Desiliconization of ground water at the deironing-demanganization facilities

Summary

The results of investigating the technology of desiliconization of ground water typical for the Tyumen North are presented. It was found that efficient elimination of siliceous, ferriferous and manganese compounds is ensured in the process of water treatment with potassium permanganate in alkalescent environment with subsequent coagulation with AQUA-AURAT™30 polyoxychloride. However, the dosage of coagulant required to provide for the permissible silicon concentration is relatively high. Therefore, additional clarification means (e.g. two-stage filtration) shall be retrofitted into the process flow scheme. Residual aluminium concentration in filtrate did not exceed Maximum Permissible Concentration (MPC).

Key words

coagulant , potassium permanganate , alkalizing reagent , cold low-mineralized ground water , desiliconization , deironing-demanganization

Stabilization treatment of underground waters in the Tyumen North Region

Summary

The necessity of stabilization treatment of underground water used for potable water supply of the Tyumen North settlements is substantiated. The expediency of adding alkaline agents in the process of stabilization at the existing water treatment facilities in particular, is shown. Caustic soda is recommended as a stabilization agent. The in-process tests were carried out with water from Novomikhailovsk and Altymsk aquifiers that are most often used for potable water supply in the region.

Key words

iron , manganese , carbon dioxide , cold low-mineralized ground water , stabilization treatment , alkaline agent , caustic soda

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