Enhancing the performance of thermophilic anaerobic digestion of food waste by introducing a hybrid anaerobic membrane bioreactor

Jiang, Mengmeng; Wu, Zhiyue; Yao, Junqiang; Wandera, Simon M.; Algapani, Dalal E.; Dong, Renjie; Qiao, Wei

doi:10.1016/j.biortech.2021.125861

Cited by 39 publications

(6 citation statements)

References 44 publications

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“…For example, the biomarker, Acetomicrobium functions in acid and hydrogen production at the optimal growth temperature of 58–73 °C, resulting in their dominance in the thermophilic digestor. The same function was also reported on Candidatus_Caldatribacterium belonging to Caldatribacteriota . These bacteria collectively promoted the hydrolysis of GMRs and WS in the thermophilic condition.…”

Section: Resultssupporting

confidence: 73%

“…The same function was also reported on Candidatus_Caldatribacterium belonging to Caldatribacteriota. 44 These bacteria collectively promoted the hydrolysis of GMRs and WS in the thermophilic condition. LEfSe analysis also revealed that Coprothermobacter from Coprothermobacterota and Clostridia from Firmicutes were crucial in the thermophilic reactors as they could survive in extreme environment.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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The Effect of Operating Strategies on the Anaerobic Digestion of Gentamicin Mycelial Residues: Insights into the Enhancement of Methane Production and Attenuation of Gentamicin Resistance

Jiang

Wang

Liu

et al. 2022

Environ. Sci. Technol.

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Anaerobic digestion (AD) has been widely employed for converting various biowastes into renewable energy. However, AD of gentamicin mycelial residues (GMRs, a byproduct of gentamicin production) is limited by ammonia inhibition and antimicrobial resistance risk. Compared to mesophilic AD (MMAD) of GMRs, this study looked into three semicontinuous AD processes, i.e., codigestion with wheat straw, thermophilic digestion (TAcoD), and AD at shortened retention time (RT). Results showed that a stable and safe AD could be achieved under suitable operating conditions. Co-digestion could effectively mitigate the adverse effect of ammonia inhibition. The methane production increased by 35.86% in TAcoD compared to that in MMAD and 43.99% of hazardous waste was reduced in TAcoD. Concerning the antimicrobial resistance of AD system, gentamicin was degraded efficiently and the degradation process was not involved in the expression of antibiotic resistance genes (ARGs) related to modifying enzyme. Effective removal of ARGs under three operating strategies was associated with a higher reduction in bacterial abundance of potential hosts. In addition, the changes in the relevant proteins for transformation and conjugation as predicted by PICRUSt suggested that thermophilic condition and shorter RT were conducive to the reduction of the dissemination risks of ARGs.

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Section: Resultssupporting

confidence: 73%

Section: ■ Results and Discussionmentioning

confidence: 99%

The Effect of Operating Strategies on the Anaerobic Digestion of Gentamicin Mycelial Residues: Insights into the Enhancement of Methane Production and Attenuation of Gentamicin Resistance

Jiang

Wang

Liu

et al. 2022

Environ. Sci. Technol.

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“…Unstable process conditions as a common operational problem are encountered in CADs . Researchers showed that AnMBR is a prominent alternative to overcome process instability and increase chemical energy harvesting from the feedstock (Jiang et al 2021). Serna-Garcia et al (2020a) showed that CAD for microalgae and PS co-digestion could not reach the desired stabilized operation, which was evaluated by the ratio of VFA alkalinity to total alkalinity.…”

Section: Sludge Streammentioning

confidence: 99%

Enhanced energy recovery in municipal wastewater treatment plants through co-digestion by anaerobic membrane bioreactors: current status and future perspectives

Cengiz,

Guven,

Ozgun

et al. 2024

Rev Environ Sci Biotechnol

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Today, the transition to renewable energy from conventional energy practices is more important than ever to establish energy security and mitigate climate change. The wastewater treatment plants (WWTP) consume a remarkable amount of energy and cause significant greenhouse gas emissions. The energy balance of WWTP can be improved by implementing energy-efficient applications such as anaerobic digestion. However, most of the existing WWTPs utilize only sewage sludge in conventional anaerobic digesters (CAD) which results in low biogas generation. Generally, co-digestion is indicated as an effective solution for the low biogas generation faced in mono-digestion. Moreover, recently, anaerobic membrane bioreactors (AnMBR) have been promoted as a prominent alternative to CADs. This paper overviews the current situation of co-digestion applications by AnMBRs for municipal WWTPs. Furthermore, the environmental and economic aspects of these applications were reviewed. Lastly, challenges and future perspectives related to the co-digestion applications by AnMBR were thoroughly discussed. Graphical Abstract

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Section: Process Stability Performancementioning

confidence: 99%

“…Reports on thermophilic operations reveal that, under conditions of low VFA concentration, a collection of hydrogenotrophic methanogens prevails, while the accumulation of VFA induces the growth of acetolactic methanogens [47]. Another study by Jiang [48] proposes that the specific methanogenic pathway is dependent on the acetate degradation status in the anaerobic digestion reactor. This suggests that, in this study, the growth of acetolactic methanogens was inhibited, hence the accumulation of acetate, whereas the bacterial responsible for propionate degradation were also predominant, leading to their low concentration.…”

Section: Process Stability Performancementioning

confidence: 99%

Restoring the Stability of Long-Term Operated Thermophilic Anaerobic Digestion of Maize Straw by Supplying Trace Elements

Fosua,

Ren,

Qiao

et al. 2023

Processes

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Maize straw has been widely used for the production of energy through anaerobic digestion, but biogas production can be hindered by a lack of trace elemental nutrients. To address this issue, a lab-scale anaerobic plug flow reactor was continuously operated at 55 °C for 300 days, with a hydraulic retention time of 42 days and an organic loading rate of 2.1 g total solids/(L·day). Results from this study showed that between days 101 and 194, the methane yield slightly decreased from 0.26 ± 0.04 to 0.24 ± 0.03 L/g volatile solids (VS), but significant volatile fatty acid accumulation was observed by reaching up to 2759 ± 261 mg/L. After trace elements were added to the reactor, the methane yield increased to 0.30 ± 0.03 L/g VS, with 53% methane content. Around 62% of the total chemical oxygen demand and volatile solids were broken down into methane. Volatile fatty acid levels dropped and stabilized at around 210 ± 50 mg/L, indicating restored process stability. The addition of trace elements increased the abundance of Firmicutes and decreased Synergistetes in bacteria while simultaneously increasing the abundance of Methanosarcina in archaea. In conclusion, trace element supplementation was experimentally found to be necessary for stable thermophilic anaerobic digestion of maize straw.

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Enhancing the performance of thermophilic anaerobic digestion of food waste by introducing a hybrid anaerobic membrane bioreactor

Cited by 39 publications

References 44 publications

The Effect of Operating Strategies on the Anaerobic Digestion of Gentamicin Mycelial Residues: Insights into the Enhancement of Methane Production and Attenuation of Gentamicin Resistance

The Effect of Operating Strategies on the Anaerobic Digestion of Gentamicin Mycelial Residues: Insights into the Enhancement of Methane Production and Attenuation of Gentamicin Resistance

Enhanced energy recovery in municipal wastewater treatment plants through co-digestion by anaerobic membrane bioreactors: current status and future perspectives

Restoring the Stability of Long-Term Operated Thermophilic Anaerobic Digestion of Maize Straw by Supplying Trace Elements

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