Wastewater treatment in the electroplating industry using composite coagulants-reducers

Кузин, Е. Н.; Averina, Yu. M.; Kurbatov, A. Yu.; Sakharov, P. A.

doi:10.17580/tsm.2019.10.15

Cited by 5 publications

(6 citation statements)

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“…One knows that titanium compounds, when added to conventional coagulants, help improve the performance of the latter while saving reagents as their effective dose would be reduced [20]. As the use of iron salts as coagulants lead to water contamination with iron, aluminium sulphates were used in further experiments.…”

Section: Findings and Discussionmentioning

confidence: 99%

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Titanium-containing coagulants for foundry wastewater treatment

Кузин¹,

Kruchinina²

2020

cisisr

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Setting up a circulation water supply system is a prerequisite for a modern competitive steel making company. The most frequent problem faced by steel makers includes the challenge of removing suspended solids from large volumes of wastewater. Residual concentration of suspended solids (1-10 mg/l) is the main criterion of treatment efficiency. The most difficult task is to remove particles smaller than 1-2 microns, which stay suspended for a long time. One of the biggest sources of wastewater includes the process of removing residual molding sand from machine parts by water jet surface cleaning. Apart from high concentrations of suspended solids, process wastewater have high concentrations of dissolved organic compounds and require prior treatment before it can go to municipal wastewater treatment plants. Titanium-containing coagulants are being used more and more commonly in water treatment processes due to their high efficiency and the lack of most of the drawbacks inherent in conventional coagulants. This paper compares the conventional coagulants (i.e. aluminum and iron compounds) and coagulants containing titanium salts. In addition, complex titanium-containing coagulants were tested in the actual process of removing residual molding sand from machine parts by water jet surface cleaning. The findings show that titanium tetrachloride outperforms the conventionally used aluminum sulphate and iron chloride, while the effective dose of titanium tetrachloride is on average 2.5 to 3.0 times smaller. The obtained experimental data characterize the effect of added titanium compounds on the water treatment efficiency when conventional reagents are used. It was found that the addition 7.5 wt% of titanium tetrachloride to the conventional aluminum sulphate increases the treatment performance of the latter by 30%. The high efficiency of titanium-containing reagents is due to specific hydrolysis effects, as well as nucleation and flocculation at the surface of hydrolysis products. The rate of sedimentation and filtration of sludges resultant from water treatment with titanium-containing coagulants significantly exceeded that reached when using conventional reagents. The use of titanium-containing reagents will enable to transfer to smaller settlers and filters, reduce the consumption of reagents and reach an enhanced treatment performance. The treated water can be reused or discharged into municipal sewage treatment plants. This research study was carried out as part of the programme supporting research projects carried out by young staff of D. Mendeleev University of Chemical Technology of Russia (Application З-2020-013)

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Section: Findings and Discussionmentioning

confidence: 99%

“…What is gaining popularity today is titanium-containing coagulants. Researcher teams from Russia and China have proved that titanium-containing coagulants have high efficiency in water treatment applications [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Titanium-containing coagulants for foundry wastewater treatment

Кузин¹,

Kruchinina²

2020

cisisr

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“…Many domestic [1][2][3][4] and foreign [5][6][7][8][9][10][11] authors considered the problems of corrosion protection. Corrosion processes can occur during storage and transportation of water with different applications [12,13], oil transportation processes [14], technological processes in hightemperature conditions (heat exchangers, boilers etc.) [15,16], as well as in production of chemically active substances (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Annual metal losses caused by corrosion can achieve 12 % of total metal production, and this calculation does not take into account indirect losses which are connected with recoveries after accidents, downtimes of production facilities etc. [12,13,19].…”

Section: Introductionmentioning

confidence: 99%

Study of electrochemical properties of austenitic chromium-nickel steel 12Kh18N10T in concentrated sulfuric acid

Zolotukhin,

Kurbatov,

Grunskiy

et al. 2023

cisisr

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Considerable attention has always been paid to the issues of protection against chemical corrosion of technological equipment operating in aggressive environments, and even now this issue does not lose its relevance. Recovery of absorption heat is an integral part of the process of minimizing energy costs, and that is why special requirements are imposed on the quality and service life of heat exchange units. Within the framework of the work done, the electrochemical behavior of austenitic nickel-containing steel grade 12Kh18N10T (equivalent of AISI 304), used for the manufacture of process equipment for sulfuric acid production processes by the double contact -double absorption method, was studied. For the studied sample of austenitic nickel-containing steel, anodic potentiodynamic polarization curves were obtained, on which two weakly manifested passivation regions were noted. It has been established that the predominant contribution to metal losses is made by chemical corrosion, while during the operation of steel structures, iron is leached from the surface layer with formation of a protective nanofilm. Thickness of the resulting protective film is 35 nm or more, with the exposure time of steel in hot sulfuric acid for 200 hours. Increasing of the exposure time does not significantly affect the thickness or composition of the protective coating. Using X-ray phase analysis, it was established that the protective film is based on nickel and chromium compounds. The corrosion rate of equipment in the presence of a protective film does not exceed 0.1 mm/year, there are no pitting and intergranular corrosion. The data obtained will allow not only predicting and planning repair and maintenance work, but also organizing a corrosion prevention system without introducing additional reagents into the system.

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“…Among inorganic sorption materials, zeolites are widely used in practice. These natural materials have thermal and radiation stability, high selectivity, fairly good sorption properties, and the possibility of obtaining them in granular form make them very attractive for use in the water sector [12]. Zeolites can absorb not only ions of heavy metals, organic pollutants, oil products, pesticides, radioactive elements, but also pathogenic microorganisms, bacteria and viruses.…”

Section: Introductionmentioning

confidence: 99%

Purification of wastewater from heavy metal ions using nanostructured adsorbents

Konyratbekova,

Shopanbek,

Nurzhanova

et al. 2023

KIMS/CUMR/MShKP

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The activities of industrial enterprises in ferrous and non-ferrous metallurgy and other industries lead to environmental pollution with wastewater containing harmful substances that, even in small quantities, have a rather serious negative impact on human health and the state of the biosphere. There are a large number of natural sorbents used to solve water treatment problems. Among inorganic sorption materials, zeolites are widely used in practice. These natural materials have thermal and radiation stability and high selectivity. The purpose of this article is to study the sorption capacity of zeolites modified with nanostructured rare metals in several ways, with different options for activating the matrix to improve sorption properties with respect to ions of heavy and non-ferrous metals. Based on the experiments conducted, it was proven that zeolites modified with vanadium and titanium nanocompounds are highly effective in removing heavy metal ions from wastewater. The resulting composition on a zeolite matrix creates a highly dispersed solid phase of nanoparticles in the form of a sol-gel. Such systems have an excess of energy, which leads to increased reactivity and adsorbing properties. It is obvious that the activation of zeolites makes it possible to obtain a wider range of active centers of different nature. This determines the varied use of zeolites in the technological system for treating wastewater from heavy and non-ferrous metal ions, which will make it possible to achieve MPC standards.

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Wastewater treatment in the electroplating industry using composite coagulants-reducers

Cited by 5 publications

References 0 publications

Titanium-containing coagulants for foundry wastewater treatment

Titanium-containing coagulants for foundry wastewater treatment

Study of electrochemical properties of austenitic chromium-nickel steel 12Kh18N10T in concentrated sulfuric acid

Purification of wastewater from heavy metal ions using nanostructured adsorbents

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