Performance Monitoring of Anaerobic Digestion at Various Organic Loading Rates of Commercial Malaysian Food Waste

Zainal, Afifi; Harun, Razif; Idrus, Syazwani

doi:10.3389/fbioe.2022.775676

Cited by 10 publications

(5 citation statements)

References 47 publications

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“…Moreover, the drop in pH value could also be attributed to the long-chain fatty acids (LCFAs) piled up in the system [ 59 ]. The sudden decrease in pH in the system causes the inhibition of the syntrophic bacteria, acetogen and methanogen, hence the unstable system [ 60 ]. The inhibition at OLR 7 g/L/day can be explained by the excess amount of substrate due to a high loading rate, causing insufficient time for hydrolysis in the CSTR reactor [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Molasses Residue on Treatment of Cow Manure in an Anaerobic Filter with Perforated Weed Membrane and a Conventional Reactor: Variations of Organic Loading and a Machine Learning Application

et al. 2023

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This study highlighted the influence of molasses residue (MR) on the anaerobic treatment of cow manure (CM) at various organic loading and mixing ratios of these two substrates. Further investigation was conducted on a model-fitting comparison between a kinetic study and an artificial neural network (ANN) using biomethane potential (BMP) test data. A continuous stirred tank reactor (CSTR) and an anaerobic filter with a perforated membrane (AF) were fed with similar substrate at the organic loading rates of (OLR) 1 to OLR 7 g/L/day. Following the inhibition signs at OLR 7 (50:50 mixing ratio), 30:70 and 70:30 ratios were applied. Both the CSTR and the AF with the co-digestion substrate (CM + MR) successfully enhanced the performance, where the CSTR resulted in higher biogas production (29 L/d), SMP (1.24 LCH4/gVSadded), and VS removal (>80%) at the optimum OLR 5 g/L/day. Likewise, the AF showed an increment of 69% for biogas production at OLR 4 g/L/day. The modified Gompertz (MG), logistic (LG), and first order (FO) were the applied kinetic models. Meanwhile, two sets of ANN models were developed, using feedforward back propagation. The FO model provided the best fit with Root Mean Square Error (RMSE) (57.204) and correlation coefficient (R2) 0.94035. Moreover, implementing the ANN algorithms resulted in 0.164 and 0.97164 for RMSE and R2, respectively. This reveals that the ANN model exhibited higher predictive accuracy, and was proven as a more robust system to control the performance and to function as a precursor in commercial applications as compared to the kinetic models. The highest projection electrical energy produced from the on-farm scale (OFS) for the AF and the CSTR was 101 kWh and 425 kWh, respectively. This investigation indicates the high potential of MR as the most suitable co-substrate in CM treatment for the enhancement of energy production and the betterment of waste management in a large-scale application.

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Section: Resultsmentioning

confidence: 99%

Influence of Molasses Residue on Treatment of Cow Manure in an Anaerobic Filter with Perforated Weed Membrane and a Conventional Reactor: Variations of Organic Loading and a Machine Learning Application

et al. 2023

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“…In addition, it can be clearly seen that biodigester 2 with 10% whey, exceeds the daily amount of biogas compared to other digesters. After day 15, it appears the maximum production of biogas, this tends to decrease; probably due to solid reduction and ammonia accumulation from protein digestion [14], given that in the last 2 weeks the addition of NaOH was not necessary and probably the ammonia provided the alkalinity to the medium; but since this a critic compound in the toxicity and inhibition of the medium [15], its high concentration inhibit the methanogenesis process. Figure 2 shows the biogas accumulation during the process of digestion to biodigesters 1, 2, 3 and 4.…”

Section: A Biogas Productionmentioning

confidence: 99%

Anaerobic Co-digestion with different concentrations of whey and cow dung in biogas production

Cieza¹,

Cruz²,

Wang³

et al. 2023

Proceedings of the 21th LACCEI International Multi-Conference for Engineering, Education and Technology (LACCEI 2023): “Leaders

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In this research, the whey potential for optimization of biogas production by anaerobic codigestion with cow dung was studied. It used a two-component multifactorialdesign, where it was studied four batch typebiodigesters of 4 liters on a laboratory scale with different whey concentrations (0%, 10%, 30%, 50%) and dilute cow dung in relation 1:1.5, each one in three replications. The experimentation was performed under temperature control of 35°C±2°C; and pH control between 6.4 to 6.9 by the addition of NaOH 3N; with an average of 7% of total solids and a holding time of 35 days. Below these conditions, the 2 nd biodigester with 10% of whey, it was the one which generate the largest amount of biogas with 37.9 liters in total; the 3 rd biodigester, with 30% of whey generates 24.2 liters of biogas;and the 4 th biodigester, with 50% of whey generates 14.5 liters. The reduction of total solids in biodigesters were 38.5%, 43.4%, 40.2% and 27.6% respectively. We used the Gompertz model, which allowed us to find high correlation grades oscillating between 86.295% y 94.268%. Therefore, it can be established, that the use of whey duplicates the biogas production until 52% and sets a limit of 30% (v/v) to obtain a good biogas production in batch-type biodigesters.

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“…In addition, Hanif et al demonstrated the viability of using household food waste, showing that a 72 kW biogas plant could be constructed to produce roughly 630,00 kWh of electricity for 500 households [15]. Further demonstrating the viability of using food waste as feedstock for biogas production in Malaysia, which is crucial for creating a circular economy, a biomethane potential test on food waste using a continuous anaerobic digestion system yields a maximum methane composition of 81% at 1.92 g COD/L [42].…”

Section: Municipal Solid Waste (Msw) Biomassmentioning

confidence: 99%

Methane Biogas Production in Malaysia: Challenge and Future Plan

Amin

Shukor

Yin

et al. 2022

International Journal of Chemical Engineering

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Biomethane is a sustainable energy that is produced from an organic and renewable resource. As the second-largest oil palm producer in the world, palm oil mill effluent (POME) is the primary source of biomethane generation in Malaysia. POME is the by-product of palm oil extraction and is extensively employed as a feedstock for the production of biomethane. Malaysia has an equatorial environment with humid and hot weather; this climate is conducive to the cultivation of numerous agricultural crops. A considerable number of agricultural wastes and residues are produced by agricultural crops, however, only 27% of them are used as fuel or to create useable products. Several publications have been published on the production of biomethane from POME; nevertheless, additional research is required on the use of other bioresources and technologies for biomethane production in Malaysia. In addition, there is a lack of comprehensive information on the future development of biomethane production in Malaysia; thus, to fill this gap, this review paper focuses on the challenges and future of Malaysia, which puts an emphasis on POME and also includes other alternative options of bioresources that can be the future feedstock for biomethane production in Malaysia. To the best of our knowledge, this is the first paper to provide a comprehensive overview of the biogas trend in Malaysia in terms of challenges and current biomethane development, as well as detailed information on a number of leading companies that are currently active in Malaysia biogas industry.

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Performance Monitoring of Anaerobic Digestion at Various Organic Loading Rates of Commercial Malaysian Food Waste

Cited by 10 publications

References 47 publications

Influence of Molasses Residue on Treatment of Cow Manure in an Anaerobic Filter with Perforated Weed Membrane and a Conventional Reactor: Variations of Organic Loading and a Machine Learning Application

Influence of Molasses Residue on Treatment of Cow Manure in an Anaerobic Filter with Perforated Weed Membrane and a Conventional Reactor: Variations of Organic Loading and a Machine Learning Application

Anaerobic Co-digestion with different concentrations of whey and cow dung in biogas production

Methane Biogas Production in Malaysia: Challenge and Future Plan

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