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Unveiling graphite coated with nano-nickel ferrite for two-stage gaseous biofuel generation from potato processing wastewater
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DOI：10.1016/j.biombioe.2025.107610.png)
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Abstract
En 中文
Anaerobic digestion (AD) process couples the privilege of biowaste reduction and bioenergy production. Hereby, enhancing AD of potato processing wastewater (PPW) in one-stage vs. two-stage AD process using graphite rods, 50, 100 and 200 mg g- 1 volatile solids (VS) nano-nickel ferrite and graphite rod coated with nano-nickel ferrite was explored in batch assay at mesophilic conditions (37 degrees C). Nano-nickel ferrite was prepared and systematically scrutinized using FTIR, XRD, EDX spectral analysis and scanning electron microscopy. Graphite rods coated with nano-nickel ferrite achieved the highest hydrogen (226 mL H2 g- 1 COD) and methane (320 mL CH4 g- 1 COD) yields at mesophilic conditions (37 degrees C) in two-stage AD process compared to that of the control (142 mL H2 g- 1 COD and 216 mL CH4 g- 1 COD). In addition, One-stage AD graphite rods coated with nano-nickel ferrite achieved the highest methane (280 mL CH4 g- 1 COD) yield at mesophilic conditions of all the tested conditions at one-stage AD. In addition, coating the nano-nickel ferrite on the graphite rods avoids its wash out from the system. Correspondingly, total energy recovery from PPW was increased, with the highest recovery observed in two-stage digestion using graphite rods coated with nano-nickel ferrite, reaching 7.9 x 108 kJ, which is more than 1.5 times compared to control assays. The future perspectives and practical implications of coupling biowaste reduction and bioenergy production from PPW revealed a significant opportunities in many aspects including waste management, renewable energy generation, resource recovery, and compliance with environmental regulations.
Keywords:
Hydrogen
Methane
Nanoparticles
Energy recovery
Wastewater management
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