scholarly journals On the modeling of a dissolved iron removal from underground water by filtration

2018 ◽  
pp. 37-45 ◽  
Author(s):  
V.L. Polyakov ◽  
Keyword(s):  
Underground Water ◽  
Iron Removal ◽  
Dissolved Iron

Optimization of Kaolin Bioleaching by Aspergillus niger

2007 ◽  
Vol 20-21 ◽  
pp. 115-118 ◽  
Author(s):  
M. Ranjbar ◽  
E. Aghaie ◽  
M.R. Hosseini ◽  
Mohammad Pazouki ◽  
F. Ghavipanjeh
Keyword(s):  
Aspergillus Niger ◽  
Ph Value ◽  
Iron Concentration ◽  
Iron Removal ◽  
Pistachio Shell ◽  
Dissolved Iron ◽  
Initial Ph ◽  
Negative Effect ◽  
Concentration Changes ◽  
Central Composite

In this paper, a central composite design was applied to optimize the bioleaching of iron from a kaolin sample containing 2.2% iron impurity by Aspergillus niger isolated from pistachio shell. The strains were inoculated into 500 ml flasks containing 100 ml media consisted of (g/l): sucrose 120; NH4NO3 0.45; KH2PO4 0.1; MgSO4.7H2O 0.3; FeSO4.7H2O 10-4; ZnSO4.7H2O 25×10- 5. The effects of initial pH, sugar and spore concentrations on iron removal extent were investigated. The two-level factorial design points were pH 2 and 5, sugar conc. 70 g/l and 130 g/l, spore conc. 9×107 and 35×107 spores/l. Also, the increase of dissolved iron, oxalic acid concentration, changes in pH value, and sugar concentration were registered. Consequently, after 10 days, the iron concentration of the best condition reached to 179.3 ppm that means 38.8% of the total iron content is removed. Furthermore, the data analysis showed that all the factors are significant, and the iron removal extent increases by increasing the initial pH to 4.4, sucrose content to 93.8 g/l, and spore concentration to 305.5 spores/μl, but further increase in each factor value has negative effect on the response.

scholarly journals Statistical Treatment of Bleaching Kaolin by Iron Removal

2017 ◽  
Vol 57 (4) ◽  
Author(s):  
Román Ángel Hernández Hernández ◽  
Felipe Legorreta García ◽  
Leticia Esperanza Hernández Cruz ◽  
Antonia Martínez Luévanos
Keyword(s):  
Atmospheric Pressure ◽  
Statistical Treatment ◽  
Influential Factors ◽  
Iron Removal ◽  
Dissolved Iron ◽  
Dependent Variables ◽  
Leaching Experiments ◽  
Effects Of Temperature ◽  
Iron Solubilization

In the present study, oxalic acid was used as a leaching reagent to remove iron from a kaolin mineral. Statistical analysis was conducted to determine the most influential factors in the dissolution of iron from the kaolin mineral. Our goal was ferric iron solubilization and its reduction to ferrous iron to improve the iron removal in the acid medium. Leaching experiments were conducted at atmospheric pressure. A two-level factorial design of the type 2<sup>4</sup> was utilized. The dependent variable was the percentage of dissolved iron, and the dependent variables in this study were acid concentration (0.35 and 0.50 M), temperature (75 °C and 100 °C), leaching time (2 and 4 h), and pH (1.5 and 2.5). An analysis of variance revealed that the effects of the factors temperature (b), pH (d), and the combined effects of temperature and time (bc) resulted in the maximum dissolution of iron of 88% at 100 °C, giving a kaolin mineral with a whiteness index 93.50%.

Effect of adsorption on filtration results of groundwater

2004 ◽  
Vol 4 (5-6) ◽  
pp. 157-163
Author(s):  
J. Sallanko ◽  
E. Lakso ◽  
M. Lehmikangas
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Iron Removal ◽  
Iron Particles ◽  
Dissolved Iron ◽  
Oxidized Iron ◽  
Formed Precipitate ◽  
High Level ◽  
Dissolved Form ◽  
Iron And Manganese

