Combination of Alkaline and Heat Pretreatments with Zero-Valent Iron Application in Cassava Pulp and Wastewater for Methane Generation: Development from Batch to Continuous Systems

Pretreatment with the addition of metals to anaerobic digestion in biogas production is crucial address improper degradation organic compounds low methane production. Biogas from a combination cassava pulp and wastewater batch system under variation alkaline heat conditions as pretreatment was investigated zero-valent iron (ZVI) after pretreatment. It found that at pH 10 100 °C for 30 min combined 50 g ZVI kg TVS−1 showed highest up 4.18 m3 CH4 TVS−1. Nevertheless, chemical oxygen demand (COD) volatile fatty acid (VFA) removals were slightly reduced when added system. Furthermore, application continuous increased COD VFA applying pretreatments. On other hand, additional substrate pretreatments 0.58 0.90 0.19 0.24 20 60 days hydraulic retention times (HRTs), respectively. Thus, suitable essential increasing systems.