effect of some bacterial isolates in bioremediation of Cadmium

Abstract

This study was conducted with the aim of applying Bioremediation technology in order to identify the efficiency of some bacterial isolates for improving the quality of wastewater discharging from a tank of Al-Hindiyah district sewage water treatment station in Karbala Governorate. The study included use of bacteria to remove heavy metals (Cd), as 120 bacterial isolates were isolated from wastewater before entering and after leaving the station under study, and it appeared that only 6 isolates of them were tolerant to high concentrations of heavy metals under study, up to 2,400 mg /L. These isolates were diagnosed with the Api20E technique and Vitek2 examination. Four isolates (A49, A35, A15, A1) belongs to the genus Serratia marcesens and the isolate A10 belongs to the genus Enterobacter aerogenes, while the isolate A32 refers to the genus Klebsiella pneumonia. The ability of these isolates was tested in a laboratory experiment in removing heavy metals Severally using the biomass of isolates, A35 isolation was characterized by achieving the highest removal rate for Cd, reaching 71.399% after 72 hours. Also, all isolates very high efficiency in removing (Cd) heavy metal from wastewater, with rates reaching 99.415% after 72 hours.