Anaerobic Digestion Of Pretreated Lignocellulosic Biomass With Biowaste For Enhancing Biomethane Production

Reducing the recalcitrant characteristics of lignocellulosic biomass by different pretreatments and conditionings are approach for full-scale biofuel production, resolving environmental issues, and waste utilization. This study unveiled five different pretreatments method to enhance the digestibility of lignocellulosic straw for methane production. Firstly, steam explosion (SE)pretreatment modification the lignocellulosic components (hemicellulose and lignin) the of corn stover (CS) and rice straw (RS) significantly improved methane yield of 40.0% and 62.7% compared to untreated. Secondly, 1.0% KOH treated RS and 1.5% KOH treated CS were effectively delignified as well improved methane yield very significantly up to 27.2% and 49.9%, respectively compared to untreated.Thirdly, 1.5% KOH solution's black liquor (spent liquor of KOH) (BL) pretreated CS effectively by removing lignin and enhanced the CS anaerobic digestibility. No significant difference in weighted average methane content of experimental methane and biogas yields between BL-treated and original KOH-treated CS after anaerobic digestion (AD). The BL process significantly increased the overall methane yield up to 52.4% compared with untreated CS, whereas no significant difference between the overall methane yields of 1.5% KOH-treated and BL-treated CS was observed. Fourthly, thermal potassium hydroxide (KOH-60?)pretreatment enhancement the lignin removal of CS and significantly improved methane yield up to 56.4% compared to untreated. Fifthly, copretreatment of thermal potassium hydroxide and steam explosion (CPTPS) effectively removal the lignin content and increased the crystallinity index of CS among all pretreatments and improved 88.5% methane yield compared with untreated.Besides, KOH treated RS was codigested with chicken manure (CM) and food waste (FW). Codigestion of KOH-treated RS with FW and CM significantly improved methane yield 7.3% and 34.0%, respectively by enhancing the buffer capacity as compared to mono-digestion of FW or CM. Codigestion of 1.0% KOH-treated RS with CM synergizes up to 3.4 mL/g VS. While Codigestion of 1.0%KOH-treated RS with FW synergizes up to 63.9 mL/g VS. Maximum synergism was observed of 1.0% KOH-treated RS with FW due to nutrients balance. Different kinetics models very well simulated dynamics of methane production yield of untreated, SE-treated, KOH-treated, thermal potassium hydroxide (KOH-60?)treated, CPTPS-treated, BL-treated and codigested. Furthermore, alteration of physico-chemical complex features of pretreated straw was well explained by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), scanning electron microscopy and energy dispersive X-ray's Spectrometry (SEM-EDS) for comparative evaluation for further improvement. Our collective information suggested that pretreatment could significantly overcome the lignocellulosic recalcitrance properties and enhance the methane yield. Results implied that this might be a real-world approach to making the waste valuable in future.