Director Nguyen Van Phu said, "The Dong Nai River has been polluted for years. The ammonium content in it has always been high but the plant’s treatment system can handle it and ensure quality.”
He said some cyanide originates from the Siep Stream that runs into the lower Dong Nai River.
“The location of the plant’s Hoa An pumping station is higher than the point where the Siep Stream joins the river and so the poison hardly affects the plant,” he said.
The Thu Duc plant has a capacity of 750,000 cubic meters of water a day and is Ho Chi Minh City’s main water supplier.
Dong Nai Province’s Department of Natural Resources and Environment announced March 16 that the cyanide content in the Siep Stream is two times the safety level.