Choosing an efficient mass exchange apparatus for desorption of hydrogen sulphide from reservoir and drainage waters

Authors

DOI:

https://doi.org/10.15587/1729-4061.2024.314049

Keywords:

hydrogen sulfide, water purification, mass exchange devices, desorption rate, bubbling, solution dispersion

Abstract

Industrial wastewater is often contaminated with hydrogen sulfide and sulfides. This poses significant risks to both the environment and human health and life as H2S is extremely toxic. Therefore, water purification from it is vital, and the choice of an effective desorber device is an urgent issue.

This paper investigates the process of H2S desorption from wastewater in mass exchange devices with a continuous bubbling bed (DCBB), a column with falling plates (CFP), and a horizontal device with bucket-like dispersers (HDBD). To analyze the kinetic and technological characteristics of the process, the following indicators were selected: the product of the mass exchange coefficient on the contact surface of phases (K·F), reduced to 1 m3 of the volume of the apparatus, and the degree of hydrogen sulfide desorption.

The most complete desorption of hydrogen sulfide occurs at pH≤5. For practical needs, it is suggested to acidify the water to pH=5.5...6.0. It was established that the partial pressure of H2S increases linearly with increasing temperature, and an increase in salinity from 2...4 to 130...160 kg/m3 leads to its increase by 1.45...1.5 times.

The best desorption indicators can be achieved in HDBD at pH=4.97. The efficiency of cleaning in CFP and DCBB is significantly affected by the specific air flow rate. The highest values (K·F) per 1 m3 that were achieved in desorbers are, mol/(s·Pa·m3): HDBD – 1.94·10-5, in CFP – 5.55·10-6, DCBB – 6.9·10-6. The ratio of the product (K·F) in HDBD to CFP is 3.5, and in HDBD to DCBB 2.8. It was possible to achieve the maximum degree of desorption of 37.8 % in DCBB; in CFP, this indicator is 74.1 %, and in HDBD – 77.7 %. Experimental studies have generally confirmed the effectiveness of using HDBD, and the results obtained under production conditions on real drainage and reservoir waters could find be practically implemented in hydrogen sulfide utilization technologies

Author Biographies

Andriy Helesh, Lviv Polytechnic National University

Doctor of Technical Sciences, Professor

Department of Chemistry and Technology of Inorganic Substances

Yaroslav Kalymon, Lviv Polytechnic National University

Doctor of Technical Sciences, Professor

Department of Chemistry and Technology of Inorganic Substances

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Choosing an efficient mass exchange apparatus for desorption of hydrogen sulphide from reservoir and drainage waters

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Published

2024-10-30

How to Cite

Helesh, A., & Kalymon, Y. (2024). Choosing an efficient mass exchange apparatus for desorption of hydrogen sulphide from reservoir and drainage waters. Eastern-European Journal of Enterprise Technologies, 5(6 (131), 45–54. https://doi.org/10.15587/1729-4061.2024.314049

Issue

Vol. 5 No. 6 (131) (2024): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2024 Andriy Helesh, Yaroslav Kalymon

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