What steps were taken to mitigate the odour pollution in the river?

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Mitigation Efforts for Odour Pollution in Sungai Selangor

The Lembaga Urus Air Selangor (LUAS) implemented several measures to address the odour pollution detected in Sungai Selangor. These actions were taken following the identification of a foul smell, similar to that of dead fish, impacting the raw water supply.
Release of HORAS Water to Dilute Odour

To counteract the detected odour pollution, the Hybrid Off River Augmentation System (HORAS) water was released into Sungai Selangor. This intervention aimed to dilute the concentration of the odorous substance, thereby reducing its intensity in the raw water source.
Monitoring and Sampling of Pollutant Parameters

LUAS, in conjunction with the Hulu Selangor District Council and Pengurusan Air Selangor Sdn Bhd, conducted monitoring to identify the source of the pollution. This monitoring led to the discovery that water from one of the 57 fishponds was discharged into the river for pond-drying purposes. Furthermore, LUAS has performed six separate samplings at the affected location to measure key parameters, including ammoniacal nitrogen (AN), total nitrogen (TN), and total phosphorous (TP).
Identification of the Pollution Source

The investigation revealed that the odour pollution originated from an aquaculture pond. Specifically, water discharged from an illegal catfish pond was identified as the cause. This 45-hectare aquaculture farm is situated approximately 8.7 kilometers from the Rantau Panjang Water Treatment Plant (LRA).

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What steps were taken to mitigate the odour pollution in the river?

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