Functions of bacteria and archaea participating in the bioconversion of organic waste for methane production

Amin, Farrukh Raza; Khalid, Habiba; El‐Mashad, Hamed M.; Chen, Chang; Liu, Guangqing; Zhang, Ruihong

doi:10.1016/j.scitotenv.2020.143007

Cited by 125 publications

(42 citation statements)

References 226 publications

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“…Clostridium sensu stricto 1 and Clostridium sensu stricto 10 accounted for a large proportion in SI-0. Clostridium included a variety of bacteria that specialized in utilizing multiple sugars as carbon and energy sources to generate methanogenic precursors such as acetic acid, butyric acid, H 2 , and CO 2 ( Lanjekar et al, 2015 ; Amin et al, 2021 ). Compared with SI-UN, the higher RA of Clostridium in SI-0 might contribute to the acceleration of methane production at the early stage, as shown in Figure 4B .…”

Section: Resultsmentioning

confidence: 99%

Anaerobic and Microaerobic Pretreatment for Improving Methane Production From Paper Waste in Anaerobic Digestion

Song

Cai

et al. 2021

Front. Microbiol.

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Having been generated with a tremendous amount annually, paper waste (PW) represents a large proportion in municipal solid waste (MSW) and also a potential source of renewable energy production through the application of anaerobic digestion (AD). However, the recalcitrant lignocellulosic structure poses obstacles to efficient utilization in this way. Recently, anaerobic and microaerobic pretreatment have attracted attention as approaches to overcome the obstacles of biogas production. This study was set out to present a systematic comparison and assessment of anaerobic and microaerobic pretreatment of PW with different oxygen loadings by five microbial agents: composting inoculum (CI), straw-decomposing inoculum (SI), cow manure (CM), sheep manure (SM), and digestate effluent (DE). The hints of microbial community evolution during the pretreatment and AD were tracked by 16S rRNA high-throughput sequencing. The results demonstrated that PW pretreated by DE with an oxygen loading of 15 ml/gVS showed the highest cumulative methane yield (CMY) of 343.2 ml/gVS, with a BD of 79.3%. In addition to DE, SI and SM were also regarded as outstanding microbial agents for pretreatment because of the acceleration of methane production at the early stage of AD. The microbial community analysis showed that Clostridium sensu stricto 1 and Clostridium sensu stricto 10 possessed high relative abundance after anaerobic pretreatment by SI, while Bacteroides and Macellibacteroides were enriched after microaerobic pretreatment by SM, which were all contributable to the cellulose degradation. Besides, aerobic Bacillus in SI and Acinetobacter in SM and DE probably promoted lignin degradation only under microaerobic conditions. During AD, VadinBC27, Ruminococcaceae Incertae Sedis, Clostridium sensu stricto 1, Fastidiosipila, and Caldicoprobacter were the crucial bacteria that facilitated the biodegradation of PW. By comparing the groups with same microbial agent, it could be found that changing the oxygen loading might result in the alternation between hydrogenotrophic and acetoclastic methanogens, which possibly affected the methanogenesis stage. This study not only devised a promising tactic for making full use of PW but also provided a greater understanding of the evolution of microbial community in the pretreatment and AD processes, targeting the efficient utilization of lignocellulosic biomass in full-scale applications.

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Section: Resultsmentioning

confidence: 99%

Anaerobic and Microaerobic Pretreatment for Improving Methane Production From Paper Waste in Anaerobic Digestion

Song

Cai

et al. 2021

Front. Microbiol.

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“…Future identification of NAD + -RNAs in archaeal organisms will determine whether archaeal noncoding sRNAs, which may be involved in rRNA modification and antisense regulation (58–60), also carry NAD + caps, as it happens in non-coding RNAs of human, plant and bacterial cells (3, 8, 13). Additionally, several archaeal species, including the model organism used in this work, are capable of digesting organic compounds for methane production, which is of industrial and biotechnological interest for biofuel production and bioremediation (19, 20). Therefore, it is tempting to speculate that NAD + -capping occurring preferentially in transcripts involved in redox processes in many species (4, 6, 14, 57) may lead to its potential utilization in biotechnological applications.…”

Section: Discussionmentioning

confidence: 99%

“…Hence, the first aim of this study was to analyse archaeal RNA from Methanosarcina barkeri to search for NAD + caps. M. barkeri is an anaerobic methanogenic microorganism that ferments various carbon compounds and is involved in a number of biotechnological and ecological processes (19, 20); there is even a debate about the potential biological origin of Martian methane by similar organisms (21). The results of our analysis demonstrate that 5’-NAD + -RNAs exist in Archaea, and, therefore, NAD + capping is a universal RNA modification, common to all domains of life.…”

