Social benefit-cost analysis of chrome (Cr) VI-heavy metal having an important effect on deformation of ecological balance and rise of environmental pollution-removal with biological adsorption is analyzed in this study and evaluated in terms of business organization liability. Chrome removal ratios for two different types namely vegetative cell and endospor of Bacillus thuringiensis used in the biological adsorption is evaluated as cardinal utility and chemical substances used in removal and removal measurement as unit cost. The benefit of chrome VI removal to the human health and environment as unmeasured indirect utility is accepted as data and evaluated in terms of business organization liability, and quantitative data is expressed as verbally. It is determined that 18250 mg/year chrome removal in liter and 50 mg/L/day in average liter are done using either vegetative cell or endospor. Annually chemical input cost is 51.1 % when this data is evaluated. Annually benefit/cost ratio (B/C) for vegetative cell is 0.65 and 1.1 for endospor in terms of chemical input. In this case, chrome removal with endospor for business organization will become correct. When this option is evaluated in terms of business organization liability, financial benefit means chrome VI removal with low cost and environmental benefit is disposal of chrome in sewer water without damaging the environment. At the same time, other social benefit provided by business organization is that the refined water which has high refinement quality can be used for various purposes. Being risk preventive for human health makes positive effect in social responsibility. Business organization will discharge the social responsibility in terms of taking precautions for human health and protecting the environment beside financial benefit with this aspect.

Keywords: Adsorption, Cost-benefit analysis, Chrome, Social responsibility, Industrial waste water.