Enhanced volatile fatty acids accumulation in anaerobic digestion through arresting methanogenesis by using hydrogen peroxide

Xu, Yanran; He, Zhen

doi:10.1002/wer.1575

Cited by 12 publications

(3 citation statements)

References 29 publications

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“…This observation is consistent with the finding that these substrates also had the highest SUM-VFA concentrations (Table 4). Despite the possibility of inhibition due to the high SUM-VFA concentration, it was not observed during the experiments because the inoculum used had a high buffer capacity [51][52][53][54][55].…”

Section: Energy Balancementioning

confidence: 99%

Coupled Biogas and Fiber Production from Agricultural Residues and Energy Crops with Steam Explosion Treatment

Hülsemann

Baumgart

Lenz

et al. 2023

Applied Biosciences

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The global demand for packaging materials and energy is constantly increasing, requiring the exploration of new concepts. In this work, we presented a bioeconomic concept that uses steam explosion and phase separation to simultaneously generate fibers for the packaging industry and biogas substrate for the energy sector. The concept focused on fiber-rich residues and fiber-rich ecological energy crops from agriculture. Feasibility of the concept in the laboratory using feedstocks, including Sylvatic silphia silage, Nettle silage, Miscanthus, Apple pomace, Alfalfa stalks, and Flax shives was confirmed. Our results showed that we were able to separate up to 26.2% of the methane potential while always extracting a smaller percentage of up to 17.3% of organic dry matter (ODM). Specific methane yields of 297–486 LCH4 kgODM−1 in the liquid and 100–286 LCH4 kgODM−1 in the solid phase were obtained. The solid phases had high water absorption capacities of 216–504% due to the steam explosion, while the particle size was not significantly affected. The concept showed high potential, especially for undried feedstock.

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Section: Energy Balancementioning

confidence: 99%

Coupled Biogas and Fiber Production from Agricultural Residues and Energy Crops with Steam Explosion Treatment

Hülsemann

Baumgart

Lenz

et al. 2023

Applied Biosciences

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“…Hydrothermally treated thickened waste-activated sludge 1.53 [38] Glucose (methanogenesis inhibition using H 2 O 2 ) 1.23 [39] Food waste (methanogenesis inhibition using 2-bromoethanesulfonate) 0.8 [40] Pretreated corn stover (methanogenesis inhibition using 2-bromoethanesulfonate) 2.19 [41] Pulp sludge torrefaction condensate (methanogenesis inhibition using 2-bromoethanesulfonate) 1.1-4.78 This study…”

Section: Substratementioning

confidence: 99%

Integrating Torrefaction of Pulp Industry Sludge with Anaerobic Digestion to Produce Biomethane and Volatile Fatty Acids: An Example of Industrial Symbiosis for Circular Bioeconomy

et al. 2022

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Industrial symbiosis, which allows the sharing of resources between different industries, could help to improve the overall feasibility of bio-based chemicals production. In that regard, this study focused on integrating the torrefaction of pulp industry sludge with anaerobic digestion. More specifically, anaerobic digestion (AD) of pulp sludge-derived torrefaction condensate (TC) was studied to evaluate the biomethane and volatile fatty acid (VFA) potential. The torrefaction condensate produced at 275 and 300 °C was used in AD. The volatile solid content (VS) was 6.69 and 9.01% for the condensate produced at 275 and 300 °C, respectively. The organic fraction of TC mainly contained acetic acid, 2-furanmethanol, and syringol. The methane yield was in the range of 481–772 mL/g VS for the mesophilic and 401–746 mL/g VS for the thermophilic process, respectively. The VFA yield was in the range of 1.1 to 3.4 g/g VS for mesophilic and from 1.5 to 4.7 g/g VS in thermophilic conditions, when methanogenesis was inhibited. Finally, pulp sludge TC is a feasible feedstock to produce platform chemicals like VFA. However, at higher substrate loading, signs of process inhibition were observed because of the relatively increasing concentration of microbial inhibitors

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“…Evaluations of sludge extent of digestion can be made from its volatile solids content and its ability to dewater [19]. Studies also reported that inoculum pretreatment of sludge can regulate the volatile fatty acid accumulation [20]. Anaerobic biodegradation is a complex process involving many microbial steps that are conducted by different groups of bacteria, and the toxicity that occurs during anaerobic treatments typically occurs as a result of the incubation of methanogenic/acetogenic bacteria.…”

Section: Degradation Capability Of Aerated Leachate In Anaerobic Systemmentioning

confidence: 99%

Influence of Abiotic Factors on Coir Retting Process

Subhadra¹,

Johnson

et al. 2022

Curr. Appl. Sci. Technol.

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Coconut husk represents the entire fibrous envelop in the fruit and constitute both the exocarp and mesocarp in the raw material for the coir industry. Retting results in separation of this fibrous envelop which is an assemblage of fibers with cork like parenchymatous cells containing a cementing material dispersed throughout the mass. The present study attempted to determine the effect of pH, aeration and degradation capability of aerated leachate on coconut husk retting. The experiment was done in seven buckets of 5L capacity and the pH of water in each bucket was adjusted from 3.0-9.0 with 600g of 11 months old fresh coconut husks immersed in each bucket. The parameters of color, pH, volatile fatty acid (VFA), chemical oxygen demand (COD) and polyphenols were analyzed regularly during the study. The effects of aeration and the degradation capability of aerated leachate was also studied. The VFA and COD level increased initially and then decreased. Neutral pH was found to be ideal for the leaching process.

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Enhanced volatile fatty acids accumulation in anaerobic digestion through arresting methanogenesis by using hydrogen peroxide

Cited by 12 publications

References 29 publications

Coupled Biogas and Fiber Production from Agricultural Residues and Energy Crops with Steam Explosion Treatment

Coupled Biogas and Fiber Production from Agricultural Residues and Energy Crops with Steam Explosion Treatment

Integrating Torrefaction of Pulp Industry Sludge with Anaerobic Digestion to Produce Biomethane and Volatile Fatty Acids: An Example of Industrial Symbiosis for Circular Bioeconomy

Influence of Abiotic Factors on Coir Retting Process

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