Studying patterns in the flocculation of sludges from wet gas treatment in metallurgical production

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.181300

Keywords:

flocculation, aggregation, strength of aggregates, deposition rate, optimization, hydromechanical destruction of floccules

Abstract

The influence of a solid phase concentration in the model sludges of wet gas purification, as well as the flocculant consumption, on a change in the solid phase sedimentation rate and the strength of floccules has been examined. This is important because fluctuations in the solid phase concentration in waste water represent an uncontrolled process that significantly affects the kinetics of the solid phase sedimentation and leads to an increase in the flocculant consumption.

We have proposed a procedure for determining the sedimentation rate of the flocculated sludge and the strength of floccules following the hydromechanical influence, which takes into consideration the solid phase concentration and the flocculant consumption. The study was carried out on model waste water, synthesized by mixing the dust from dry gas purification at actual production site with water. It has been determined that the solid phase concentration affects the rate of floccule deposition. It has been established that the optimum conditions for aggregate formation within a given model system are observed at the solid phase concentration in the interval 8–12 g/l. Increasing the solid phase concentration above 16 g/l decreases the floccule sedimentation rate disproportionately to the flocculant concentration. It is possible to reduce flocculant consumption and to optimize its dosage by carrying out a cleaning process taking into consideration the specified patterns.

It was established that the hydromechanical influence on aggregates exerts the destructive effect, whose degree depends on the solid phase concentration. In particular, increasing the rate of fluid motion leads to greater damage to floccules than increasing the time for a less intense exposure. The way to minimize the destructive effect on floccules could be lowering the suspension transportation speed resulting from a decrease in the installation performance or through the increased cross-section of the channel (a pipeline). An increase in the solid phase concentration of the model system above 16 g/l is accompanied by a significant reduction in the strength of floccules. Therefore, when designing wastewater treatment plants that utilize flocculants, it is necessary to provide optimum conditions for aggregation and to minimize the hydromechanical effects on floccules by lowering the velocity of fluid motion

Author Biographies

Oleksii Shestopalov, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD, Associate Professor

Department of Chemical Technique and Industrial Ecology

Oleksandr Briankin, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Postgraduate Student

Department of Chemical Technique and Industrial Ecology

Musii Tseitlin, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Doctor of Technical Sciences, Professor

Department of Chemical Technique and Industrial Ecology

Valentina Raiko, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD, Professor

Department of Chemical Technique and Industrial Ecology

Oksana Hetta, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Postgraduate Student

Department of Chemical Technique and Industrial Ecology

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Published

2019-10-21

How to Cite

Shestopalov, O., Briankin, O., Tseitlin, M., Raiko, V., & Hetta, O. (2019). Studying patterns in the flocculation of sludges from wet gas treatment in metallurgical production. Eastern-European Journal of Enterprise Technologies, 5(10 (101), 6–13. https://doi.org/10.15587/1729-4061.2019.181300

Issue

Vol. 5 No. 10 (101) (2019): Ecology

Section

Ecology

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Copyright (c) 2019 Oleksii Shestopalov, Oleksandr Briankin, Musii Tseitlin, Valentina Raiko, Oksana Hetta

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