Advanced neutralization technique for the treatment of highly acidic wastewater from steel rolling mills of western Rajasthan
© 2024 Water Environment Federation.
| Veröffentlicht in: | Water environment research : a research publication of the Water Environment Federation. - 1998. - 96(2024), 12 vom: 22. Dez., Seite e11158 |
|---|---|
| 1. Verfasser: | |
| Weitere Verfasser: | , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2024
|
| Zugriff auf das übergeordnete Werk: | Water environment research : a research publication of the Water Environment Federation |
| Schlagworte: | Journal Article acidic effluent treatment gypsum extraction heavy metal removal industrial water treatment steel industry waste waste to value Steel 12597-69-2 Wastewater mehr... |
| Zusammenfassung: | © 2024 Water Environment Federation. In this study, we developed an economical treatment process for highly acidic effluents from steel rolling mills containing toxic heavy metals. Our method involves a pH-dependent approach using mining waste and hydrated lime. The treatment occurs in two steps: First, metal oxides precipitate at pH 3-3.5 using mining waste, followed by lime precipitation at pH 9-9.5. The process, completed in less than 6 h without heavy machinery, reduces sludge formation by extracting high-purity gypsum, a valuable industrial product. Water quality posttreatment matches local groundwater standards. Compared to conventional methods like common effluent treatment plant (CETP) in Jodhpur, India, our approach reduces operational costs by over 58%. In this study, we also characterized the by-product formed, that is, gypsum using various characterization tools and performed a detailed cost analysis. PRACTITIONER POINTS: A quick, efficient, and economical treatment process for extremely acidic (pH ~ 1) wastewater from steel industries. Stepwise treatment strategy without involving heavy machinery or high manpower. Processed water quality closely resembles groundwater with all the major heavy metals been removed. Sludge quantity reduced by regeneration of pure gypsum (96% purity). Reduced the overall operation cost of effluent treatment by 58% |
|---|---|
| Beschreibung: | Date Completed 23.12.2024 Date Revised 23.12.2024 published: Print Citation Status MEDLINE |
| ISSN: | 1554-7531 |
| DOI: | 10.1002/wer.11158 |