Insights into organic loading rates of anaerobic digestion for biogas production: a review

Nkuna, Rosina; Roopnarain, Ashira; Rashama, Charles; Adeleke, Rasheed

doi:10.1080/07388551.2021.1942778

Cited by 26 publications

(13 citation statements)

References 177 publications

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“…However, the highest CH 4 concentration in biogas of 70.1 ± 0.7% was at the lowest OLR (Figure 7). An increase in OLR to 7.0 g COD/L•d resulted in a significant reduction in biogas and CH 4 production, the pH value dropped to 6.37 ± 0.17, while the FOS/TAC ratio increased to 0.48, which indicates the accumulation of volatile fatty acids in a reactor chamber and overloading the reactor (Table 6, Figures 6 and 7) [43,57,58]. The treatment of confectionery wastewater was also studied by Balcıo glu et al [31].…”

Section: Resultsmentioning

confidence: 99%

Methane Production from Confectionery Wastewater Treated in the Anaerobic Labyrinth-Flow Bioreactor

et al. 2023

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Production and consumption of confectionery products have increased worldwide, thus, effective management of wastewater produced is now an important issue. The confectionery high-load sewage was explored for biogas production in an innovative-design anaerobic reactor with labyrinth flow. The experimental studies were focused on determining the best technological parameters of anaerobic digestion for the effective removal of pollutants and obtaining high CH4 production efficiency. It was found that organic loading rate (OLR) of 5.0–6.0 g COD/L·d contributed to the highest CH4 generation of 94.7 ± 6.1 to 97.1 ± 5.1 L CH4/d, which corresponded to a high COD removal of 75.4 ± 1.5 to 75.0 ± 0.6%. Under such conditions the FOS/TAC ratio was below 0.4, indicating reactor stability, and pH was on the level of 7.15 ± 0.04 at OLR 5.0 g COD/L·d and 7.04 ± 0.07 at OLR 6.0 g COD/L·d.

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Section: Resultsmentioning

confidence: 99%

Methane Production from Confectionery Wastewater Treated in the Anaerobic Labyrinth-Flow Bioreactor

et al. 2023

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“…A low C/N ratio results in the formation of ammonia, whereas a high ratio results in the failure of the biogas plant. Hence, in both cases, AD failed ( Nkuna et al, 2021 ). Appropriate C/N ratio/nutrient balance is required for the proper growth of microorganisms under stable environmental conditions.…”

Section: Discussionmentioning

confidence: 99%

Microbial Pretreatment of Chicken Feather and Its Co-digestion With Rice Husk and Green Grocery Waste for Enhanced Biogas Production

et al. 2022

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To utilize wastes and residues sustainably and excellently, there is a need to fend for efficient methods and resources for biogas production. Use of poultry waste for biogas production represents one of the most important routes toward reaching global renewable energy targets. The current study involves microbial pretreatment of chicken feather waste, followed by its co-digestion with rice husk and green grocery waste in batch and continuous reactors, respectively. Microbial pretreatment of chicken feathers by keratinase secreting Pseudomonas aeruginosa was an effective and eco-friendly approach to make its recalcitrant structure available as a raw substrate for biogas production. The current study also addressed the enhancement and stability of anaerobic digestion by co-digestion. Results demonstrated that biogas production was increased by microbial pretreatment of chicken feathers and that the percentage increase in biogas yield was 1.1% in microbialy pretreated feathers compared to mono-digestion (non-pretreated feathers) in batch fermentation. The highest yield of biogas was obtained in a batch reactor having co-digestion of pretreated rice husk and microbial pretreated chicken feathers. The co-digestion of chicken feathers hydrolysate with green grocery waste in continuous fermentation mode has also enhanced the biogas yield as compared to average of mono-digestion (chicken feather hydrolysate and green grocery waste) and, therefore, improve the efficiency of the overall process.

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“…The OLR in HS-AD is approximately 10 VS/(m 3 ·d), while the LS-AD exhibits an OLR of around 5–6 kgVS/(m 3 ·d). Insufficient OLR leads to insufficient biogas production, and excessive OLR leads to organic overload and toxicity issues [ 29 ]. It is also essential to maintain the appropriate pH range (6.5–7.5) for the activity of acid-producing bacteria and methanogenic archaea [ 10 ].…”

Section: Overview Of Hs-ad and Process Designmentioning

confidence: 99%

Mass Transfer Enhancement in High-Solids Anaerobic Digestion of Organic Fraction of Municipal Solid Wastes: A Review

Gao,

Li,

Wang

et al. 2023

Bioengineering

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The increasing global population and urbanization have led to a pressing need for effective solutions to manage the organic fraction of municipal solid waste (OFMSW). High-solids anaerobic digestion (HS-AD) has garnered attention as a sustainable technology that offers reduced water demand and energy consumption, and an increased biogas production rate. However, challenges such as rheology complexities and slow mass transfer hinder its widespread application. To address these limitations, this review emphasizes the importance of process optimization and the mass transfer enhancement of HS-AD, and summarizes various strategies for enhancing mass transfer in the field of HS-AD for the OFMSW, including substrate pretreatments, mixing strategies, and the addition of biochar. Additionally, the incorporation of innovative reactor designs, substrate pretreatment, the use of advanced modeling and simulation techniques, and the novel conductive materials need to be investigated in future studies to promote a better coupling between mass transfer and methane production. This review provides support and guidance to promote HS-AD technology as a more viable solution for sustainable waste management and resource recovery.

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Insights into organic loading rates of anaerobic digestion for biogas production: a review

Cited by 26 publications

References 177 publications

Methane Production from Confectionery Wastewater Treated in the Anaerobic Labyrinth-Flow Bioreactor

Methane Production from Confectionery Wastewater Treated in the Anaerobic Labyrinth-Flow Bioreactor

Microbial Pretreatment of Chicken Feather and Its Co-digestion With Rice Husk and Green Grocery Waste for Enhanced Biogas Production

Mass Transfer Enhancement in High-Solids Anaerobic Digestion of Organic Fraction of Municipal Solid Wastes: A Review

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