THE latest odour pollution at Sungai Sembah, Selangor, which caused the temporary suspension of the Rantau Panjang water treatment plant (LRA) was likely caused by residual pollution along the riverbank or sediment around the water inlets from a previous incident, said the Selangor Water Management Authority (LUAS).
“On Nov 18, the LRA Rantau Panjang was shut down after odour pollution with a rating of one TON (threshold odour number) was detected at the water intake of the river.
“Observation by Air Selangor at Sungai Sembah as well as investigations by LUAS officers found no odour at Sungai Gong, which channels into Sungai Sembah before joining up with Sungai Selangor, a 17km distance to LRA Rantau Panjang.
“However, at 7pm on Nov 19, LUAS and Air Selangor again detected odour pollution of one TON at Sungai Sembah as well as at the water intake of LRA Rantau Panjang at the same time, which caused the temporary suspension of the LRA, ” it said in a media statement.
LUAS explained that the second incident could be linked to the previous incident following high river flow overnight.
The water authority said that they had activated an alternative pond at Bestari Jaya to flush the water.
“The mitigation measures managed to curb the pollution and the Rantau Panjang LRA was able to resume operations in less than three hours, ” it added.
“All LRAs are currently operational and there was no water service disruption, ” a LUAS spokesman said.
Since September, two instances of odour pollution have been traced to Sungai Gong, one of the tributaries of Sungai Selangor, leading to water supply disruptions affecting over one million account holders in the Klang Valley in the span of barely three months.
Four water treatment plants – Sungai Selangor Phases 1,2, 3 and Rantau Panjang – had to be closed down.
In both cases, the solvents in Sungai Gong were eventually traced to nearby car parts and machinery factories.
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