20.500.12556/DKUM-97550 Characterisation of the physical and rheological properties of evaporation products in a thermally integrated treatment of pharmaceutical wastewaters Pharmaceutical wastewater streams contain elevated concentrations of sulphates, nitrogen species and organic impurities, making them challenging to treat with conventional methods. The present study evaluates an inte grated treatment strategy of vacuum evaporation, electrocoagulation and lime precipitation, with the emphasis on thermal performance and compatibility with low-grade industrial waste heat. A pilot-scale vacuum evapo ration trial was conducted at pressures ranging from 50 to 150 mbar. It was ascertained that an optimum pressure of 50 mbar was conducive to effective coupling with on-site waste-heat sources, with temperatures around 60 ◦ C. In the given conditions, the following outcomes were achieved: stable boiling behaviour, effective heat transfer and a volume reduction of up to 90 %. However, these outcomes were followed by a sharp increase in viscosity. The distillates demonstrated close to water-like physical properties and a maximum chemical oxygen demand reduction of 98.0 %, while the concentrates exhibited significant boiling-point elevation and rheological transitions at elevated levels of solids‘ content. Electrocoagulation has been demonstrated to remove up to 67.9 % of sulphates, and the addition of lime has been shown to increase the total removal to 75.0 %. The findings indicate that a thermally integrated, multi-stage approach can lead to substantial reductions in pollutant loads, the recovery of high-quality water and a decrease in waste volumes. This provides a promising basis for scaling to multi-effect systems, and for implementing energy-efficient, circular wastewater management in pharmaceutical production. pharmaceutical industry waste stream vacuum evaporation electrocoagulation line precipitation heat integration farmacevtska industrija elektrokoagulacija integracija toplote true false true Elsevier Ltd. Angleški jezik Slovenski jezik https://www.sciencedirect.com/journal/thermal-science-and-engineering-progress © 2026 The Author(s). Članek v reviji 2026-03-18 16:19:32 2026-03-18 16:19:33 2026-03-19 04:02:30 0000-00-00 00:00:00 2026 0 0 12 str. [article no.] ǂ104624 Vol. 73 May 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-12-16 2026-03-06 2026-03-11 620.9 271827459 10.1016/j.tsep.2026.104624 2451-9049 1-s2.0-S2451904926001502-main.pdf 1-s2.0-S2451904926001502-main.pdf 1 D58C8C1816CF78E2CBE7997CB654037A e6177397fee2b21e60dfeba248cf6f8c9edaded4ff1efc1b32fd16e6bba639c2 7562017d-22de-11f1-b351-00155d0001a1 https://dk.um.si/Dokument.php?lang=slv&id=204634 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0