Can you please explain the two graphs and what is dpf and pf ? .. can you explain all the symbols used

reactor d=0 to 0.2 d = 0.2 to 0.4 Observe: In conventional plug-flow activated sludge basins; In dispersed plug-flow activated sludge reactor basins; In completely mixed activated sludge reactor basins; d= 0.4 to 2 In oxidation ponds; d = o.1 to 2.0 Examples of how PFD performance can be expressed : 30 D = t (mixed flow AL First order 16 kr = 50 10 J10 -0.25 10.0625 0 (plug flow) al 1 0.01 0.1 1-XA = CACAO 3d-4 completed Figure 4-26 Values of kr in the Wehner and Wilhelm equation [Eq. (4-100)] versus percent remaining for various dispersion factors and first order kinetics. After Thirumurthi, 1969.) 6 d = 0.25 de 0.5 now 5 d=0.1 de 0.0625 Value of kr Plug how de o ZY 3 2 2 3 4 40 60 6 8 10 20 Percent remaining, C/Co