Gross Pollutant Traps (GPTs) remove litters, debris and coarse sediment from stormwater, these substances are collectively referred to as Gross Pollutants. Our CDS units however remove more than what GPTs’ could do by removing a high percentage of oil and grease, phosphorous and suspended solids. CDS is a Non-blinding technology, utilising vortex forces and high rate of physical separation of gross pollutants from the stormwater and remove almost 100% of all gross pollutants down to 1.0mm without having the screen being blocked, not even with fine plastics. CDS guarantees particulate capture whilst screen surface guarantees an unimpeded flow rate. Diversion chamber with fixed weir will form the off-line features which can be engineered to cope with any required flow rates. CDS requires no electrical power to operate and relatively low maintenance. The CDS units installed underground are unobtrusive in sights. The stored pollutants are not visible and are stored in a sump at the bottom of the screen chambers out of the flow path, thus assuring virtually no escape and re-suspension of the trapped gross pollutants..
CDS was developed by Professor Tony Wong who was a Malaysian in Monash University and was first used in the Olympic Park in Sydney in year 2000. It was proven very successful and reported in the paper that this technology recreated nature. Not only it stopped the gross pollutants into the adjacent river, it improved the water quality that the monitoring team has discovered the bio-diversity has improved before the development. The technology has also stopped the flash flooding which was due to gross pollutants mainly of fallen leaves which normally blocked the trash screen of bar screen type. The bar screen always blocked during the first flash of heavy down pours, unlike the CDS which worked on indirect non blocking principle which is self cleansing.
My former company McConnell Dowell group saw this opportunity and then negotiated and acquired a license for New Zealand. McConnell Dowell, being a construction company has not only used the technology in NZ to protect the nature waterways, they have re-designed the system to be built in multiple component of precast unit so that the construction is faster and cheaper.
In year 2001, the family of McConnell family who sold out the listed company McConnell Dowell whom I have worked for more than 10 years in Singapore and Malaysia to start EcoClean Technology Sdn Bhd in Malaysia.
The following year, Korea and Japan have also bought the CDS licenses for their respective countries. 2 years later, the license owner has listed their company in Australia and started to introduce the technology in Europe and USA.
CDS Technology today is proven to be the leading stormwater 3rd generation technology in the world in almost evert country.
We are using this technology in one of our KL River of Life sullage water treatment plant as well as our pilot high rise building aquaponics project in PJ.
Past projects which used CDS technology were Putrajaya, Nottingham University, Sungai Melaka, Medini development, Raffles American School, Sungai Gombak and etc. Nearly over 500 CDS units were installed all over Malaysia.