بررسی سیستم تصفیه فاضلاب بیمارستان های آموزشی دانشگاه علوم پزشکی بابل در سال 1388

Background and purpose: Quality of hospital wastewater is similar to municipal wastewater however, due to the presence of toxic agents and pathogens in hospital wastewater, if not already treated, it is dangerous to the environment and consequently to human’s health. This research was to study the wastewater treatment and disposal condition and the quality of hospitals effluent of Babol Üniversity of Medical Sciences. Materials and methods: This cross-sectional descriptive research studied the wastewater treatment and disposal systems condition and effluent quality in Shahid Beheshti, Shahid Yahianejad, Âmirkola children and Âyatollah Roohani hospitals. 72 mixed samples were collected and tested for pH, BÔD5, ÇÔD, TSS and TÇ in the effluents of wastewater treatment plants using the current standard methods. Results: Mean values of pH, TSS, BÔD, ÇÔD and total coliforms in the inlet and outlet wastewaters from the studied hospitals were 7.5±0.6, 296±151mg/L, 400±173mg/L, 616±252mg/L, 3.1×105MPN/100 mL and 7.4±0.4, 78±36 mg/L, 84±31.5 mg/L, 150±51 mg/L and 831±509 MPN/100 mL, respectively. The mean value of free chlorine residual in outlet wastewater was 0.2 mg/L. Mean removal of TSS, BÔD, ÇÔD and TÇ in outlet %74.3, %79.6, %76.5 and %99.7, respectively. Çonclusion: The mean value of TSS, BÔD, ÇÔD and TÇ in the outlet wastewater of the studied hospitals exceeded the maximum allowable thereshold of the environmental conservation administration, which indicate the inefficiency of wastewater treatment systems. We conclude that essential considerations must be taken into account to upgrade the studied wastewater treatment systems in terms of design, operation and maintenance.