Anaerobic Digestion of Napier Grass (Pennisetum purpureum) in Two-Phase Dry Digestion System Versus Wet Digestion System

Thaemngoen, Amornpan; Saritpongteeraka, Kanyarat; Leu, Shao Yuan; Phuttaro, Chettaphong; Sawatdeenarunat, Chayanon; Chaiprapat, Sumate

doi:10.1007/s12155-020-10110-1

Cited by 24 publications

(14 citation statements)

References 42 publications

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“…Lastly, the thermophilic acidogenesis stage of the 2-stage AD of palm oil mill effluent had the proper VFA/ALK ratios between 1.59 -2.49 [24]. But this work was near the acid production in the leach bed reactor (LBR) of AD of napier grass with the ratio of VFA/ALK at 3.0 [25]. Since the SS substrate consisted of much glucose, it looks like in the napier grass comprising mainly cellulose and hemicellulose that could convert into many glucoses and other sugar monomers [26].…”

Section: (B))mentioning

confidence: 86%

Study on the Potential Use of Modified Tapioca Starch Sludge Waste for Volatile Fatty Acid Generation

et al. 2022

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Starch sludge (SS) is a bulky main waste from modified tapioca starch production, a high potential substrate for alternative volatile fatty acids (VFA) production. Because it has relatively high organic content in SS is easy and fast to convert into VFA. However, there are limitations when fed overloading rate to anaerobic digestion (AD) system affecting the VFA production yield and system performance. This research aims to study the effect of initial feeding concentrations of SS between 0.5 and 2.5 % total volatile solids (TVS) on the VFA production efficiency by applying a batch continuously stirred tank reactor (CSTR) for digestion. The maximum VFA yield was 115 mg VFA/g TVS at a feeding rate of 2.0 % TVS of SS after 4 days of digestion. The digestion system could run under proper system performance and stability by showing higher pH. Besides, acetic acid was the predominant VFA intermediate indicating great effective digestion. Finally, the main bacteria in the inoculum were Arenimonas up to 33 % because it preferred to grow on glucose. And inoculum obtained from the beverage plant’s wastewater treatment system. These were so useful to select the inoculum for organic starch digestion.

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Section: (B))mentioning

confidence: 86%

Study on the Potential Use of Modified Tapioca Starch Sludge Waste for Volatile Fatty Acid Generation

et al. 2022

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“…Thaemngoen et al [9] also studied a two-phase configuration system to treat Napier grass (Pennisetum purpureum), but in this case, compared the process performance with conventional wet digestion. Continuous leachate spraying from the methanogenic reactor promoted hydrolysis and prevented inhibitory conditions, but the system attained a methane yield for this substrate of 0.069 L CH 4 /g VS, against a value obtained from biochemical methane potential (BMP) tests of 0.227 L CH 4 /g VS and 0.158 L CH 4 /g VS from a wet digestion reactor at an OLR of 4 g VS/Lr d.…”

Section: Operating Conditions and Leachate Bed Configurationmentioning

confidence: 99%

“…Wet digestion, on the other hand, is easier to operate. The feeding material needs to be diluted with water to attain a desired solid content to prevent clogging or dense scum formation in the reactor liquor, which would otherwise lead to deficiencies in mixing and in biogas generation [9]. The increase in the feeding solid content has a marked impact on waste rheology and, therefore, on the equipment needed for transporting and mixing the liquor inside the reactor.…”

Section: Introductionmentioning

confidence: 99%

High-Solid Anaerobic Digestion: Reviewing Strategies for Increasing Reactor Performance

et al. 2021

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High-solid and solid-state anaerobic digestion are technologies capable of achieving high reactor productivity. The high organic load admissible for this type of configuration makes these technologies an ideal ally in the conversion of waste into bioenergy. However, there are still several factors associated with these technologies that result in low performance. The economic model based on a linear approach is unsustainable, and changes leading to the development of a low-carbon model with a high degree of circularity are necessary. Digestion technology may represent a key driver leading these changes but it is undeniable that the profitability of these plants needs to be increased. In the present review, the digestion process under high-solid-content configurations is analyzed and the different strategies for increasing reactor productivity that have been studied in recent years are described. Percolating reactor configurations and the use of low-cost adsorbents, nanoparticles and micro-aeration seem the most suitable approaches to increase volumetric production and reduce initial capital investment costs.

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“…pH had dropped considerably during the first five days can be ascribed that the rate of acidogenesis, a conversion of soluble organics to VFAs, is typically much faster than methanogenesis in an anaerobic environment. VFAs could not be utilized by methanogens adapted to the environment slowly and weak metabolic capacity, resulting in the accumulation of fatty acids [15]. Thus, this phenomenon is inevitable.…”

Section: Influence On the Ph Value And Vfa Contentmentioning

confidence: 99%

Investigation of the Effect of Compaction on the Anaerobic Digestion Process

Chen

Cao

Fan

et al. 2021

Preprint

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This paper aims to evaluate the effects of compaction on the anaerobic biodegradability of straw. In the study, compaction tests were carried out at different applied pressures, i.e., 0 (CK), 277 (T1), 555 (T2), and 1109 Pa (T3), respectively. The changes in physicochemical indicators (i.e., pH, VFA, COD, and DHA) of the liquid digestate were monitored. Factor analysis was adopted to analyze biogas production's main factors in the bath Anaerobic digestion (AD) process. Changes in the surface structures and composition of solid digestate were analyzed. The results showed that the maximum gain in biogas production was 298.35mL·g− 1TS for the T2 reactor, significantly higher than that of CK and T3 reactors. The effect of compaction on the physicochemical index of liquid digestate was not significant during the batch-type AD process. The factor analysis results suggested that the major factors affecting biogas production were influenced by the compaction and varied based on the different stages of digestion. Scanning electron microscopy (SEM) showed that the straw surface was damaged as the compaction increases; however, the degree of damage was not significant. This research concluded that compaction on gas production via changing the environment during the bath AD process and proper compaction could positively affect biogas' yield, while excessive compaction will inhibit gas production.

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Anaerobic Digestion of Napier Grass (Pennisetum purpureum) in Two-Phase Dry Digestion System Versus Wet Digestion System

Cited by 24 publications

References 42 publications

Study on the Potential Use of Modified Tapioca Starch Sludge Waste for Volatile Fatty Acid Generation

Study on the Potential Use of Modified Tapioca Starch Sludge Waste for Volatile Fatty Acid Generation

High-Solid Anaerobic Digestion: Reviewing Strategies for Increasing Reactor Performance

Investigation of the Effect of Compaction on the Anaerobic Digestion Process

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