Optimization of micro-aeration intensity in acidogenic reactor of a two-phase anaerobic digester treating food waste

Xu, Suyun; Selvam, Ammaiyappan; Wong, Jonathan W.C.

doi:10.1016/j.wasman.2013.10.038

Cited by 125 publications

(54 citation statements)

References 31 publications

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“…The same trend between oxygen load and methane yield was also reported by Mshandete et al [18] and Botheju et al [27]. The reason behind these could be inhibition of methanogens and substrate competition of facultative organisms [4,28].…”

Section: The Effect Of Microaerobic Condition On the Thermophilic Fersupporting

confidence: 79%

Effect of Different Mixed Microflora on the Performance of Thermophilic Microaerobic Pretreatment

Shi

Meng

et al. 2016

Energy Fuels

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h i g h l i g h t sThe effect of limited oxygen daily supplied on the AD of corn straw was studied. Daily oxygen supplied could obviously improve the AD performance of corn straw. Specific methanogenic activity under microaerobic condition improved slightly. The microbial community structure shift could explain the better AD performance. a r t i c l e i n f o b s t r a c tConventionally, oxygen is considered as inhibit factor of anaerobic digestion (AD). However, recent studies have demonstrated that AD performance could be enhanced by introducing limited amounts of oxygen (or air) directly into the anaerobic digester or during pretreatment step. In this study, impacts of microaeration on the anaerobic digestion of corn straw and the microbial community structure were investigated. Results showed that limited air introduced into fermentation system could improve the methane yield of corn straw. Maximum cumulative methane yield of 216.8 ml/g VS substrate and maximum VS removal efficiency of 54.3% were simultaneously obtained under microaerobic condition with the air load of 12.5 ml/L R per day, which were 16.5% and 10.3% higher than those of sample under anaerobic condition, respectively. Compared to anaerobic condition, the relative abundances of phylum Firmicutes, class Clostridia and order Clostridiales, which associated with hydrolysis process of AD were raised under microaerobic condition. In addition, the relative abundances of oxytolerant Methanosarcina and Methanobacterium were both doubled under microaerobic condition. Accordingly, specific methanogenic activity (SMA) under microaerobic condition improved slightly. The microbial community shift might be the reason for improved AD performance under microaerobic condition.

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Section: The Effect Of Microaerobic Condition On the Thermophilic Fersupporting

confidence: 79%

Effect of Different Mixed Microflora on the Performance of Thermophilic Microaerobic Pretreatment

Shi

Meng

et al. 2016

Energy Fuels

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“…The amount of oxygen supplied during pretreatment is very important, as excessive oxygen inhibits the activity of methane-forming microorganisms and decreases the production of methane (Xu et al 2014). In contrast, excessive oxygen can oxidize readily available substrates or facilitate aerobic M ethanotrophs to consume methane.…”

Section: Pretreatment Methodsmentioning

confidence: 99%

Pretreatment methods of lignocellulosic biomass for anaerobic digestion

et al. 2017

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Agricultural residues, such as lignocellulosic materials (LM), are the most attractive renewable bioenergy sources and are abundantly found in nature. Anaerobic digestion has been extensively studied for the effective utilization of LM for biogas production. Experimental investigation of physiochemical changes that occur during pretreatment is needed for developing mechanistic and effective models that can be employed for the rational design of pretreatment processes. Various-cutting edge pretreatment technologies (physical, chemical and biological) are being tested on the pilot scale. These different pretreatment methods are widely described in this paper, among them, microaerobic pretreatment (MP) has gained attention as a potential pretreatment method for the degradation of LM, which just requires a limited amount of oxygen (or air) supplied directly during the pretreatment step. MP involves microbial communities under mild conditions (temperature and pressure), uses fewer enzymes and less energy for methane production, and is probably the most promising and environmentally friendly technique in the long run. Moreover, it is technically and economically feasible to use microorganisms instead of expensive chemicals, biological enzymes or mechanical equipment. The information provided in this paper, will endow readers with the background knowledge necessary for finding a promising solution to methane production.

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“…The PBR was made of acrylic with a 14.5 cm inner diameter, and 26.4 cm height, having a useful volume of 1.5 L. As biofilm support, PVC rings 1 cm long and 1.22 cm in diameter were used to improve the leachate's flow [5]. For the collection of the leachate, an acrylic perforated plate was placed 5 cm from the bottom of the reactor and covered with a metal mesh.…”

Section: Pbrmentioning

confidence: 99%

“…Micro-aeration (PBR MICRO-AERATION ) was applied using a total flow of 254 L-air/kg-TS-d, the air was supplied for periods of 15 minutes every 2 hours per day according with to the work carried out by Xu et al [5,9]. The experiment was maintained until the VFAs reached maximum concentration and were consumed at values close to 500 mg/L.…”

Section: Pbrmentioning

confidence: 99%

Two Phase Anaerobic Digestion System of Municipal Solid Waste by Utilizing Microaeration and Granular Activated Carbon

Bacab

España-Gamboa²,

Espinoza

et al. 2020

Energies

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In an anaerobic digestion (AD) process, the hydrolysis phase is often limited when substrates with high concentrations of solids are used. We hypothesized that applying micro-aeration in the hydrolysis phase and the application of granular activated carbon (GAC) in the methanogenesis phase could make the AD process more efficient. A packed bed reactor (PBR) coupled with an up-flow anaerobic sludge blanket (UASB) was conducted, and its effects on methane generation were evaluated. The micro-aeration rate applied in PBR was 254 L-air/kg-Total solids (TS)-d was compared with a control reactor. Micro-aeration showed that it reduced the hydrolysis time and increased the organic matter solubilization as chemical oxygen demand (COD) increasing 200%, with a volatile fatty acids (VFAs) increment higher than 300%, compared to the control reactor (without aeration). Our findings revealed that the implementations of microaeration and GAC in the two-phase AD system could enhance methane production by reducing hydrolysis time, increasing solid waste solubilization.

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Optimization of micro-aeration intensity in acidogenic reactor of a two-phase anaerobic digester treating food waste

Cited by 125 publications

References 31 publications

Effect of Different Mixed Microflora on the Performance of Thermophilic Microaerobic Pretreatment

Effect of Different Mixed Microflora on the Performance of Thermophilic Microaerobic Pretreatment

Pretreatment methods of lignocellulosic biomass for anaerobic digestion

Two Phase Anaerobic Digestion System of Municipal Solid Waste by Utilizing Microaeration and Granular Activated Carbon

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