A comparative study of thermophilic and mesophilic anaerobic co-digestion of food waste and wheat straw: Process stability and microbial community structure shifts

Shi, Xuchuan; Guo, Xuerang; Zuo, Jiane; Wang, Yajiao; Zhang, Mengyu

doi:10.1016/j.wasman.2018.02.004

Cited by 140 publications

(40 citation statements)

References 39 publications

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“…The biogas yield decreased sharply when the concentration of VFA in the reactor reached 5620 mg HAOc/L. Xu et al [19] and Shi et al [34] reported that methanogenic activity was inhibited completely when the concentrations of VFA fell in the range of 5800 to 6900 mg/L, consistent with the present study. Reactor acidification is the most significant and common problem inhibiting methanogenic activity [17,18].…”

Section: Biogas Production At Various Hrts and Olrssupporting

confidence: 91%

“…accumulation of VFA and NH3-N. Figure 3a shows that pH value increased steadily at an HRT of 124 days due to the effect of a low concentration of VFA and an increased concentration of alkaline compounds, particularly NH3-N. Furthermore, the organic nitrogen in the FW could degrade into NH3-N; this accumulation of ammonia in the reactor increased the alkalinity and pH value [34]. When HRT decreased from 124 days to 62 days and OLR increased from 0.51 kg VS/m 3 /d to 1.4 kg VS/m 3 /d, pH decreased steadily from 7.0 to 6.5 (Figure 3a).…”

Section: Biogas Production At Various Hrts and Olrsmentioning

confidence: 99%

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Performance and Kinetic Model of a Single-Stage Anaerobic Digestion System Operated at Different Successive Operating Stages for the Treatment of Food Waste

et al. 2019

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A large quantity of food waste (FW) is generated annually across the world and results in environmental pollution and degradation. This study investigated the performance of a 160 L anaerobic biofilm single-stage reactor in treating FW. The reactor was operated at different hydraulic retention times (HRTs) of 124, 62, and 35 days under mesophilic conditions. The maximum biogas and methane yield achieved was 0.934 L/g VSadded and 0.607 L CH4/g VSadded, respectively, at an HRT of 124 days. When HRT decreased to 62 days, the volatile fatty acid (VFA) and ammonia accumulation increased rapidly whereas pH, methane yield, and biogas yield decreased continuously. The decline in biogas production was likely due to shock loading, which resulted in scum accumulation in the reactor. A negative correlation between biogas yield and volatile solid (VS) removal efficiency was also observed, owing to the floating scum carrying and urging the sludge toward the upper portion of the reactor. The highest VS (79%) and chemical oxygen demand (COD) removal efficiency (80%) were achieved at an HRT of 35 days. Three kinetic models—the first-order kinetic model, the modified Gompertz model, and the logistic function model—were used to fit the cumulative biogas production experimental data. The kinetic study showed that the modified Gompertz model had the best fit with the experimental data out of the three models. This study demonstrates that the stability and performance of the anaerobic digestion (AD) process, namely biogas production rate, methane yield, intermediate metabolism, and removal efficiency, were significantly affected by HRTs.

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Section: Biogas Production At Various Hrts and Olrssupporting

confidence: 91%

Section: Biogas Production At Various Hrts and Olrsmentioning

confidence: 99%

Performance and Kinetic Model of a Single-Stage Anaerobic Digestion System Operated at Different Successive Operating Stages for the Treatment of Food Waste

et al. 2019

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“…The species of Methanosarcina was the major methanogen under the thermophilic condition, while the predominant methanogen was Methanothrix under the mesophilic condition. The optimal proportion of the food waste in co-digestion with wheat straw was observed to be 50 and 90% for thermophilic and mesophilic conditions, respectively [89]. Some of the results of these studies are summarized in Table 2.…”

Section: Microbial Community Structure and Synergymentioning

confidence: 96%

A Review on Anaerobic Co-Digestion with a Focus on the Microbial Populations and the Effect of Multi-Stage Digester Configuration

et al. 2019

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Recent studies have shown that anaerobic co-digestion (AnCoD) is superior to conventional anaerobic digestion (AD). The benefits of enhanced bioenergy production and solids reduction using co-substrates have attracted researchers to study the co-digestion technology and to better understand the effect of multi substrates on digester performance. This review will discuss the results of such studies with the main focus on: (1) generally the advantages of co-digestion over mono-digestion in terms of system stability, bioenergy, and solids reduction; (2) microbial consortia diversity and their synergistic impact on biogas improvement; (3) the effect of digester mode, i.e., multi-stage versus single stage digestion on AnCoD. It is essential to note that the studies reported improvement in the synergy and diverse microbial consortia when using co-digestion technologies, in addition to higher biomethane yield when using two-stage mode. A good example would be the co-digestion of biodiesel waste and glycerin with municipal waste sludge in a two-stage reactor resulting in 100% increase of biogas and 120% increase in the methane content of the produced biogas with microbial population dominated by Methanosaeta and Methanomicrobium.

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“…On average, it is estimated that 300-1000 L of biogas per kg of fermentable volatile solids [15] can be produced, varying the hydraulic residence time of the biomass in the anaerobic reactor between 10 and 30 days depending on its greater or lesser biodegradability [51]. The biogas produced usually has a CH 4 content of 56.7% and 63.5% [61,40], although this proportion can increase up to 80% CH 4 if really easily degradable substrates and optimum conditions are used.…”

Section: Generation Of Biogas: Anaerobic Digestionmentioning

confidence: 99%

Development of an efficient and sustainable energy storage system by hybridization of compressed air and biogas technologies (BIO-CAES)

Llamas

Ortega

Barthelemy

et al. 2020

Energy Conversion and Management

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The future electricity generation model will require the integration of intermittent renewable sources. For that, the development of new efficient and sustainable energy storage technologies is mandatory. One of the most promising technologies is the utilization of compressed air energy storage (CAES). However, this technology has a limitation related with the management of the heat generated in the compression stage. In this study it is proposed the integration of a CAES system together with an anaerobic digester, which will use the generated heat, supporting the production and storage of biogas as chemical storage of energy. The latter will be used in the air expansion stage to maximize the efficiency of the overall process. In this way, a new energy storage technology by hybridization of BIOgas and CAES is achieved: BIO-CAES technology.

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A comparative study of thermophilic and mesophilic anaerobic co-digestion of food waste and wheat straw: Process stability and microbial community structure shifts

Cited by 140 publications

References 39 publications

Performance and Kinetic Model of a Single-Stage Anaerobic Digestion System Operated at Different Successive Operating Stages for the Treatment of Food Waste

Performance and Kinetic Model of a Single-Stage Anaerobic Digestion System Operated at Different Successive Operating Stages for the Treatment of Food Waste

A Review on Anaerobic Co-Digestion with a Focus on the Microbial Populations and the Effect of Multi-Stage Digester Configuration

Development of an efficient and sustainable energy storage system by hybridization of compressed air and biogas technologies (BIO-CAES)

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