Alarm over ‘alum sludge’ from water treatment plant

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The brown sludge covering the surface of the river. The PBAPP says it is not hazardous but environmentalists do not agree.GEORGE TOWN: Three rivers in Seberang Perai have been covered in what looks like thick brown mud, and a green group here has raised the alarm over potential heavy metal pollution there. They believe the “sludge” is a by-product of a major water treatment plant which supplies water to 80% of Penang.The Penang Water Supply Corporation (PBAPP) which runs the plant was swift to deny the claim, but the Penang sustainable natural heritage association (LEKAS) is standing its ground, saying the pollution has to be investigated.PBAPP said the brown sludge was essentially residual aluminium resulting from one of their treatment plants and was not hazardous to health and the aquatic environment. It said if it was indeed dangerous, then these rivers would be depleted o…