Integrated technology for conditioning low-mineralized cold ground water

Summary

An advanced integrated technology for conditioning low-mineralized cold groundwater is presented. The technology was developed for the purpose of supplying drinking water to the oil and gas-bearing regions of the Tyumen North. With a favorable ratio of fresh water resources and the actual volume of water consumption in this region of Russia, the issue of drinking water supply from underground aquifers remains acute due to the problematic water quality and low efficiency of the treatment facilities. The technology is intended for removing iron, manganese, hydrogen sulfide and providing for the stabilization treatment of water. The main work including laboratory studies and pilot tests was carried out in the period 2001–2020. On the basis of the developed process solutions, water treatment facilities have been built and successfully operated in the cities of Noyabrsk (75 thousand m³/day, 2006) and Novy Urengoy (65 thousand m³/day, 2007). Additional tests of the technology carried out in Khanty-Mansiisk and Komsomolsk-on-Amur confirmed its effectiveness. The technology involves using hydrogen peroxide and potassium permanganate as the basic chemicals for the oxidation of water pollutants, as well as using an alkaline chemical for pH adjustment and stabilization treatment. To meet the requirements of the WHO standard for the concentrations of iron and manganese, an additional flocculant can be used. The data on the composition of groundwater used for testing are summarized, and on their basis the recommended area of application of the developed technology is determined. The basic process flow scheme of conditioning low-mineralized cold groundwater in view of 15 years of experience in operating the existing facilities, and of advanced solutions for dosing and mixing of chemicals, is presented. It is indicated that the technology also provides for a partial reduction in the silicon concentration in purified water (up to 30%). The developed technology ensures stable drinking water with a standard residual concentration of iron, manganese and hydrogen sulfide.

Key words

deferrization , hydrogen peroxide , ground water , potassium permanganate , demanganization , stabilization treatment , caustic soda , hydrogen sulfide removal

DOI 10.35776/MNP.2020.02.01
UDC 628.16.081:542.943-92

Seliukov Aleksandr, Rakhimov V. V.

Reconstruction of the ground water treatment plant
in Noyabrsk (Yamal-Nenets Autonomous Okrug)

Summary

The main results of technological surveys that form the basis for the project of reconstruction of the ground water treatment plant in Noyabrsk (Yamalo-Nenets Autonomous Okrug) are presented. The plant was built according to the project of DAR/VODGEO CJSC (Moscow) and commissioned in September 2006. The plant uses a new technology that provides for the sequential treatment of water with two oxidizing agents – hydrogen peroxide and potassium permanganate to remove iron and manganese compounds. The project shortcomings and incomplete implementation of design solutions complicate the regular operation of the plant and make it difficult to ensure the standard quality of drinking water. It was stated that ground water contained hydrogen sulfide in concentrations up to 0.1 mg/dm³, which required extra consumption of chemicals. Manual dosing of chemicals causes significant deviations from the required doses: from –14.5 to +19.1% for hydrogen peroxide and from –8.5 to +9.1% for potassium permanganate. It is pointed out that crude products of potassium permanganate produced by the P. R. China used as a chemical agent in drinking water supply, pose a threat of increased toxicity of drinking water. The determined value of the Langelier index (index of saturation with calcium carbonate) of ground water (–2.35 units) allowed to conclude that stabilization treatment by alkalization is required. The performed test water treatment with hydrogen peroxide and potassium permanganate in combination with alkalization showed that this process provided for achieving the residual concentrations of manganese < 0.1 mg/dm³ and total iron 0.1–0.15 mg/dm³ in the absence of residual hydrogen sulfide. However, to produce water of constant standard quality, high accuracy of chemical dosing is required that can only be provided by completely automated dosing. The project of upgrading the ground water treatment plant in Noyabrsk designed on the basis of technological research, allows to resolve the existing problems and ensure the standard quality of drinking water.

Ключевые слова

deferrization , ground water , hydrogen peroxide , potassium permanganate , demanganization , stabilization treatment , caustic soda , hydrogen sulfide removal

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UDC 628.16.094.7

Seliukov Aleksandr

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

UDC 628.16.081
DOI 10.35776/VST.2026.05.01

Seliukov Aleksandr

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

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