Figure 4.
The concept of one/two-steps hydrolysis model based on the original (a) vs. the modified (Activated Sludge Model No 2d) ASM2d that was proposed by Drewnowski and Makinia [26] (b) and verified by Makinia and Czerwionka [39], as well as by Maruéjouls et al. [47], depending on chemical oxygen demand (COD) forms/molecule size. Note: More details regarding the two-step hydrolysis might be found in Table S1 in Supplementary Materials.
