OVERVIEW
1. Purpose2. Description3. Comparison of GPT’s 4. CDS Operation5. Treatment
Performance6. Application7. Maintenance
PURPOSE
• The CDS technology is ideally suited to the removal of physical pollutants from stormwater
• Targeting the removal of gross solids and sediment
• Effective over a wide range of treatment flows
• No clogging / Blinding
• Low life cycle costs
DESCRIPTION
Continuous Deflective Separation
– Non blinding/clogging screen technology
– High rate physical separation, screen and vortex separation
– Guaranteed treatment flow rate
DESCRIPTION
– Separate treatment and storage zones,
– Pollutants stored out of flow path, reduced re-suspension
– Benefits of Direct Screening and Vortex Separation
Continuous Deflective Separation
Direct Screening Vs CDS
Q (Outflow)
CDSContinuous Predictable Flow - Non Blocking ScreenNo Bypass Flow occurs up to 100% capacityIdeal for continuous stormwater treatment models (e.g. MUSIC)
Reducing & Unpredictable Flows - Blocking ScreensResidual Flow (red) bypasses screening area
Q (Inflow)
Q (Inflow)
Q (Outflow)
Bypass
Direct Screen
COMPARISON OF GPT’S
CDS OPERATION
CDS Model Identification
– 4.7mm Aperture Screen Standard
– Steel components manufacture from 316 SS
– Precast is 50 MPa concrete
Most extensive independently validated GPT on the market
– CRC for Catchment Hydrology
– CSIRO
– Portland State University
– Louisiana State University
– UCLA
– New Jersey Corporation for
Advanced Technology (NJCAT)
TREATMENT PERFORMANCE
CDS Unit GPT
• Internationally patented technology
• Large customer base through out the UK, US, Asia and Australia
• Used for solid liquid separation in water, wastewater and stormwater treatment industries
TREATMENT PERFORMANCE
Gross Solids Separator, Wastewater Reuse System
Melbourne
CDS Unit GPT
TREATMENT PERFORMANCE
– Non-blocking screen / Guaranteed Treatable flow rate / High removal efficiency
– 98% reduction in Gross Pollutants
– 70% reduction in Total Suspended Solids
– 30% reduction in Total Phosphorus
– Up to 80% reduction in Heavy Metals
– Up to 94% of Hydrocarbons, Oils and Grease
Benefits of the CDS Unit GPT
APPLICATION
• Stormwater Treatment
• Stormwater Harvesting
• Combined Sewer Overflow
• Sewer Mining
• Liquid Solid Separation
APPLICATION
Fully Customisable
Inlet angle, tail-water, oil baffles, dual outlets, penstocks/drop boards, back to back units, exclusions bars, etc.
APPLICATION
Rocla offers a product specific design service giving customers detailed information including:
Product Application Design
• Product design and sizing advice
• Site specific design drawings, incorporating associated adjacent infrastructure & services
• Hydraulic analysis on the contributing drainage system, HGL, weir heights, etc.
APPLICATION
Rocla offers a product specific design service giving customers detailed information including:
Product Application Design
• Hydrological analysis of sites for rainwater/ stormwater harvesting applications
• Quantity and Quality treatment analysis
• Proven design outcomes for even the most difficult sites.
MAINTENANCE
Easy and Efficient Maintenance– Large openings allow good access and
ventilation
– Large standard storage volume which can be increase if required
– No moving parts to grease or maintain
– Screen does not need to be cleaned due to CDS technology
– Low flow bypass and isolation device are available