pH and Heat Pretreatments with Zero-Valent Iron Addition to Enhance Biogas Production from Cassava Pulp Wastewater: Optimization and Comparison of Mathematical Models

Pretreatments of pH and heat with zero-valent iron (ZVI) additions enhance anaerobic digestion increase reducing sugar availability for optimum biogas production. This study aimed to optimize the conditions different pretreatment additional ZVI yield higher amounts from (AD) cassava wastewater. Thirteen conditions, ten concentrations, eleven heating periods were varied measured standard conditions. Four mathematical models that are widely used evaluate cumulative production employed, namely, Modified Gompertz, Logistic, Transference, Exponential models. The 10 35 min boiling time a concentration 60 g·kg·TVS−1 produced highest at end AD process. Logistic Gompertz better fitted experimental data than other Interestingly, optimized altered rate but prolonged lag phase. A reasonably positive correlation was also found between FeOOH amount in LF MG These optimal models, kinetics parameters, possible correlations novel findings can help develop extensive scale developments generation