1) Ignore data reported for December 2012. From Figure S1, determine the estimated average log removal rates (LRV) for heterotrophic bacteria that were obtained by the following stages: Coagulation + clarification + coal-sand filter

Assignment 2

Read this peer-reviewed research paper, published in Journal of Environmental Sciences:  Attached

Please pay attention to Figure 1 where they described the schematic of the drinking water treatment process, and provided the definition of RW, SE, CE and FW.

Also see the Appendix A  (Supplementary) attached : Supplementary Data. Please refer to Figure S1, and answer the following questions:

1)     
Ignore data reported for December 2012. From Figure S1, determine the estimated average log removal rates (LRV) for heterotrophic bacteria that were obtained by the following stages:

–         
Coagulation + clarification + coal-sand filter

–         
Granular activated carbon

–         
Chlorination + Monochloramine

Please provide the step-by-step calculations for each stage.

2)     
Ignore data reported for December 2012. From Figure S1, determine the estimated average log removal rates (LRV) for total cells that were obtained by the following stages:

–         
Coagulation + clarification + coal-sand filter

–         
Granular activated carbon

–         
Chlorination + Monochloramine

Please provide the step-by-step calculations for each stage.

3)     
Based on the data obtained above from part 1 and 2, please state which process is the most efficient for removing heterotrophic bacteria and total cells.

4)     
Based on the data obtained above from part 1 and 2, why do you think there are differences in the magnitude of LRV of HPC and that of total cells reported for the last stage (chlorine + monochloramine)?