What caused the recent odour pollution in Sungai Semenyih and Sungai Langat?

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Odour Pollution in Sungai Semenyih and Sungai Langat Linked to Duck and Goose Farm Clean-up

The recent odour pollution affecting Sungai Semenyih and Sungai Langat is believed to have originated from a significant clean-up operation at a duck and goose farm located beside Sungai Pajam in Negri Sembilan. Investigations have determined that the pollution stems from organic substances, specifically animal carcasses, rather than petroleum-based contaminants. The Nilai 3 Industrial Park has also been identified as another potential source contributing to the issue.
Suspected Origin at Sungai Pajam Farm

The primary cause for the odour pollution has been pinpointed to a large-scale cleaning operation conducted at a duck and goose farm. This process involved the disposal of organic matter, including animal carcasses, which subsequently entered the waterways. This finding is based on the nature of the detected pollutants, which were organic and not petroleum-based.
Impact on Water Treatment Operations

The severity of the odour pollution necessitated the temporary cessation of operations at the Semenyih and Bukit Tampoi Water Treatment Plants (WTPs). Odour readings at the Sungai Semenyih intake point were recorded between three and four TON (threshold odour number) on the day prior to the reporting, while readings at the Bukit Tampoi WTP exceeded 11 TON. This morning, the odour reading at 9:30 AM was still at an unstable eight TON. Operations can only resume once odour readings fall to zero TON.
Widespread Water Supply Disruption

The halt in WTP operations led to an unscheduled water supply disruption affecting 273 areas. This impacted a total of 309,605 accounts spread across four districts: Petaling, Hulu Langat, Kuala Langat, and Sepang. Efforts to mitigate the situation include the deployment of two pumps to supply 27 million litres of water per day into Sungai Langat and 300 million litres per day into Sungai Semenyih, aiming to dilute the contaminated water.

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What caused the recent odour pollution in Sungai Semenyih and Sungai Langat?

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