Investigating the effects of hospital waste on coastal areas: A suitable solution for its sanitary disposal

The purpose of this study is providing an appropriate and basic solution to prevent the mixing of hospital plastic waste, to collect the suspended and floating waste from marine environments, and to manage the floating solid waste. The method used in this research consists of four sections: library studies, field visits, and the collection and aggregation of data and information. Then, based on the existing problems, the design and construction of a safe device for infectious hospital waste was performed by vertical cutting of waste and chemical and mechanical combination of closed reactor. Different samples were selected and used to determine the appropriate composition from different compounds of sodium hydroxide with lime and sodium carbonate with lime. Also, the indicator used in microbial tests was Bacilius subtilis. The results of this study showed that the safe vertical cutting machine for infectious waste is chemically and mechanically effective according to the results of tests performed on the elimination of 98% of bacterial, fungal and infections. The rate of neutralization of bacterial contamination of total and focal coliforms and pathogens of Bacillus subtilis Salmonella and Shigella using the ratio of 30% was related to the chemical compounds of lime and sodium hydroxide, lime and sodium carbonate, respectively. Temperature, humidity and pH played an important role in the composition and effect of chemicals on shredded infectious waste. Therefore, in the designed device, the best conditions of temperature, humidity and pH were determined equal to 15 degrees Celsius, 45% and 12.5, respectively.