Section: Introductionmentioning

confidence: 99%

NAD⁺capping of RNA in Archaea and Mycobacteria

Ruiz-Larrabeiti

Benoni

Zemlianski

et al. 2021

Preprint

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Chemical modifications of RNA affect essential properties of transcripts, such as their translation, localization and stability. 5’-end RNA capping with the ubiquitous redox cofactor nicotinamide adenine dinucleotide (NAD+) has been discovered in organisms ranging from bacteria to mammals. However, the hypothesis that NAD+ capping might be universal in all domains of life has not been proven yet, as information on this RNA modification is missing for Archaea. Likewise, this RNA modification has not been studied in the clinically important Mycobacterium genus. Here, we demonstrate that NAD+ capping occurs in the archaeal and mycobacterial model organisms Methanosarcina barkeri and Mycobacterium smegmatis. Moreover, we identify the NAD+-capped transcripts in M. smegmatis, showing that this modification is more prevalent in stationary phase, and revealing that mycobacterial NAD+-capped transcripts include non-coding small RNAs, such as Ms1. Furthermore, we show that mycobacterial RNA polymerase incorporates NAD+ into RNA, and that the genes of NAD+-capped transcripts are preceded by promoter elements compatible with σA/σF dependent expression. Taken together, our findings demonstrate that NAD+ capping exists in the archaeal domain of life, suggesting that it is universal to all living organisms, and define the NAD+-capped RNA landscape in mycobacteria, providing a basis for its future exploration.

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“…62 The dominant phyla that contain most of the acidogenic bacteria are Bacteriodetes, Chloroflexi, Thermotogae, Firmicutes, and Proteobacteria. 63 Within the Firmicutes phyla genus Ruminococcus, Clostridium, Caldicellulosiruptor, Caldanaerobacter, Butyrivibrio, Acetivibrio, Halocella, and Eubacterium, Bacteroidetes genus Fibrobacteres, Spirochaetes genus Spirochaeta, and Thermotogae genus Fervidobacterium and Thermotogae, constitute the anaerobic hydrolytic bacteria population in AD. 61 In the AD system, degraders of lignocellulosic biomass can be found predominantly in the phylum Firmicutes and Bacteroidetes (Fig.…”

Section: Structural Compositionmentioning

confidence: 99%

Facilitated lignocellulosic biomass digestibility in anaerobic digestion for biomethane production: microbial communities' structure and interactions

Faisal

Thakur

Jalalah

et al. 2021

J of Chemical Tech & Biotech

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Lignocellulosic biomass is a highly available and suitable candidate for biogas/biomethane production. However, high concentration of recalcitrant lignin is the major obstacle in successful anaerobic digestion (AD). The main aim of this review is to highlight the applications and challenges of lignocellulosic biomass in AD from the recent reports. Potential approaches to improve instabilities in mesophilic AD process (such as microbial communities' development, co-digestion, biofilm carrier's addition, and essential nutrients supplement) were also reported. This review goes one more step deeper to discuss the key microbes involved in lignocellulosic biomass degradation. Biofilm carriers provide attached growth systems for microbes in AD and acts as redox mediators to accelerate the biotransformation of recalcitrant pollutants. Addition of nanoparticles (NPs) stimulate Firmicutes, Bacteroidetes, Methanosaeta, Methanobacterium, and Methanosarcina population which further improve biomethanation. The comprehensive study of these proposed strategies and microbial stimulation through additives would make the lignocellulosic biomethanation more feasible.

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Functions of bacteria and archaea participating in the bioconversion of organic waste for methane production

Cited by 125 publications

References 226 publications

Anaerobic and Microaerobic Pretreatment for Improving Methane Production From Paper Waste in Anaerobic Digestion

Anaerobic and Microaerobic Pretreatment for Improving Methane Production From Paper Waste in Anaerobic Digestion

NAD⁺capping of RNA in Archaea and Mycobacteria

Facilitated lignocellulosic biomass digestibility in anaerobic digestion for biomethane production: microbial communities' structure and interactions

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Functions of bacteria and archaea participating in the bioconversion of organic waste for methane production

Cited by 125 publications

References 226 publications

Anaerobic and Microaerobic Pretreatment for Improving Methane Production From Paper Waste in Anaerobic Digestion

Anaerobic and Microaerobic Pretreatment for Improving Methane Production From Paper Waste in Anaerobic Digestion

NAD+capping of RNA in Archaea and Mycobacteria

Facilitated lignocellulosic biomass digestibility in anaerobic digestion for biomethane production: microbial communities' structure and interactions

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NAD⁺capping of RNA in Archaea and Mycobacteria