2021
DOI: 10.3389/fceng.2021.711971
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Phase Separation in Anaerobic Digestion: A Potential for Easier Process Combination?

Abstract: The flexibilization of bioenergy production has the potential to counteract partly other fluctuating renewable energy sources (such as wind and solar power). As a weather-independent energy source, anaerobic digestion (AD) can offer on-demand energy supply through biogas production. Separation of the stages in anaerobic digestion represents a promising strategy for the flexibilization of the fermentative part of biogas production. Segregation in two reactor systems facilitates monitoring and control of the pro… Show more

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Cited by 33 publications
(17 citation statements)
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“…In the study, biogas production was high regardless of OLRs, even though the COD removal was lower than noted by other researchers using single-stage tank anaerobic reactors. According to the literature, the separation of metabolic pathways of the digestion enhanced to produce biogas, because the products of the hydrolysis could be added dynamically to the methanogenic stage [1,64,65]. The results of this work could be taken for optimizing the operational conditions of the full-scale plant and also as a starting basis for scaling up the process to the industrial scale.…”
Section: Resultsmentioning
confidence: 99%
“…In the study, biogas production was high regardless of OLRs, even though the COD removal was lower than noted by other researchers using single-stage tank anaerobic reactors. According to the literature, the separation of metabolic pathways of the digestion enhanced to produce biogas, because the products of the hydrolysis could be added dynamically to the methanogenic stage [1,64,65]. The results of this work could be taken for optimizing the operational conditions of the full-scale plant and also as a starting basis for scaling up the process to the industrial scale.…”
Section: Resultsmentioning
confidence: 99%
“…The decrease in the concentration of SO 4 − 2 at the methanogenic phase is mainly due to the anaerobic microbial process (sulfate reduction). This sulfate reduction was mainly attributed to the hydrolytic-acidogenic reactor which acts as the sulfidogenic-acidogenic reactor in phase-separated AD (Janesch et al 2021 ; Mburu et al 2012 ). Furthermore, a comparable conclusion was drawn with the finding of the present study for the SO 4 − 2 and S − 2 effluent concentrations of AD by different scholars in treating slaughterhouse and other agro-industrial wastewater using an anaerobic reactor via biogas production (Alemu et al 2019 ; Toledo et al 2016 ) due to the low synthesis of bacteria or sulfate reduction process in methanogenesis phase in particular and in AD system in general (Sindhu and Meera 2012 ) recommending further biological treatment system requirement of post-AD.…”
Section: Resultsmentioning
confidence: 99%
“…To this end, phased AD has been given due attention to optimizing each reactor to attain the highest performance-transformation of organic matters in wastewater to biogas and pollutant removal efficiency (Van et al 2020 ). To optimize the HR and MR reactors, it could be useful to engineer the operation of the HR towards acid formation which the methanogens prefer as a substrate and the MR to produce higher biogas and remove more pollutants (Eylem 2017; Ghorbanian 2014 ; Janesch et al 2021 ). Furthermore, regardless of their current importance and upcoming potential, anaerobic wastewater treatment systems have not always cherished auspicious standing (McCarty 1964).…”
Section: Introductionmentioning
confidence: 99%
“…The two-stage system mentioned here denotes a two-tank system interconnected with P-R wherein the methanogenesis occurs in both digesters. This is not to be confused with a two-phase system (phase separation), wherein hydrolysis and acidogenesis occur in one tank and methanogenesis occurs in the subsequent tank [ 29 ]; even though some studies use the ‘two-stage’ lexicon to indicate two phases [ 30 , 31 ].…”
Section: Methodsmentioning
confidence: 99%