In Situ Bioreduction of Hexavalent Chromium‐Contaminated Water Using a Microbial Culture Barrier

Chromium (Cr) has been extensively used in many industrial applications. Inappropriate disposal of effluent led to increased Cr concentrations the environment. As a result, Cr(VI) classified under strict control measures by most national and international lists highly toxic materials. Bioremediation Cr(VI)-contaminated effluents appears be more economical environment-friendly treatment method. This study investigates removal bench-scale bioreactor using municipal dried sludge as permeable bioreactive barrier. The 20-cm-thick barrier with 30 % 70 sand was able achieve 95 during 90 operational days, demonstrating effectiveness biological reactive system treating Cr(VI)-containing process streams.