Process simulation and cost estimation of treatment of chromium-containingleather waste

Our laboratory has developed two processes to treat chrome shavings, from w hich protein products and a recyclable chrome cake are isolated. Because of interest from the industry, the authors now describe the estimation of cos ts of the process. Due to the many variables that will have an influence on the cost of the process, we are giving a model for those who would like to estimate their cases of the process. The ultimate cost evaluation must be calculated by each of the readers, and will depend on the geographical situ ation, the origin of the chrome shavings and the final disposition of the p rotein and recycled chrome. As will be discussed, other factors enter into this evaluation, such as labor cost, machinery source and use, chemicals co st, and more important, use of the protein.