Influence of aeration rate and method of process activation on the degree of purification of zinc-containing waste water by ferritization

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.248166

Keywords:

ferritization, zinc ions, galvanic waste water, electromagnetic pulse discharges, ferrite deposits

Abstract

The aeration rate for the degree of purification of highly concentrated galvanic wastewater from zinc and ferrum ions was investigated using various activation methods. It is shown that the intensity of aeration has a significant effect on the quality of wastewater treatment and the characteristics of water treatment sludge. The efficiency of the use of an energy-saving method for activating the ferritization process with the use of electromagnetic pulses for the extraction of zinc ions from wastewater has been confirmed.

It was determined that with an increase in the aeration rate to 3.5 dm3/min per 1 dm3 of the reaction mixture and the use of thermal activation of the process, the residual concentration of zinc ions remains within the range of 0.12÷0.2 mg/dm3. In this case, the concentration of ferrum ions decreases to values of 0.08÷0.14 mg/dm3. It was found that at an aeration rate of 2.5 dm3/min and the use of pulsed electromagnetic (EMP) activation, the residual concentrations of heavy metal ions decrease to values of 0.08÷0.16 mg/dm3. Comparison of the results indicates the advisability of using low rates of aeration of the reaction mixture. This, together with the use of resource-saving EMR process activation, allows to achieve a significant reduction in energy costs.

The quantitative phase composition of ferritization precipitates was determined, in which the crystalline phases of zinc ferrite Zn2Fe2O4 and magnetite Fe3O4, as well as ferrum oxyhydroxide FeO (OH) and sodium sulfate Na2SO4, prevail. It is found that with an increase in the volumetric aeration rate, the proportion of the ferrite phase increases. At an aeration rate of 2.0 dm3/min, more than 85 % of the zinc ferrite phase was found in the sediments. Taking into account the qualitative and quantitative composition of precipitates, it is recommended to use them in the production of building materials.

The experimental results obtained make it possible to provide a comprehensive processing of liquid galvanic waste.

Author Biographies

Bogdan Yemchura, Kyiv National University of Construction and Architecture

Postgraduate Student

Department of Water Supply and Drainage

Gennadii Kochetov, Kyiv National University of Construction and Architecture

Doctor of Technical Sciences, Professor

Department of Chemistry

Dmitry Samchenko, Kyiv National University of Construction and Architecture

PhD, Senior Researcher

Scientific Research Part

Oleksandr Kovalchuk, Kyiv National University of Construction and Architecture

PhD, Senior Researcher

Scientific-Research Institute for Binders and Materials named after V. D. Glukhovsky

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Published

2021-12-29

How to Cite

Yemchura, B., Kochetov, G., Samchenko, D., & Kovalchuk, O. (2021). Influence of aeration rate and method of process activation on the degree of purification of zinc-containing waste water by ferritization. Eastern-European Journal of Enterprise Technologies, 6(10 (114), 16–22. https://doi.org/10.15587/1729-4061.2021.248166

Issue

Vol. 6 No. 10 (114) (2021): Ecology

Section

Ecology

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Copyright (c) 2021 Bogdan Yemchura, Gennadii Kochetov, Dmitry Samchenko, Oleksandr Kovalchuk

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