Abstract
The enzymatic reduction of Cr(VI) to Cr(III) by Cr(VI) resistant bacteria followed by chemical precipitation constitutes the ChromeBac™ system. Acinetobacter haemolyticus was immobilized onto carrier material inside a 0.2m3 bioreactor. Neutralized electroplating wastewater with Cr(VI) concentration of 17–81mgL−1 was fed into the bioreactor (0.11–0.33m3h−1). Complete Cr(VI) reduction to Cr(III) was obtained immediately after the start of bioreactor operation. Together with the flocculation, coagulation and filtration, outflow concentration of less than 0.02mg Cr(VI)L−1 and 1mg total CrL−1 were always obtained. Performance of the bioreactor was not affected by fluctuations in pH (6.2–8.4), Cr(VI) (17–81mgL−1), nutrient (liquid pineapple waste, 1–20%v/v) and temperature (30–38°C). Standby periods of up to 10days can be tolerated without loss in activity. A robust yet effective biotechnology to remove chromium from wastewater is thus demonstrated.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
