Iranian Association of Chemical Engineering (IAChE) Iranian Journal of Chemical Engineering (IJChE) 1735-5397 17 4 2020 10 01 Hazards Identification and the Units Assessment of a the Water Treatment Plant Against Pathogenic and Biotoxin Threats Affecting by Physicochemical Parameters 33 48 130360 10.22034/ijche.2020.130360 EN A. Bahramian Hamedan University of Technology Journal Article 2021 05 10 <em>In this study, the inactivation performance of units against pathogenic and biotoxin threats in a water treatment plant is studied. The assessment of the units and hazards of the water treatment plant against each of threats is studied by the RAMCAP risk analysis. The experiments showed that the Aflatoxin was eliminated only by disinfection units. The reverse osmosis unit had high efficiency in removing Ricin, while the sand filtration had the lowest efficiency in removing biotoxins. The microbial analysis showed the total coliform bacteria, thermotolerant coliform and HPC index were increased slightly by increasing the incoming water's pH and turbidity, while their count were significantly reduced by increasing the free residual chlorine. Changes in the water temperature also had minor effects on microbial indexes. The RAMCAP analysis is used to reduce the vulnerability of units to conventional threats by determining </em> https://www.ijche.com/article_130360_8593eb323f2d4a627028b5448e4bae3a.pdf