Single-phase and two-phase anaerobic digestion of fruit and vegetable waste: Comparison of start-up, reactor stability and process performance

Ganesh, Rangaraj; Torrijos, Michel; Sousbie, Philippe; Lugardon, Aurelien; Steyer, Jean-Philippe; Delgenès, J. P.

doi:10.1016/j.wasman.2014.02.023

Cited by 126 publications

(42 citation statements)

References 35 publications

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“…The average specific methane generation rate was 456ml.gVS -1 , considered within reported ranges for thermophilic AD of food waste (336 to 557 ml.gVS-1 at OLR = 2.0 and 1.5 gVS.l -1 .d -1 ; respectively, Guo et al, 2014).Upon reducing the stirring velocity to 50 rpm, methane production increased by 26% to reach 573ml.gVS -1 , considered at the high-end of reported values (Guo et al, 2014) (Figure 3.c). The average VS and TCOD removal rates remained almost the same (86% and 83%, respectively) and within reported ranges in digesters treating fruit and vegetable waste (Ganesh et al, 2014); yet soluble COD removal dropped slightly (from 83% to 75%) (Figure 3.d). The increase in VFA concentrations to 2.0 g.l -1 , when coupled with the low IA/PA ratio of 0.3, can still be considered acceptable for AD of SS-OFMSW (Martin-Gonzalez et al, 2013).…”

Section: Digester Bsupporting

confidence: 73%

Correlation between system performance and bacterial composition under varied mixing intensity in thermophilic anaerobic digestion of food waste

Ghanimeh

Al-Sanioura

Saikaly

et al. 2018

Journal of Environmental Management

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This study examines the stability and efficiency of thermophilic anaerobic digesters treating food waste under various mixing velocities (50-160 rpm). The results showed that high velocities (120 and 160 rpm) were harmful to the digestion process with 18-30% reduction in methane generation and 1.8 to 3.8 times increase in volatile fatty acids (VFA) concentrations, compared to mild mixing (50 and 80 rpm). Also, the removal rate of soluble COD dropped from 75 to 85% (at 50-80 rpm) to 20-59% (at 120-160 rpm). Similarly, interrupted mixing caused adverse impacts and led to near-failure conditions with excessive VFA accumulation (15.6 g l), negative removal rate of soluble COD and low methane generation (132 ml gVS). The best efficiency and stability were achieved under mild mixing (50 and 80 rpm). In particular, the 50 rpm stirring speed resulted in the highest methane generation (573 ml gVS). High-throughput sequencing of 16S rRNA genes revealed that the digesters were dominated by one bacterial genus (Petrotoga; phylym Thermotogae) at all mixing velocities except at 0 rpm, where the community was dominated by one bacterial genus (Anaerobaculum; phylum Synergistetes). The Petrotoga genus seems to have played a major role in the degradation of organic matter.

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Section: Digester Bsupporting

confidence: 73%

Correlation between system performance and bacterial composition under varied mixing intensity in thermophilic anaerobic digestion of food waste

Ghanimeh

Al-Sanioura

Saikaly

et al. 2018

Journal of Environmental Management

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“…The alkalinity in the digesters was in the range of 3500-5000 mg CaCO 3 /L and the VFAs were between 90 and 560 mg L 21 over all phases of operation. Similar ranges of alkalinity and VFA have been reported to be indicative of stable conditions [31][32][33].…”

Section: Resultssupporting

confidence: 77%

Codigestion of high pressure thermal hydrolysis‐treated thickened waste activated sludge with primary sludge in two‐stage anaerobic digestion

Sarwar

Elbeshbishy

Parker

2017

Env Prog and Sustain Energy

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Pretreatment of thickened waste activated sludge (TWAS) with high pressure thermal hydrolysis (HPTH) prior to codigestion with primary sludge (PS) in two-stage anaerobic digestion was evaluated at two systems hydraulic residence times (HRTs). Pretreatment increased the soluble COD (SCOD) entering the acidogenic digester and at a 2 day HRT the increase in SCOD through the digester was also enhanced. With a 1 day HRT in the acidogenic digester the increment in SCOD concentrations was smaller in the pretreated reactor than in the control reactor suggesting there is a minimum residence time required to maintain hydrolysis of pretreated TWAS. At the 2 day HRT fermentation to volatile fatty acids (VFA) was similar in both reactors despite the considerably higher SCOD concentrations in the pretreated sludge. In contrast, at the 1 day HRT the pretreated digester VFA concentrations were 36% higher than that of the control digester. The control and pretreated methanogenic digesters operating at an HRT of 13 days had average total COD (TCOD) removal efficiencies of 45 and 52%, respectively which was consistent with an increase in methane yield from 0.19 L CH 4 /g COD for the control system to 0.23 L CH 4 /g COD for the pretreated system. With an HRT of 9 days, the corresponding TCOD removal efficiencies were reduced to 43% in and 48% respectively and the methane yields were 0.14 and 0.16 L CH 4 /g COD, respectively. COD removal to methane was found to be not significantly different between the control and pretreated systems at the reduced HRT.

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“…Moreover, according to previous research, good results were obtained by a two-phase mesophilic anaerobic digestion process [11][12][13]. By separating the hydrolysis-acetogenesis and methanogenesis phases, a higher yields of VFAs and methane and a better process stability were achieved [14].…”

Section: Introductionmentioning

confidence: 84%

Improving biomethane yield by controlling fermentation type of acidogenic phase in two-phase anaerobic co-digestion of food waste and rice straw

Xue

Yuan

Zou

et al. 2015

Chemical Engineering Journal

149

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Single-phase and two-phase anaerobic digestion of fruit and vegetable waste: Comparison of start-up, reactor stability and process performance

Cited by 126 publications

References 35 publications

Correlation between system performance and bacterial composition under varied mixing intensity in thermophilic anaerobic digestion of food waste

Correlation between system performance and bacterial composition under varied mixing intensity in thermophilic anaerobic digestion of food waste

Codigestion of high pressure thermal hydrolysis‐treated thickened waste activated sludge with primary sludge in two‐stage anaerobic digestion

Improving biomethane yield by controlling fermentation type of acidogenic phase in two-phase anaerobic co-digestion of food waste and rice straw

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