Study of the influence of groundwater impurities on the iron oxidation rate

21 Apr 2021, 15:35
15m
1223 (Lomonosov st. 9)

1223

Lomonosov st. 9

oral Clean water Clean water

Speaker

Ksenia Machekhina (Igorevna)

Description

The present work is devoted to the study of the process of iron oxidation in groundwater. The main impurity of most groundwater is iron compounds due to geological features. Therefore, the main stage in water treatment technologies is the stage of iron removal which includes several stages: oxidation, precipitation and filtration. The limiting stage is the oxidation or precipitation stage of iron. It depends on the composition of the groundwater. The relevance of this work lies in the determination of the time of iron oxidation in water of various chemical composition, which is important for technologists involved in the development of water treatment systems. This parameter depends on the iron concentration, the iron presence form in water and other impurities in groundwater.
Therefore, the purpose of this work is to study the kinetics of the iron oxidation process depending on the composition of groundwater.
Waters located at a depth from 25 to 200 m are characterized by the invariability of the chemical composition, regardless of the season, due to the maintenance of carbon dioxide equilibrium and the lack of interaction with atmospheric oxygen. When water comes to the surface, the equilibrium is disturbed and chemical reactions begin to actively proceed, which leads to a change in the water chemical composition. This is reflected in the change of pH, oxidation-reduction potential (ORP), the concentration of impurities and organoleptic characteristics. Therefore, the study of the effect of the impurities composition on the rate of iron oxidation was done on model solutions.
It was shown that the pH of the initial solution, the content of hardness salts, the content of organic substances and ammonium ions affect on the iron oxidation. The effective values of the activation energy were determined for each influencing factor. A conclusion is made about the area of the process. The obtained experimental data can be used when choosing a method for removing iron to increase the efficiency of existing installations.
Bibliography
L. N. Shiyan, Е.А. Tropina, K. I. Machekhina, E.N. Gryaznova, V.V. An. Colloid Stability of Iron Compounds in Groundwater of Western Siberia // SpringerPlus Vol. 3 (2014), DOI: 10.1186/2193-1801-3-260, http://www.springerplus.com/content/3/1/260.

Position of speaker Associate Professor
Affiliation of speaker National Research Tomsk Polytechnic University
Publication Impact Factor journals

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