Figure 9.30 shows a chlorine feed system at a water treatment plant. What is required between the chlorine feeding cylinders and the chlorine feed points? The same figure also shows that one chlorine...

Figure 9.30 shows a chlorine feed system at a water treatment plant. What is required between the chlorine feeding cylinders and the chlorine feed points? The same figure also shows that one chlorine cylinder feeds chlorine to the influent water before chemical flocculation, and another chlorine cylinder feeds chlorine to the effluent from the filter. What are the technical terms of this chlorination system for cross-connection control? Can one chlorine cylinder be used to feed both the influent to the flocculation influent and the filter effluent? Please explain.

Figure 9.30