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The article considers the problem of neutralization of acidic wastewater generated during the regeneration of cation exchange filters at the Novo-Salavatskaya CHPP. The initial wastewater has a pH of 1.3 and a sulfate content of 11.6 g/dm³. The aim of the work is to develop a technological scheme and neutralization modes that allow obtaining two by-products: alabaster and manganese concentrate. The methods used include potentiometric pH determination, complexometric titration for calcium, and turbidimetry for sulfates. The experiment included two stages: precipitation of calcium sulfate with a 10% CaCl₂ solution and subsequent neutralization of the filtrate in a column packed with carbonate manganese ore. It was found that the optimal solution feed rate through the column is 4.57 cm³/min, at which the pH rises to 6.75 and the sulfate content decreases to 2.15 g/dm³. The CaSO₄ precipitate after calcination at 170–180 °C is converted into alabaster with a yield of 4.6 g per 1 dm³ of wastewater. The insoluble residue of the ore is enriched in MnO₂ up to 34–36% and can be used as a manganese concentrate. It is concluded that the proposed two-stage scheme makes it possible to abandon expensive alkaline reagents and obtain two marketable products.
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2. Petrushchenko V.V. Analysis of the performance indicators of the PGU-410t unit of the Novo-Salavatskaya CHPP under variable conditions. Science in modern society: regularities and development trends: Collection. 2022. P. 79 – 84.
3. Yatskov M. Development of a resource-saving technology for the treatment of wastewater containing iron during etching. East European Journal of Entrepreneurial Technologies. 2022. T. 6. No. 10. P. 120 – 125.
4. Bao H., Meng X., Wu M., Sun W. A review of technologies and mechanisms for the removal and recovery of manganese from mining and metallurgical wastewater. Journal of Water Process Engineering. 2025. Vol. 72. Art. No. 107894. DOI: 10.1016/j.jwpe.2025.107894
5. Chatla A., Almanassra I.W., Abushawish A., Laoui T., Alawadhi H., Atieh M. A., Ghaffour N. Sulphate removal from aqueous solutions: State-of-the-art technologies and future research trends. Desalination. 2023. Vol. 558. Art. No. 116615.
6. Dagan-Jaldety C., Lahav O., Ben-Asher R., Saller G., Oz S., Nativ P. Innovative ammonia harvesting from wastewater: A controlled closed-loop process at high pH for enhanced nutrient recovery. Chemical Engineering Journal. 2025. Vol. 503. Art. No. 158201.
7. Deng L., Zhang Y., Chen F., Cao S., You S., Liu Y., Zhang Y. Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime. Chinese Journal of Chemical Engineering. 2013. Vol. 21. No. 11. P. 1303 – 1312.
8. Dube V., Phiri Z., Kuvarega A.T., Mamba B.B., de Kock L.-A. Exploring acid mine drainage treat-ment through adsorption: a bibliometric analysis. Environmental Science and Pollution Research. 2024. Vol. 31. No. 50. P. 59659 – 59680.
9. Ekawati E., Pradipta J., Yulia E. Automation system architecture of pH neutralization process in batik wastewater treatment plant. Journal of Physics: Conference Series. IOP Publishing, 2023. Vol. 2673. No. 1. P. 012020.
10. Holtman G.A., Haldenwang R., Welz P.J. Calcite dissolution and bioneutralization of acidic wastewater in biosand reactors. Water. 2022. Vol. 14. No. 21. P. 3482.
11. Huang X., Chen T., Pan M. Treatment of coking wastewater using manganese and magnesium ores. Journal of Hazardous Materials. 2009. Vol. 168. No. 2-3. P. 843 – 847.
12. Jarnerud T., Karasev A.V., Jönsson P.G. Neutralization of acidic wastewater from a steel plant by us-ing CaO-containing waste materials from pulp and paper industries. Materials. 2021. Vol. 14. No. 10. P. 2653 – 2658.
13. Kharko P.A., Danilov A.S. Evaluation of the effectiveness of neutralization and purification of acid-ic waters from metals with ash when using alternative fuels from municipal waste. Notes of the Mining Institute. 2025. No. 274 P. 167 – 176.
14. Kim J.-E., Ji W. H. Evaluation of characteristics of sludge generated from active treatment system of mine drainage. Economic and Environmental Geology. 2023. Vol. 56.No. 4. P. 409 – 419.
15. Li B., Shu J., Wu Y., Su P., Yang Y., Chen M., Liu R., Liu Z. Enhanced removal of Mn²⁺ and NH₄⁺-N in electrolytic manganese residue leachate by electrochemical and modified phosphate ore flotation tailings. Separation and Purification Technology. 2022. Vol. 291. Art. No. 120959.
16. Monat L., Zhang W., Jarošíková A., Haung H., Bernstein R., Nir O. Circular process for phosphoric acid plant wastewater facilitated by selective electrodialysis. ACS Sustainable Chemistry and Engineering. 2022. Vol. 10.No. 35. P. 11567 – 11576.
17. Roulia M., Alexopoulos D., Itskos G., Vasilatos C. Lignite fly ash utilization for acid mine drainage neutralization and clean-up. Cleaner Materials. 2022. Vol. 6. Art. No. 100142.
18. Virpiranta H., Leiviskä T., Taskila S., Tanskanen J. Bioregeneration of sulfate-laden anion exchange resin. Water Research. 2022. Vol. 224. P. 119110.
19. Weber P., Thomas J., Skinner W., Smart R. A methodology to determine the acid-neutralization ca-pacity of rock samples. Canadian Mineralogist. 2005. Vol. 43.No. 4. P. 1183 – 1192.
20. Zhang C., Du R., Wang R., Sun W., Luo Y., Yu Z. Technological advances and sustainable strategies for electrolytic manganese wastewater treatment: A critical review. Process Safety and Environmental Pro-tection. 2025. Vol. 197. Art. No. 107274.
Oparina F.R., Yanberdin A.Z. Development of technological solutions for neutralization of acidic wastewater. Chemical Bulletin. 2026. 9 (3). 5. https://doi.org/10.58224/2619-0575-2026-9-3-5