October 5, 2020 7:31 AM
SEPANG: The odour pollution in Sungai Semenyih, which resulted in the closure of the Sungai Semenyih and Bukit Tampoi water treatment plants (LRA) since 4.30pm yesterday, is suspected to have originated from the Nilai Industrial Estate in Negeri Sembilan.
Environment and Water Minister Tuan Ibrahim Tuan Man said initial investigations found that the polluted water was flowing to Sungai Semenyih from Sungai Batang Benar, close to the industrial area.
“We have to wait for the odour pollution to subside before the plants can operate again. As of now, we are not sure how long (it will take) because we are still investigating the cause,” he said.
Tuan Ibrahim was speaking at a press conference with Selangor Menteri Besar Amirudin Shari after listening to a briefing from Air Selangor at the Sungai Semenyih water treatment plant raw water pump station at Jenderam Hilir here last night.
A total of 309,687 households in the Petaling, Hulu Langat, Kuala Langat and Sepang districts are experiencing unscheduled water supply disruptions because of the shutdown.
Tuan Ibrahim said the water sample taken from Sungai Semenyih at 4.30pm yesterday measured 4 TON (threshold odour number) and at 9pm it had increased to 11 TON.
“It is difficult for us to predict whether it (TON) will increase further, as long as the root cause has not been identified and stopped. The colour (of the river water) is also turning murky,” he said.
Tuan Ibrahim stressed that those responsible for causing the pollution would be instructed to shut down operations, with legal action to be taken against them.
Amirudin said authorities had contacted the Negeri Sembilan government and the state’s Department of Environment.
“Sungai Batang Benar is the tributary of Sungai Pajam, and from Sungai Pajam, water flows into Sungai Semenyih. The distance is about 30km, and it (pollution) is now not only cross-district but also cross-state,” he said.
For a longer-term solution, he said the Selangor government had discussed with the environment and water ministry to use water from the Putrajaya Lake as an alternative in the event of a water supply disruption in Selangor.
“We have made a calculation, if there is pollution, we can last for about seven days (using water from the Putrajaya Lake). With the commitment given by the minister (Tuan Ibrahim) we hope to overcome the problem, and we are ready to discuss the costs involved,” he said.