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3D plots of chemical parameters. COD, TOC, total nitrogen contents (N), conductivity, TVFA, TS, VS, pH, and produced volume of biogas are plotted in a 3D representation in which the permutation of all determined parameters define axis X, Y, and Z. The underlying biogas facilities are highlighted correspondingly (a). Plotting the parameters without the biogas yield and colorizing the dots according to their biogas production rate gives the second plot (b)
