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Anaerobic digestion of the date palm empty fruit bunch is a promising technology for both solid waste management and biogas production. The date palm empty fruit bunch is a lignocellulosic waste that takes more time for degradation and has a low biodegradability, thus pretreatment is needed to improve anaerobic biodegradation. In this study, the substrate was pretreated with different ratios of alkali-NaOH: 6, 18 and 30% (w/w) (ratio weight of NaOH / weight of Volatile Solid) for 10 min at room temperature to evaluate the effect of high alkali concentration on the methane potential and biodegradability. The experiment was conducted in a 5 L batch reactor under mesophilic conditions (37 °C). The methane potential of the untreated substrate was 98.5 N mL/gVS. The best methane potential improvement of 104% was achieved in the treatment of 18% (w/w) (204 N mL/gVS) with a biodegradability of 50%. Besides, two kinetic models were used to fit the experimental methane potentials and to explore process parameters (Modified Gompertz and Transference function). The best fit for predicting the parameters of methane production was observed for the 18% (w/w) pretreatment using the transference function, with a maximum methane production rate of 5 N mL/gVS.d. [ABSTRACT FROM AUTHOR]

The use of anaerobic digestion (AD) technology for energy recovery from date palm leaflet waste (PLW), is attracting growing interest due to its multiple economic, social and environmental benefits. However, challenges persist in optimizing anaerobic digestion to harness its full potential for efficient methane production. This research aims to address these challenges by identifying a potent pre-treatment approach for enhancing methane generation through anaerobic digestion of palm leaflet waste (PLW) by comparing the results of thermal and ultrasound techniques. Moreover, the experimental methane production obtained from the AD of PLW was adjusted using Logistic and modified Gompertz models. This study showed that the cumulative methane productions were 2341, 1789, and 1461 Nml, respectively, in thermal, ultrasound pre-treatment, and untreated (witness). The results further conclude that by applying high ultrasonic and thermal energies, the biodegradation rate could be enhanced, leading to increased methane production. The simulated maximum of cumulative methane production for both the modified Logistic and modified Gomperz for all sorts of substrate was 1692,18 NmL and 1723,40 NmL, respectively, untreated, ultrasound, and thermal pre-treated. The findings of this study highlight the potential of innovative pre-treatment strategies to elevate anaerobic digestion's efficiency, thereby offering a sustainable solution for waste management and energy production. • The anaerobic digestion technique used for biogas production. • Ultrasonic and thermal techniques are essential to enhance the rate of biodegradation. • An increase in biodegradation leads to enhanced biogas production. • Methane production increases by supplying the high ultrasonic and thermal energies. • The thermal technique is a more efficient technique than the ultrasonic technique. [ABSTRACT FROM AUTHOR]

The aim of this research it is to show how the biogas anaerobic digestion from treatment of recycled pulp and paper wastewater industry (RPPW) can be a renewable energy. Furthermore, a kinetic study of hydrolyzed COD and productions of methane from UASB digester treating RPPW for the continuous test is established. This will allow to reduce the organic matter deposited in landfills and CO 2 emissions and to find viable solutions to minimize the environmental impact of RPPW. This study analyses the biogas products and energy recovery processes from a thermic and electric point of view from the theoretical equations. Thus, this study evaluated the performance of mesophilic methanogenic up-flow sludge blanket reactors (UASB) operating continuously in single-stage (UASB I). The maximum methane yields were 250.9 mLCH 4 /gCOD removed for UASB I, corresponding to 82.7% of the maximum theoretical energy 6.336 kJ/gCOD removed, Methanogenic potential were 4 137 928 m3CH 4 /year and electrical energy potential were 510 703 MWh/year. The kinetic study allowed us a hydrolysis rate kh = 0.04 indicates a correct simulation for the UASB digester treatment system for RPPW with an R = 99.668%. • Anaerobic treatment for RPPW by UASB digester under mesophilic conditions. • Energy generated was 6.336 kJ/gCOD removed and Electrical energy 510 703 MWh/year. • 84% COD and 48% TS were removed at an OLR of 7 g COD/L.d. • At optimal OLR was required to produce average 46 L/d CH 4. • Methane yields were 250.9 mLCH 4 /gCOD removed. [ABSTRACT FROM AUTHOR]