Stock Tank Mixing Spring 2011OverviewThe Spring 2011 Stock Tank Mixing Team is tasked with improving working to improve the current stock tank mixing system that is currently being implemented within in Honduran AguaClara plants. We are currently running experiments with It is part of the team's responsibility is to research the properties of aluminum sulfate (alum) , and polyaluminum chloride (PACl) , and water. The team's objectives include determining the range of acceptable concentrations the stock solution can be, analyzing and improving the efficiency of the existing mixing system, and designing a new mixing system for use on future plants. Thus far, we have conducted experiments testing different ranges of concentrations with alum, designed several types of mixing systems, and begun small scale testing one of the mixing system designs.coagulants such as density and dissolution properties. The team has thus far conducted alum experiments such as the "double bucket" idea and the "upflow" experiments to find ways to completely dissolve the alum. For PACl, the team is experimenting with homogeneous mixing and uses the "worst case scenario" setup to conduct experiments. We have quantified the inefficiency of stick ("simple stirrer") mixing and have developed the centrifugal pump mixer as a possible future mixer for AguaClara plants. | 
