avenue, Brookvale, NSW 2100
ph. +61 2 9939 8030fax. +61 2 9939 8027
Brisbane 141 Magnesium Drive, Crestmead, QLD 4132
ph. +61 7 3208 8339fax. +61 7 3803 6547
Sales | [email protected] General Enquiries | [email protected]
