The Sungai Semenyih Water Supply Scheme implemented by the Selangor State Government supplies clean water to South-West of Kuala Lumpur, Petaling Jaya, Shah Alam, Klang, Putrajaya, Cyberjaya, Sepang, Puchong, Seri Kembangan, Bandar Baru Bangi, Kuala Langat and the surrounding areas.
In the year 2001, Konsortium ABASS Sdn Bhd was awarded a 30 years concession to operate and maintain the Sungai Semenyih Scheme.
Breaking the traditional norm of sludge disposal for water treatment plants in Malaysia, ABASS has constructed a modern sludge treatment facility at the Sungai Semenyih Water Treatment Plant, with the objective of protecting the environment under the Environmental Quality (Sewage and Industrial Effluents) Regulations.
With a capacity of 600 metric tones per day (at 35% dry solid), the Sungai Semenyih sludge treatment facility is the biggest sludge treatment in Malaysia for water treatment process. The sludge produced from the water treatment process is dewatered mechanically using six units of centrifuge decanters. The sludge treatment facility is employing the “zero discharge” concept, where all the liquids recovered from the various stages will be recycled back into the water treatment plant.