Улаанбаатар хот орчмын Туул голын усны чанарын судалгаа. (Mongolian)

This study purposed to evaluate the water quality of 10 points located between the Terelj national park and the Lun soum in Tuv province along the Tuul River, depending on assessing detailed Physico-chemical and seasonal (except than winter) pollution indicators. The chemical data of water samples from the Tuul River illustrated the water type from neutral to slightly alkaline and belonged to the HCO 3 - - Ca 2+ ; HCO 3 - , SO 4 2- -Na + and HCO 3 - - Ca 2+ , Mg 2+ . The point of Terelj or, moreover, starting points water belongs to excellent water, but water mineralization in the mid of Ulaanbaatar city increased up to 1.2 times. However, mineralization, anions and cations of T6 mixed with wastewater from the Central Wastewater Treatment Plant (CWTP) increased significantly. These parameters decreased along the downstream river at T9, T10 points in the zone of Lun soum. As nutritional polluting constituents like NH4-N, NO2-N, PO4-P, COD concentrations met the permissibility of National Standard (MNS 4586:98) requirements at T1-T5 points in Terelj and Ulaanbaatar city. On the contrary, ranges are overrated by permissible concentration of MNS 4586:98 at T6 point mixed with wastewater from CWTP. In T9, T10 points case, nutritional pollution is being decreased gradually along the river, but natural self-treatment did not process completely. Water quality index (WQI) of Terelj and mid of the city (T1-T5 points) designated as ‘excellent’ and ‘good’ (I-II), inappropriately at the point T6 appointed as ‘very poor’ to ‘unsuitable’ water (IV-V) categories. Interestingly, T7 to T10 issues contributed as ‘poor’ to ‘very poor’ water (III-IV) categories. [ABSTRACT FROM AUTHOR]

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