Efficiency of electrohydrolysis pretreatment on terrestrial weed (Parthenium hysterophorus) to cut down the hydrolysis stage during the anaerobic digestion process and continuous reactor study

Abstract

This study’s main objective is to apply electrohydrolysis pretreatment on P. hysterophorus to reduce the hydrolysis phases and enhance biogas production. Electrohydrolysis pretreatment shows the efficiency of increasing the VFA and sCOD compared with untreated P.hystrophorous. Electrohydrolysis pretreatment at 20 V for 40 min shows the highest sCOD and VFA around (17600 ± 21 mg/L and 780 ± 24 mg/L) respectively, which is 50.17% and 33.33%. Therefore, a biochemical methane potential trial was studied for 50days, where cumulative methane yield was observed 4242 ± 17 mL CH4/g VS after pretreatment and in untreated it was observed around 3063 ± 29 mL CH4/g VS. During the compositional study, soluble lignin and cellulose increased whereas hemicellulose decreased. Morphological and structural changes were captured under FESEM, XRD and FTIR analysis after pretreatment, which found to be effective after pretreatment. During FESEM, ring-like structure was observed after pretreatment, which might be cellulose ring. In XRD study, reduction of high peak was observed. In FTIR study, broad peak after pretreatment signified the weakening of inter and intra hydrogen bond.

Keywords

• Parthenium hysterophorus
• Electrohydrolysis
• Pretreatment
• Lignocellulose
• Hydrolysis