**3. Results and Discussion**

In this section, results and discussion regarding the characterization of feedstock materials and pretreatment analysis are presented. First, results for the liquid phase are shown in Sections 3.2.1–3.2.4 (NPK, TOC, C/N ratio, COD, pH and conductivity) and results for the gas phase are presented in Section 3.2.5 (concentrations of CH4, CO2 and H2S).
