How does belt press dewatering turn alum sludge into resources?

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Belt Press Dewatering Transforms Alum Sludge into Construction Material Resources

The belt press dewatering technology plays a crucial role in converting water treatment residue into a valuable resource by efficiently separating water from solids. This process, implemented at the Sungai Dua Dewatering Plant (SDDP), allows for the recovery of water which is then reintegrated into the Penang Water Supply Corporation's (PBAPP) potable water system. The remaining concentrated alum sludge is subsequently processed further to create construction materials.
Water Recovery and Sludge Concentration

At the Sungai Dua Dewatering Plant (SDDP), the belt press dewatering technology is employed to extract water from the residue generated during water treatment. This dewatering process achieves a significant recovery of water, estimated at approximately nine million litres daily, which is sufficient to supply between 10,000 and 12,000 households. The result of this dewatering is a concentrated alum sludge that is then transported to Alam Aliran Kualiti (M) Sdn Bhd (AAK)'s facility for further processing.
Chemical Treatment for Aggregate Production

Upon arrival at AAK's brick manufacturing facility, the alum sludge undergoes a chemical treatment process. This treatment is specifically designed to transform the sludge into aggregates, which are essentially granular materials used in construction. The development of this process involved nearly five years of research and development, including extensive technical evaluations and obtaining regulatory approvals, particularly as the residue is classified as scheduled waste (SW204) under the Environmental Quality Act 1974.
Proprietary Formulation for Cement Bricks

The aggregates produced from the chemically treated alum sludge serve as the primary raw material for manufacturing cement bricks. This manufacturing process utilises conventional production methods but incorporates a proprietary formulation developed by AAK. This unique formulation is essential for ensuring that the resulting cement bricks meet established industry quality standards.
Enhanced Properties and Commercialisation

The cement bricks produced through this innovative method exhibit properties that enhance their performance compared to conventional bricks. Notably, tests have indicated that these bricks possess superior fire resistance. The facility has the capacity to produce up to 150,000 bricks daily, with current production ranging between 70,000 and 100,000 bricks. These bricks have already been commercialised and are being utilised in construction projects and sold through hardware stores across Penang. The product has achieved ISO 9001 certification and is undergoing further certification by bodies like Sirim and the Fire and Rescue Department of Malaysia.

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How does belt press dewatering turn alum sludge into resources?

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