Semi-continuous anaerobic digestion of extruded OFMSW: Process performance and energetics evaluation

Mu, Lan; Zhang, Lei; Zhu, Kongyun; Ma, Jun; Li, Aimin

doi:10.1016/j.biortech.2017.09.085

Cited by 54 publications

(25 citation statements)

References 49 publications

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“…Batch AD tests were performed to investigate the effects on biogas production of two factors, namely the organic load and the mixing ratio between the liquid and solid fractions from press-extrusion. For each factor, two values were selected from scientific literature [18,22], to test a "low" (−) and a "high" (+) level in four different combinations, in accordance with a 2 2 factorial design ( Table 2).…”

Section: The Experimental Planmentioning

confidence: 99%

“…Press-extruded OFMSW, already partly solubilised, could be then applied as substrate in wet anaerobic digesters to enhance the organic load and increase, in turn, the digester treatment capacity. A further option to improve the organic load to the digester raises from the study of Mu et al [18], who pointed out that mixing the LF from OFMSW press-extrusion with the solid one originated from the same pretreatment may increase AD stability.…”

Section: Introductionmentioning

confidence: 99%

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Press-extrusion pretreatment of the organic fraction of municipal solid waste for enhanced methane production

Cesaro

Cieri

Belgıorno

2020

J Mater Cycles Waste Manag

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Anaerobic digestion (AD) is a well-established process for the treatment of a wide variety of solid organic substrates, including the organic fraction of municipal solid waste (OFMSW). At industrial scale, the mechanical pretreatment is a fundamental step to reduce OFMSW particle size and to promote the hydrolysis within the subsequent AD process. Among the mechanical pretreatment technologies, press-extrusion has recently raised great interest for its possible application to either enhance the organic load to the digester or improve the overall process stability and methane yields. Aim of this study was in assessing the potential of the press-extrusion pretreatment to improve the performance of OFMSW anaerobic degradation. Batch tests were set up according to a full factorial design of experiments to assess the significance of the main operating parameters. The statistical analysis of results addressed further tests, carried out under semi-continuous feeding mode, to better discuss the possible application of press-extrusion for the greatest valorization of OFMSW under anaerobic conditions.

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Section: The Experimental Planmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Press-extrusion pretreatment of the organic fraction of municipal solid waste for enhanced methane production

Cesaro

Cieri

Belgıorno

2020

J Mater Cycles Waste Manag

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“…2.4.1 Hydrolysis efficiency. The hydrolysis efficiency (h Hy ) is dened as the ratio of sCOD in the leachate to the initial dry chemical oxygen demand (TCOD) of the biodegradable substrate, is calculated by eqn (1).…”

Section: Analytical Techniquesmentioning

confidence: 99%

“…The organic fraction of municipal solid waste (OFMSW) is currently one of the major interests in the research community due to its high biodegradability (BD) and its potential for environmental pollution. 1 Especially in developing countries, OFMSW is characterized by a wide range of easily biodegradable organic matter which includes 37-51% carbon and 80-90% volatile solids. 2 Food waste (FW) and paper waste (PW) are two major components of OFMSW, comprising a total of ca.…”

Section: Introductionmentioning

confidence: 99%

The effect of ISR on OFMSW during acidogenic fermentation for the production of AD precursor: kinetics and synergies

Soomro

Ni²,

et al. 2019

RSC Adv.

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“…This difference can be explained by the fact that the bioloading is fully decomposed during the periodic‐type process. As a result, organic particles are fully decomposed and methane production evenly decreases after reaching its maximum values (Bi et al, ; Meegoda, Li, Patel, & Wang, ; Mu, Zhang, Zhu, Ma, & Li, ). The operation of continuous or semi‐continuous bioreactors is based on cyclic addition of some amount (depends on organic loading rate) of raw biomass and extracting the same amount of processed biomass after some period of digestion time.…”

Section: Introductionmentioning

confidence: 99%

Experimental research of efficiency of semi‐continuous and periodic biogas production processes by using chicken manure bioloadings

Baltrėnas

Kolodynskij

2019

Water Environment Research

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Semi-continuous and periodic biogas production processes were investigated. Dry chicken manure containing 40.0 ± 0.5% volatile solids (VS) was used for the production of bioloading. Semi-continuous operation bioreactor and periodic bioreactor were used to implement research. Bioloading was additionally supplemented with newly prepared parts by removing 10% of decomposed mass and by adding the same amount of preheated mass every 7 days (semi-continuous process). The process was periodic when the mass was completely decomposed (after 45 days of the experiment) and fully removed (bioreactor was loaded with a new portion of raw material to 100% of the working volume again). Total duration of both experiments was 90 days. The results show that biogas production by semi-continuous process is more effective than periodic process due to higher total biogas yield (up to 39.7%) and higher methane yield (up to 33.5%). The maximum concentration of CH 4 was determined during the periodic biogas production process, but the difference was only up to 2.1% (68.9% and 66.8%, respectively). Since the produced biogas had quite high average CO 2 and H 2 S concentrations (<40.0% and 2.1 g/m 3 , respectively), it is recommended to use filter-adsorbers or biofilters. According to the results, semi-continuous type bioreactor is more effective than periodic. • Practitioner points• Maximum CH 4 concentration in biogas, produced during periodic process, is 2.1% higher than during the semi-continuous process. • Average CH 4 concentration in biogas, produced during periodic and semi-continuous process, reaches 52.7% and 53.0%, respectively. • Biogas and methane yield (during periodic process) is 39.7% and 33.5% lower than during the semi-continuous process. • CH 4 concentration decreases (after supplement) about 6.0%-7.0% (during the semicontinuous process), but increases to the next cyclic bioloading supplement. • Semi-continuous biogas production process is more efficient than periodic.

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Semi-continuous anaerobic digestion of extruded OFMSW: Process performance and energetics evaluation

Cited by 54 publications

References 49 publications

Press-extrusion pretreatment of the organic fraction of municipal solid waste for enhanced methane production

Press-extrusion pretreatment of the organic fraction of municipal solid waste for enhanced methane production

The effect of ISR on OFMSW during acidogenic fermentation for the production of AD precursor: kinetics and synergies

Experimental research of efficiency of semi‐continuous and periodic biogas production processes by using chicken manure bioloadings

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