Process engineering solutions for the purification
of low-mineralized cold groundwater with chemicals

Summary

The paper completes a series of studies on the purification of low-mineralized cold groundwater, often used for drinking water supply in the Russian regions in permafrost zones. The update of the earlier developed process solutions and expansion of their scope of application are reported. A full description of the chemical processes occurring during water treatment with chemicals including hydrogen peroxide, potassium permanganate, and caustic soda is provided. The proposed process solutions provide for drinking water meeting the regulatory quality standards for organoleptic indicators, iron, manganese, hydrogen sulfide, phenols, and oil products. At the same time the consistency of the water after purification is guaranteed which allows to prevent from the secondary pollution in water mains and distribution networks. Two basic process flow schemes of the water conditioning process are presented that differ in their scope of application depending on the quantitative composition of groundwater. Water quality indicators after purification are presented based on the results obtained during the pilot tests at various sites. It is noted that the developed process solutions provide for upgrading outdated groundwater de-ironing facilities at minimal cost, whereby the standard quality of the water is provided.

Key words

potassium permanganate , cold low-mineralized ground water , stabilization treatment , caustic soda , treatment process flow schemes , hydrogen peroxide , iron, manganese, hydrogen sulfide removal