Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium
The article is devoted to the neutralization of the harmful effects of aluminochrome catalyst sludge. Catalyst sludge is a waste product from petrochemical production and poses a serious threat to the environment and humans because of the toxic hexavalent chromium it contains. The emissions of Russi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Inorganics |
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| Online Access: | https://www.mdpi.com/2304-6740/11/7/284 |
| _version_ | 1797588927796740096 |
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| author | Igor Pyagay Olga Zubkova Margarita Zubakina Viktor Sizyakov |
| author_facet | Igor Pyagay Olga Zubkova Margarita Zubakina Viktor Sizyakov |
| author_sort | Igor Pyagay |
| collection | DOAJ |
| description | The article is devoted to the neutralization of the harmful effects of aluminochrome catalyst sludge. Catalyst sludge is a waste product from petrochemical production and poses a serious threat to the environment and humans because of the toxic hexavalent chromium it contains. The emissions of Russian petrochemical enterprises’ alumochrome sludge is 10,000–12,000 tons per year. In this paper, research related to the possibility of reducing the harmful effects of sludge by converting hexavalent chromium to a less dangerous trivalent state is presented. The reduction of hexavalent chromium was carried out with different reagents: Na<sub>2</sub>SO<sub>3</sub>, FeSO<sub>4</sub>, Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub>, and Na<sub>2</sub>S<sub>2</sub>O<sub>5</sub>. Then, a comparative analysis was carried out, and sodium metabisulfite was chosen as the most preferred reagent. The peculiarity of the reducing method was carrying out the reaction in a neutral medium, pH = 7.0. The reduction was carried out in the temperature range of 60–85 °C and under standard conditions. The maximum recovery efficiency of chromium from the catalyst sludge (100%) was achieved at 85 °C and 10 min. This method did not involve the use of concentrated sulfuric acid, as in a number of common techniques, or additional reagents for the precipitation of chromium in the form of hydroxide. |
| first_indexed | 2024-03-11T00:58:59Z |
| format | Article |
| id | doaj.art-b5d8a43c3d9d4cb5a3a91b1dbd2bda68 |
| institution | Directory Open Access Journal |
| issn | 2304-6740 |
| language | English |
| last_indexed | 2024-03-11T00:58:59Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Inorganics |
| spelling | doaj.art-b5d8a43c3d9d4cb5a3a91b1dbd2bda682023-11-18T19:47:55ZengMDPI AGInorganics2304-67402023-06-0111728410.3390/inorganics11070284Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent ChromiumIgor Pyagay0Olga Zubkova1Margarita Zubakina2Viktor Sizyakov3Scientific Center «Problems of Mineral Mineral and Technogenic Resources», Saint-Petersburg Mining University, 21st Line of V. I., 2, 199106 St. Petersburg, RussiaScientific Center «Problems of Mineral Mineral and Technogenic Resources», Saint-Petersburg Mining University, 21st Line of V. I., 2, 199106 St. Petersburg, RussiaScientific Center «Problems of Mineral Mineral and Technogenic Resources», Saint-Petersburg Mining University, 21st Line of V. I., 2, 199106 St. Petersburg, RussiaScientific Center «Problems of Mineral Mineral and Technogenic Resources», Saint-Petersburg Mining University, 21st Line of V. I., 2, 199106 St. Petersburg, RussiaThe article is devoted to the neutralization of the harmful effects of aluminochrome catalyst sludge. Catalyst sludge is a waste product from petrochemical production and poses a serious threat to the environment and humans because of the toxic hexavalent chromium it contains. The emissions of Russian petrochemical enterprises’ alumochrome sludge is 10,000–12,000 tons per year. In this paper, research related to the possibility of reducing the harmful effects of sludge by converting hexavalent chromium to a less dangerous trivalent state is presented. The reduction of hexavalent chromium was carried out with different reagents: Na<sub>2</sub>SO<sub>3</sub>, FeSO<sub>4</sub>, Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub>, and Na<sub>2</sub>S<sub>2</sub>O<sub>5</sub>. Then, a comparative analysis was carried out, and sodium metabisulfite was chosen as the most preferred reagent. The peculiarity of the reducing method was carrying out the reaction in a neutral medium, pH = 7.0. The reduction was carried out in the temperature range of 60–85 °C and under standard conditions. The maximum recovery efficiency of chromium from the catalyst sludge (100%) was achieved at 85 °C and 10 min. This method did not involve the use of concentrated sulfuric acid, as in a number of common techniques, or additional reagents for the precipitation of chromium in the form of hydroxide.https://www.mdpi.com/2304-6740/11/7/284catalyst sludgehexavalent chromiumreductionneutralizationdeposition |
| spellingShingle | Igor Pyagay Olga Zubkova Margarita Zubakina Viktor Sizyakov Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium Inorganics catalyst sludge hexavalent chromium reduction neutralization deposition |
| title | Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium |
| title_full | Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium |
| title_fullStr | Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium |
| title_full_unstemmed | Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium |
| title_short | Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium |
| title_sort | method for decontamination of toxic aluminochrome catalyst sludge by reduction of hexavalent chromium |
| topic | catalyst sludge hexavalent chromium reduction neutralization deposition |
| url | https://www.mdpi.com/2304-6740/11/7/284 |
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