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Process intensification of anaerobic digestion for biohydrogen and methane production from crude glycerol and dairy wastewater using cavitation techniques
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DOI：10.1039/D5RA04093K.png)
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Abstract
En 中文
This study investigates methane production from the mono-digestion of dairy wastewater (DWW) and hydrogen production from the co-digestion of DWW and crude glycerol (CG); both of which are abundantly available in India. In this study; ultrasonication (US) and hydrodynamic cavitation (HC) were employed as pretreatment methods for DWW prior to mono and co-anaerobic digestion; with the aim of enhancing methane and hydrogen production. The results show that these methods significantly improve methane yield; offering a sustainable solution for efficient bioenergy recovery from organic waste. The highest methane yield from DWW was achieved using US at an amplitude of 60% and a treatment duration of 30 min; resulting in a maximum cumulative methane yield (Pmax) of 413 mL; with a production rate (rm) of 26.31 mL per day and a lag phase (λ) of 23.19 days. In a similar experiment; treating DWW with HC using a venturi with a 2 mm hole size; the Pmax was 341.21 mL at a pressure of 5 bar and a treatment time of 30 min. This process resulted in a rm of 24.43 mL per day and a λ of 29.74 days. Additionally; when CG was combined with DWW; the maximum cumulative hydrogen yield reached 330.8 mL at a 4% v/v concentration of CG; with rm of 45.6 mL per day and a λ of 0.69 days. At CG concentrations ranging from 0.2 to 1% v/v; both hydrogen and methane were produced. However; beyond a 1% v/v CG concentration; methane production began to decrease. It was also found that pretreatment using HC and US did not enhance hydrogen production when CG was co-digested with pretreated DWW. These findings highlight the potential of integrating US; HC; and co-digestion strategies to enhance biofuel yields; promoting sustainable waste management and renewable energy solutions.
Keywords:
methane production
hydrogen production
dairy wastewater
crude glycerol
ultrasonication
hydrodynamic cavitation
anaerobic digestion
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