Sewage sludge accumulating at treatment facilities is aqueous suspensions separated from wastewater during treatment processes. Untreated sludge has been discharged for decades into overloaded sludge beds, dumps, or quarries, leading to environmental safety violations and deteriorating people living conditions. Due to a high content of colloidal substances, sludge poorly releases water. An important step in sludge disposal is dewatering, which significantly reduces sludge volume. Factors such as moisture content, the ratio of free to bound water, the degree of dispersion of solid phase particles, chemical composition, structure, and viscosity significantly influence sludge dewatering. The compressibility of sewage sludge under external pressure is one of its characteristic properties. Modeling was carried out using the method of linear proportions, which allowed the derivation of a uniform functional dependence under different combinations of similarity numbers.
- Foladori, P., Andreottola, G. & Ziglio, G. (2010) Sludge reduction technologies in wastewater treatment plants. IWA publishing. https://doi.org/10.2166/9781780401706
- Gahlot, P., Balasundaram, G., Tyagi, V. K., Atabani, A. E., Suthar, S., Kazmi, A. A., Štěpanec, L., Juchelková, D. & Kumar, A. (2022) Principles and potential of thermal hydrolysis of sewage sludge to enhance anaerobic digestion. Environmental Research, 214, 113856. https://doi.org/10.1016/j.envres.2022.113856
- Hušek, M., Moško, J., & Pohořelý, M. (2022) Sewage sludge treatment methods and P-recovery possibilities: Current state-of-the-art. Journal of Environmental Management, 315, 115090. https://doi.org/10.1016/j.jenvman.2022.115090
- Zhang, X., Ye, P. & Wu, Y. (2022) Enhanced technology for sewage sludge advanced dewatering from an engineering practice perspective: A review. Journal of Environmental Management, 321, 115938. https://doi.org/10.1016/j.jenvman.2022.115938
- Jiang, Y., Gao, F., Zhang, N., Li, J., Xu, M. & Jiang, Y. (2023) Dehydration performance of municipal sludge and its dewatering conditioning methods: a review. Industrial & Engineering Chemistry Research, 62(29), 11337–11357. https://doi.org/10.1021/acs.iecr.3c01553
- Skinner, S. J., Studer, L. J., Dixon, D. R., Hillis, P., Rees, C. A., Wall, R. C., Cavalida, R. G., Usher, S. P., Stickland, A. D. & Scales, P. J. (2015) Quantification of wastewater sludge dewatering. Water Research 82, 2–13. https://doi.org/10.1016/j.watres.2015.04.045.
- Wójcik, M. & Stachowicz, F. (2019) Influence of physical, chemical and dual sewage sludge conditioning methods on the dewatering efficiency. Powder Technology 344, 96102. https://doi.org/10.1016/j.powtec.2018.12.001
- To, V. H. P., Nguyen, T. V., Vigneswaran, S. & Ngo, H. H. (2016) A review on sludge dewatering indices. Water science and technology, 74(1), 1–16. https://doi.org/10.2166/wst.2016.102
- Wu, B., Dai, X. & Chai, X. (2020) Critical review on dewatering of sewage sludge: influential mechanism, conditioning technologies and implications to sludge re-utilizations. Water Research 180, 115912. https://doi.org/10.1016/j.watres.2020.115912.
- Wei, H., Gao, B., Ren, J., Li, A. & Yang, H. (2018) Coagulation/flocculation in dewatering of sludge: a review. Water research, 143, 608-631. https://doi.org/10.1016/j.watres.2018.07.029
- Lau, S. W., Sen, T. K., Chua, H. B. & Ang, H. M. (2017) Conditioning of synthetic sludge and anaerobically digested sludge using chitosan, organic polyelectrolytes and inorganic metal cations to enhance sludge dewaterability. Water, Air, & Soil Pollution, 228, 1–13. https://doi.org/10.1007/s11270-017-3545-8
- Fu, Q., Liu, X., Wu, Y., Wang, D., Xu, Q. & Yang, J. (2021) The fate and impact of coagulants/flocculants in sludge treatment systems. Environmental Science: Water Research & Technology, 7(8), 1387–1401. https://doi.org/10.1039/D1EW00165E
- Liu, H., Wang, X., Qin, S., Lai, W., Yang, X., Xu, S. & Lichtfouse, E. (2021) Comprehensive role of thermal combined ultrasonic pre-treatment in sewage sludge disposal. Science of the Total Environment, 789, 147862. https://doi.org/10.1016/j.scitotenv.2021.147862
- Lo, K. V., Srinivasan, A., Liao, P. H. & Bailey, S. (2015) Microwave oxidation treatment of sewage sludge. Journal of Environmental Science and Health, Part A, 50(8), 882–889. https://doi.org/10.1080/10934529.2015.1019811
- Verbovskyi, O., Zhuk, V., Orel, V. & Popadiuk, I. (2023) Optimization of the process of decreasing the filtration resistance of sewage sludge by thermal pretreatment: a case study for the Lviv WWTP. Water Science & Technology, 88(7), 1688–1698. https://doi.org/10.2166/wst.2023.317
- Bień, B. (2018) The impact of coagulant PIX 113 modified by ultrasonic field on sewage sludge dewatering. Desalination and Water Treatment, 117, 175–180. https://doi.org/10.5004/dwt.2018.22192
- Verbovskyі, O. V. & Davydchak, O. R. (2009) Filtration and compression characteristics of sewage sludge // Environmental protection. Energy saving. Balanced nature management: collection of materials of the I international congress, Lviv, June 28–29 / Lviv: Publishing House of the Lviv Polytechnic National University, 117–118. (in Ukrainian).
- Verbovskyі O. V., Sibirny A. V. & Regush A. Ya (2008) Kinetics of sewage sludge dehydration // Bulletin of the Lviv State University of Life Safety. No. 2. 135–139. (in Ukrainian).
- Mikhalev, M. A. (2010) Physical modeling of hydraulic phenomena: a textbook. – St. Petersburg: Polytechnic University Publishing House. (in Russian).
- Kepych, T. Yu., Kutsenko, O. G. (2004) Fundamentals of similarity theory and dimensional analysis and their application in problems of mechanics: Textbook. – Kyiv: Taras Shevchenko National University. (in Ukrainian).
- Minakovskyі, V. M. (1978) Generalized variables of transport theory (fundamentals of theory and reference tables). – Kyiv: Higher School. (in Russian).
- Naumenko, I. I. (2005) Hydraulics. Textbook. – Rivne: National University of Water and Environmental Engineering. (in Ukrainian).