Groundwaters in Finland are soft and acidic, and the main substances that require treatment are iron and manganese. Iron removal is usually relatively easy by oxidizing dissolved iron into an undissolved form either by aeration or chemical oxidization and removing the formed precipitate by sand filtration, for example. If the raw water contains high amounts of organic matter, problems may arise when using the traditional methods for iron removal. In Finland it is quite common that groundwater contains both high levels of iron and humus. The groundwater of Kukkala intake plant in Liminka has been found problematic due to the high level of organic matter and therefore this research studied the removal of iron from this water by means of oxidation with hydrogen peroxide and filtration. Iron was oxidized with hydrogen peroxide and when the dosage reached 3 mg l−1, all iron was in trivalent form, which means that nearly all of it was in undissolved form, i.e. in fractions greater than 0.45 μm. Oxidized iron particles were, however, very fine and they could not be removed by sand/anthracite filtration. However sand/anthracite filtration was able to remove iron well without the feed of oxidation chemicals, and the iron was then led to the filter in bivalent dissolved form, thus the filter operated as an adsorption filter.

scholarly journals Deironing of Underground Water with Modified Refractory Chamotte

2021 ◽  
pp. 135-146
Author(s):  
Keyword(s):  
Iron Content ◽  
Iron Oxidation ◽  
Base Material ◽  
Precursor Solution ◽  
Underground Water ◽  
Iron Removal ◽  
Catalytic Material ◽  
Cis Countries ◽  
Permissible Rate ◽  
Iron And Manganese

Water from underground sources in Russia and the CIS countries mainly contains higher concentrations of iron and manganese. With a permissible rate of iron content in drinking water of 0.2–0.3 mg/L, its content in groundwater can reach 40 mg/L. To remove excess soluble iron, it is oxidized to insoluble forms. For these purposes, iron removal filters are used. This research describes the preparation of modified catalytic material to intensify the process of deferrization of underground water. Methods. Refractory chamotte of a fraction of 3–5 mm was selected as the base material, and an iron-containing precipitate of the purification of washings waters from iron removal filters was used as the source of iron for the preparation of the precursor solution. As a result of the modification, the formation of a finely dispersed and crystalline structure of hematite on the chamotte surface occurred. The effect of the dose of iron nitrate on the iron content on the surface of the modified material is established. Results. During pilot tests, it was found that an increase in the concentration of iron on the surface from 5.8 wt.% in the initial chamotte to 19.0, 48.7 and 55.8 wt.% in the modified led to an increase in the degree of iron oxidation from Fe2+ to Fe3+ from 41.4% to 65.1, 73.0 and 80.0%, respectively. The proposed method has significant advantages over analogues due to significantly lower energy consumption, resource consumption and impac on environmentt.

scholarly journals Technological model of water contact iron removal

2018 ◽  
Vol 39 (1) ◽  
pp. 93-99 ◽  
Author(s):  
Serhii Martynov ◽  
Victor Fylypchuk ◽  
Vitalii Zoshchuk ◽  
Serhii Kunytskyi ◽  
Andrii Safonyk ◽  
...  
Keyword(s):  
Material Balance ◽  
Underground Water ◽  
Iron Removal ◽  
Technological Parameters ◽  
Iron Compounds ◽  
Water Contact ◽  
Head Losses ◽  
Parallel Processes ◽  
Water Composition ◽  
Kinetics Of

AbstractDifferent types of filters are used to remove iron from underground water, one of them is foam polystyrene. Depending on the chemical water composition, tasks for water supply and other working conditions of iron-removing filters, it is necessary to define an exact grain size, specific granulometric composition, the thickness of the layer and the adequate rate of filtration. This kind of problems is multifactorial and its solution is based on the mathematical modelling.As a rule, two parallel processes considered during iron removal of underground water in filters: efficiency of water treatment and growth of head losses. Therefore, the model of water iron removal based on two main blocks, clarifying block takes into account the material balance and kinetics of the process; hydrodynamic block describes the dynamics of head loss in the granular loading. The kinetics of the detention of iron compounds in granular loading consists of two mutually opposite processes. With an increase of the amount of adsorption-catalytic precipitate, the rate of sorption of iron compounds and oxidation of ferric iron increases and the efficiency of iron-removing increases. On the other hand, with decreasing porosity of loading the true velocity of the fluid increases, that reduces the intensity of adhesion of iron compounds.Developed mathematical model allows for determining optimal values of structural and technological parameters of iron-removing filters taking into consideration the specific filtering conditions.

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