Demanganization of River Water

Summary

One of the intractable problems of public utilities for treatment of water from surface sources, an impossibility of water demanganization using the classical scheme of water treatment, is considered. The results of studies of river water aftertreatment for manganese with the help of potassium permanganate at the water supply facilities of the city of Pugachev, Saratov Reg., are presented. In the course of selection of the method of reducing the manganese content the pH value and redox potential of the medium are taken into account. The studies conducted and the testing operation of the system of potassium permanganate dozing show that the treatment using this reagent ensures the residual content of manganese in potable water meeting the specified requirements.

Key words

potable water , water treatment , manganese , water source , potassium permanganate , demanganization

DOI 10.35776/VST.2021.07.01
UDC 628.16.081

Seliukov Aleksandr

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

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UDC 628.16.081

Seliukov Aleksandr, Baikova Ida

**Deironing-demanganation of ground waters at the Severny intake facilities of Khanty-Mansiysk**

Summary

The results of investigating the process of deironing-demanganation of ground waters at the Severny intake facilities of Khanty-Mansiysk are presented. Ground water subject to treatment is characterized by low hardness, low alkalinity, low salt concentration and temperature values typical for the waters in the north of Tyumen. The water treatment technology applied at the intake facilities does not ensure meeting the water quality standards for iron and manganese. An alternative method of oxidation with potassium permanganate is suggested. As a result of the pilot tests at the Severny intake facilities the optimal dose of potassium permanganate that provided for decreasing iron and manganese concentration to the standard level was determined. It was shown that preliminary alkalization of the treated water to pH 7.5 and 8.5 allows 3–10 decrease of the dose.

Key words

deferrization , ground water , potassium permanganate , demanganization , process tests

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UDC 628.161.2

Raff P. A., Seliukov Aleksandr

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

DOI 10.35776/VST.2022.04.02
UDC 628.161.3:628.168.3

Seliukov Aleksandr, Raff P. A., Mishina T. F.

Pre-project in-process testing river water purification in the Arctic Circle

Summary

The results of pre-project in-process testing purification of water of the Vary-Khadyta River, the source of drinking and domestic water supply for the village of Yar-Sale (Yamal-Nenets Autonomous Okrug), are presented. Throughout the year the permissible concentration of iron, manganese, suspended solids and compounds in the river water that cause the water color is exceeded. Low temperatures, alkalinity and salinity result in the low level of water stability (Langelier index from –3.8 to –1.1 points). Water treatment facilities in Yar-Sale village (WTF-50) do not provide for the standard quality of purified water. This due to both incorrect water treatment technology that involves only filtration for clarification, and an incomplete set of chemicals required to produce drinking water. During the upgrade of the treatment facilities replacing the technology with the traditional clarification flow scheme (sedimentation – filtration) because of the periodic use of high doses of coagulant, as well as supplementing the chemical treatment with processes of alkalization and oxidation of the river water manganese with potassium permanganate was proposed. To assign the design modes of chemical water treatment, in-process tests were carried out under the conditions of the WTF of Yar-Sale village. For clarification and color removal, the chemicals used at the WTF of Yar-Sale village were applied (POHA «Aqua-Aurat-30^TM» coagulant, flocculant Praestol 2530). It is shown that using only these chemicals did not provide for the standard quality of drinking water. To enhance the efficiency of purification, it is proposed to carry out chemical treatment in two stages: upstream the sedimentation tanks – alkalization, coagulation and flocculation, then upstream the filters – additional alkalization, oxidation of manganese with potassium permanganate and additional flocculation. The operational doses of chemicals were determined, that ensure the production of stable drinking water meeting the requirements of the current regulatory documents. Based on the test results obtained, a standard operating procedure for designing the upgrade of the WTF-50 of Yar-Sale village was developed.

Key words

deferrization , potassium permanganate , demanganization , river water , stabilization treatment , soda ash , color removal , «Aqua-Aurat-30тм» , Praestol 2530

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