The flow of the main water source of Ulaanbaatar City, the Tuul River, is narrowing year by year and becoming too polluted. The pollution of the Tuul River has become a headache for officials in charge. 

A survey was conducted on samples and analysis of the chemical pollutants found in the Tuul River last month. The survey was carried out in a number of places along the Tuul River across the City to Tuul Songino upper, Tuul Songino lower, Tuul Cliff and the Central Drainage Area.

The surface water quality of the Tuul River water that mixes with waste water from the Central Drainage outside of the City from Songino to Tuul Cliff was very poor compared to the MNS 4586-98 standard. Including beneficial biological content the levels were 1.41 – 64.1 times higher than standard, meaning it is too contaminated.

It was determined that the levels of acidize of permanganate were 9.8-17.0, ammonium nitrate 2.8-3.2, nitrate nitrogen 4.5-43.5 and phosphorus 1.4 times higher than standard.

But the water treatment quality of the Central Drainage water was 51.3 percent as a result of sample and chemical analysis surveys.

The treated water from the Central Drainage contains 282.3 ml biochemical oxygen,  ammonium nitrate 32.9 ml, nitrate nitrogen 0.056 ml and phosphorus 2.417 ml.

This means that the biochemical oxygen, ammonium nitrate and phosphorus are times 14.1, 5.4 and 1.6 higher respectively than the approved MNS4943:2011 standard of treated wastewater to be released into nature.