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Abdolrahman Gharanjic, Ramazan Ali Dianati Tilaki, Samaneh Dehghan, Abutaleb Bay, Fathollah Gholami-Borujeni,
Volume 18, Issue 2 (9-2025)
Abstract

Background and Objective: Proper operation and maintenance of hospital waste sterilization devices are crucial for preventing the spread of infections and hazardous diseases, as well as for safeguarding public health and the environment. This study aims to assess the operational and maintenance status of medical waste sterilization devices in public and private hospitals in Golestan Province.
Materials and Methods: This descriptive-analytical study was conducted in 17 public and 6 private hospitals in Golestan Province, all of which were equipped with vacuum steam autoclaves (without shredders) for medical waste sterilization. Monthly microbiological sampling was performed by an accredited environmental laboratory. Data were collected using standardized questionnaires and personal interviews, with results analyzed using frequency distributions, percentages, and central tendency measures.
Results: The overall microbial sterilization performance of the devices was 97.07%, indicating high efficacy in waste treatment. When comparing hospital types, public hospitals demonstrated a 96.93% satisfactory sterilization rate, while private hospitals performed slightly better at 97.22%. Regarding preventive maintenance, compliance was suboptimal, with public hospitals adhering to maintenance protocols 68.62% of the time, compared to 77.77% in private hospitals. Additionally, the sanitary conditions of sterilization device locations met required standards in 94.11% of public hospitals but only 69.05% of private hospitals, suggesting variability in facility upkeep.
Conclusion: To ensure device effectiveness and minimize risks in hospital waste management, implementing preventive maintenance programs and providing continuous staff training on proper device use are essential.
 

Ramazanali Dianati Tilaki, Roghayeh Kaseb, Esmaeil Babanejad Arimi, Mohammad Dianati,
Volume 18, Issue 3 (12-2025)
Abstract

Background and Objective: Benzene is a carcinogenic volatile organic compound commonly found in polluted air. This study aimed to remove benzene from air using a TiO₂–Bi2O₃ composite photocatalyst immobilized on glass foam under ultraviolet (UV) light irradiation.
Materials and Methods:
Glass foam coated with the TiO₂– Bi2O₃composite was placed in a quartz reactor, which was connected to an air pump inside a sealed glass chamber. A UV lamp (254 nm) was installed next to the reactor. Known volumes (µL) of benzene were injected into the chamber through a septum. When the pump was activated, benzene-contaminated air passed through the photoreactor. Benzene concentration was measured by collecting air samples from the chamber and analyzing them using a GC-FID device.

Results: XRD spectra and SEM images confirmed the presence of TiO₂ and Bi2O₃, while BET analysis verified the mesoporous structure of the composite photocatalyst. The surface adsorption of benzene by the composite was 15% and followed the Langmuir model. The process kinetics were first-order, and the removal efficiency decreased with increasing benzene concentration. At a benzene concentration of 39 ppm, the removal efficiency after 75 minutes of TiO₂ and UV irradiation was 75%, whereas for TiO₂– Bi2O₃ under similar conditions, the efficiency increased to approximately 90%.
Conclusion: Using a TiO₂– Bi2O₃ composite photocatalyst under UV-A irradiation improved benzene removal efficiency by about 15% compared with TiO₂alone.
 


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