Biomethane production characteristics, kinetic analysis, and energy potential of different paper wastes in anaerobic digestion

Li, Wanwu; Khalid, Habiba; Amin, Farrukh Raza; Zhang, Han; Dai, Zhuangqiang; Chen, Chang; Liu, Guangqing

doi:10.1016/j.renene.2020.04.035

Cited by 25 publications

(16 citation statements)

References 28 publications

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“…There are two peaks observed: one was around the 5th day, and another was between the 10th and 20th days. This phenomenon was related to the accumulation of intermediate products (e.g., VFAs), which has already been reported by Li et al (2020). The maximum DMY of untreated PW mixed with CI, SI, CM, SM, and DE were 15.1, 16.9, 22.0, 18.9, and 13.5 ml/gVS, respectively.…”

Section: Effect Of Microbial Pretreatment On Daily Methane Yieldsupporting

confidence: 77%

“…Table 3 provides a literature summary regarding the methane production of PW. It is clear that the organic loading in this study was the highest (47.7 gVS/L), followed by 25 gVS/L in the study of Yuan et al (2014) and 15 gVS/L in that of Li et al (2020) . On the other hand, the methane yield of 343.2 ml/gVS in this study was higher than the estimated methane yield (315.4 ml/gVS) of untreated PW, which was the weighted sum of maximum methane yield of untreated corrugated paper ( Krause et al, 2018 ) and tissue paper ( Li et al, 2020 ) at a ratio of 1 to 1.…”

Section: Resultsmentioning

confidence: 53%

“…C and R are physical constants referring to the molar volume (22.41 L/mol) and universal gas constant (8.314 L kPa/K/mol), respectively. The biogas compositions and volatile fatty acids (VFAs) contents were measured daily by a gas chromatograph (GC) system (7890B, Agilent, USA), and the detailed instruments were reported elsewhere (Li et al, 2020). The biodegradability (BD) was defined as the ratio of the experimental methane yield (EMY), namely, the highest CMY, divided by the TMY, as shown in Eq.…”

Section: Production Of Methane and Volatile Fatty Acidsmentioning

confidence: 99%

“…At present, the pathway for the environmentally friendly utilization of PW focuses on the recycling and reproduction for new paper products. However, only for limited cycles can the PW be reused due to the decreased fiber strength, whiteness, and quality in the reproduction ( Li et al, 2020 ). Besides, the PW tainted with glue, paint, food wastes, and other residues cannot be recycled, much of which is simply discarded as MSW ( Ma et al, 2020 ; Zhao et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

“…For decades, anaerobic digestion (AD) has been emerging as an efficient and viable solution for biowastes to alleviate environmental pollution and produce renewable energy ( Wang et al, 2021 ). Originated from wood, grass, and other plants, PW is mainly composed of lignocellulosic matter and can be applied in AD ( Li et al, 2020 ), whereas, similar to other feedstocks, the intrinsic lignocellulosic structure retards the decomposition of organic matter and negatively affects the biodegradation process ( Abraham et al, 2020 ). Therefore, many pretreatment strategies have been proposed to break the ceiling of their digestibility.…”

Section: Introductionmentioning

confidence: 99%

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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: Effect Of Microbial Pretreatment On Daily Methane Yieldsupporting

confidence: 77%