Justification of the technological scheme of water treatment plants in the Northern zone of the Tyumen region

A characteristic feature of the qualitative composition of natural water of the Northern zone of the Tyumen region, regardless of the season, are: low salt content – less than 200 mg/dm3 and suspended solids – 2–30 mg/dm3, iron content at 0,1-5,5 mg/dm3, high color – 40–130 ˚ of the platinum-cobalt scale. When eliminating color and complex-bound iron from natural water, the greatest difficulties are associated with low salt content and small values of suspended solids. This predetermines a slightly different from the regulations approach to the choice of technological scheme of water treatment. Based on the results of the research, variants of technological schemes of natural water treatment of the northern rivers are proposed.

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Chemical and membrane desalination of natural water with high content of iron-organic compounds

Vestnik IGEU ◽

10.17588/2072-2672.2021.6.005-018 ◽

2021 ◽

pp. 5-18

Author(s):

A.B. Larin ◽

E.A. Karpychev ◽

N.N. Yarunina ◽

A.Y. Loginova

Keyword(s):

Water Treatment ◽

Reverse Osmosis ◽

Organic Compounds ◽

Natural Water ◽

Thermal Power ◽

Combined Cycle ◽

Specific Electrical Conductivity ◽

Running Water ◽

Desalinated Water ◽

Water Treatment Plants

Under the conditions of modernization of Russian thermal power plants (TPP), water treatment plants based on imported membrane technologies are often put into operation without consideration of the quality of the source (natural) water and variable-performance operating modes. At the same time long-running water treatment plants and their capabilities are not considered. In this regard, the cost of additional water is three or more times higher, and the average output is respectively lower than at traditional water treatment plants. Often, one doesn’t take the advantages of reverse osmosis installations based on the rejection of the use of aggressive reagents such as sulfuric acid, etc. The aim of the study is to increase the efficiency of desalinated water production. It is especially important to conduct studies of natural waters with high content of iron-organic compounds characteristic of the regions of the center and north of Russia. The authors have carried out laboratory studies of various, primarily new filter materials, regents, and devices, both at the stages of pre-purification of water i.e., clarification, and at the stages of demineralization of clarified water. Water treatment plants of Ivanovo combined-cycle plant (CCP) and Cherepovets state district power station (GRES) are considered as the subject of the research. It is found out that if one applies ion-exchange and membrane water treatment technologies to treat water with high content of iron-organic compounds, high-quality desalinated water can be obtained. The properties of water are the following: specific electrical conductivity of no more than 0,2 mcm/cm and permanganate oxidizability of no more than 1 MgO/l. Results of studies at the Ivanovo CCP and Cherepovets GRES have shown practicability to coagulate water with aluminum sulfate using an anionactive flocculant, for example, during the flood period. Application of coagulation and ultrafiltration units before reverse osmosis installation ensures removing organic impurities from the water. Based on the obtained research results, recommendations are given for the implementation of the results at Ivanovo water treatment plants.

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Water Decontamination at Water Treatment Plants. A New Approach

Chemistry for Sustainable Development ◽

10.15372/csd2020212 ◽

2020 ◽

Keyword(s):

Water Treatment ◽

Water Decontamination ◽

New Approach ◽

Water Treatment Plants

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Determination of natural radionuclides in waste generated in the potable water treatment plants of the Zona da Mata of the state of Pernambuco- Brazil

Brazilian Journal of Radiation Sciences ◽

10.15392/bjrs.v7i2a.763 ◽

2019 ◽

Vol 7 (2A) ◽

Author(s):

Adriana Muniz De Almeida Albuquerque

Keyword(s):

Water Treatment ◽

Potable Water ◽

Natural Radionuclides ◽

The United States ◽

Radioactive Material ◽

Human Consumption ◽

Radiological Protection ◽

Natural Occurrence ◽

Water Treatment Plants ◽

Potable Water Treatment

The water purification procedure aims to obtain a product appropriate for human consumption, minimizing the presence of contaminants and toxic substances present in the water. Among these contaminants, some radionuclides of natural origin, such as uranium, thorium and their descendants, have been identified. Studies have shown that the stages of purification are quite effective in removing the radionuclides contained in water. The removal is due to co-precipitation of the radionuclides with the suspended materials and the precipitated material is accumulated and characterized as a Technologically Concentrated Natural Occurrence Radioactive Material (TENORM) by the United States Environmental Protection Agency (USEPA). This residue can present significant levels of radioactivity and, when discarded in the environment without any treatment, can generate a problem of environmental impact and a risk to the health of the population. In this way, some gamma emitters of the series of U, Th and the K-40 were determined in the residues generated at the Potable Water Treatment Plants – PWTPs in six municipalities of Pernambuco. The results obtain corroborate the classification of the residues generated in the PWTPs as concentrators of the radioactive components contained in the water supplied to the system and reinforce the need for the release to the environment, which is the usual way of disposal of this waste, to be carried out only after considering the radiological protection standards established.

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