Objectives In this research. individual toxicity evaluation of heavy metals (Hg2+. Cr6+. Cd2+) was performed using a semi-continuous type bioreactor based on changes in the activity of sulfur oxidizing bacteria(SOB). https://www.markbroyard.com/save-big-quest-mv40-gas-floor-fryer-40-lb-casters-natural-gas-discount-best-mega/