Anaerobic granulation: A review of granulation hypotheses, bioreactor designs and emerging green applications

Show, Kuan Yeow; Yan, Yue-Gen; Yao, Hai-Yong; Hui, Guo; Li, Ting; Show, De Yang; Chang, Jo‐Shu; Lee, Dong Hoon

doi:10.1016/j.biortech.2020.122751

Cited by 87 publications

(24 citation statements)

References 78 publications

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“…Comparison of granule percentages and mean diameter in both reactors showed slightly more favorable results for R1 operating at lower up-flow velocity. Proper manipulation of up-flow liquid velocity is critical for granule formation [ 11 ]. Indeed, selection pressure from hydraulic (and gas) loading rates has been related to washout of light and dispersed sludge while retaining denser particles promote granulation [ 32 ].…”

Section: Resultsmentioning

confidence: 99%

“…The same strategy is implemented for seeding the EGSB reactors. Nevertheless, availability of granules can be limited and the cost of acquiring and transporting the granules can be substantial [ 11 ], highlighting the interest in methodologies for rapid development of stable granules from affordable and widely available flocculent sludge. For this purpose, the addition of external additives, such as ionic polymers, has been demonstrated to enhance granulation, thus accelerating the start-up [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

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Start-Up of Chitosan-Assisted Anaerobic Sludge Bed Reactors Treating Light Oxygenated Solvents under Intermittent Operation

Torres

Álvarez‐Hornos

Gabaldón

et al. 2021

IJERPH

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Quality of the granular sludge developed during the start-up of anaerobic up-flow sludge bed reactors is of crucial importance to ensure the process feasibility of treating industrial wastewater such as those containing solvents. In this study, the microbial granule formation from suspended-growth biomass was investigated in two chitosan-assisted reactors. These reactors operated mimicking industrial sites working with night closures treating a mixture of ethanol, ethyl acetate, and 1-ethoxy-2-propanol. Each reactor operated under different hydrodynamic regimes typical from UASB (R1: < 0.15 m h-1) and EGSB (R2: 3 m h-1). High soluble COD removal efficiencies (> 90%) accompanied by rapid formation of robust anaerobic granules were achieved at both up-flow velocity levels. After three weeks from the start-up, mean size diameters of 475 µm and 354 µm were achieved for R1 and R2, respectively. The performance of the process was found to be stable for the whole operational period of 106 days treating intermittent OLR up to 13 kg COD m-3 d-1. A memory dose of chitosan at day 42 was beneficial to guarantee good quality of the granules by offsetting the negative impact of intermittent water supply on the granular size. Methanocorpusculum was identified as the dominant archaea at both up-flow velocities. Acetobacterium, Geobacter and Desulfovibrio bacteria were also abundant, demonstrating its role on the degradation of light-oxygenated solvents.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Start-Up of Chitosan-Assisted Anaerobic Sludge Bed Reactors Treating Light Oxygenated Solvents under Intermittent Operation

Torres

Álvarez‐Hornos

Gabaldón

et al. 2021

IJERPH

View full text Add to dashboard Cite

show abstract

“…Bacteria response to alkaline pH perturbations in a full-scale UASB reactor treating dairy wastewater showed that after an accidental pH increase (which affected microbial community structure) the microbial population was able to regain diversity and methanogenic activity [ 58 ]. Granulation fundamentals are not completely understood at the present, despite the number of existing granulation-based treatment plants [ 59 ]. Anaerobic granulation substantially consists of a microbial aggregation where communities are organized into dense and highly-structured aggregates, not necessitating any carrier media [ 59 ].…”

Section: Uasb Hydrodynamics and Microbial Communitymentioning

confidence: 99%

“…Granulation fundamentals are not completely understood at the present, despite the number of existing granulation-based treatment plants [ 59 ]. Anaerobic granulation substantially consists of a microbial aggregation where communities are organized into dense and highly-structured aggregates, not necessitating any carrier media [ 59 ]. Microbial community composition was shown to modify in continuous operations, depending on the treated substrate [ 60 ].…”

Section: Uasb Hydrodynamics and Microbial Communitymentioning

confidence: 99%

Up-Flow Anaerobic Sludge Blanket (UASB) Technology for Energy Recovery: A Review on State-of-the-Art and Recent Technological Advances

2020

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Up-flow anaerobic sludge blanket (UASB) reactor belongs to high-rate systems, able to perform anaerobic reaction at reduced hydraulic retention time, if compared to traditional digesters. In this review, the most recent advances in UASB reactor applications are critically summarized and discussed, with outline on the most critical aspects for further possible future developments. Beside traditional anaerobic treatment of soluble and biodegradable substrates, research is actually focusing on the treatment of refractory and slowly degradable matrices, thanks to an improved understanding of microbial community composition and reactor hydrodynamics, together with utilization of powerful modeling tools. Innovative approaches include the use of UASB reactor for nitrogen removal, as well as for hydrogen and volatile fatty acid production. Co-digestion of complementary substrates available in the same territory is being extensively studied to increase biogas yield and provide smooth continuous operations in a circular economy perspective. Particular importance is being given to decentralized treatment, able to provide electricity and heat to local users with possible integration with other renewable energies. Proper pre-treatment application increases biogas yield, while a successive post-treatment is needed to meet required effluent standards, also from a toxicological perspective. An increased full-scale application of UASB technology is desirable to achieve circular economy and sustainability scopes, with efficient biogas exploitation, fulfilling renewable energy targets and green-house gases emission reduction, in particular in tropical countries, where limited reactor heating is required.

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“…Previously, it was believed that global warming would cause a significant increase in methane emissions from vast wetlands into the atmosphere as a result of melting permafrost. However, the presence of humic compounds (HC) in these territories, as it turned out, can inhibit the release of increase in the stability of the functioning of microorganisms within such self-organized microbial communities [30]. The cells of methanogenic consortia, artificially immobilized in a macroporous cryogel of polyvinyl alcohol (PVA), in their physiological state and metabolic activity are close to natural self-immobilized methanogenic associations [25] and therefore they are interesting to be used as a model of real biosystems in studying the effect of new HC derivatives on consortia and methanogenesis.…”

Section: Introductionmentioning

confidence: 99%

Suppression of Methane Generation during Methanogenesis by Chemically Modified Humic Compounds

et al. 2020

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The introduction of various concentrations of chemically modified humic compounds (HC) with different redox characteristics into the media with free and immobilized anaerobic consortia accumulating landfill gases was studied as approach to their functioning management. For this purpose, quinone (hydroquinone, naphthoquinone or methylhydroquinone) derivatives of HC were synthesized, which made it possible to vary the redox and antioxidant properties of HC as terminal electron acceptors in methanogenic systems. The highest acceptor properties were obtained with potassium humate modified by naphthoquinone. To control possible negative effect of HC on the cells of natural methanogenic consortia, different bioluminescent analytical methods were used. The addition of HC derivatives, enriched with quinonones, to nutrient media at concentrations above 1 g/L decreased the energetic status of cells and the efficiency of the methanogenesis. For the first time, the significant decrease in accumulation of biogas was reached as effect of synthetic HC derivatives, whereas both notable change of biogas composition towards increase in the CO2 content and decrease in CH4 were revealed. Thus, modification with quinones makes it possible to obtain low-potential HC derivatives with strongly pronounced acceptor properties, promising for inhibition of biogas synthesis by methanogenic communities.

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Anaerobic granulation: A review of granulation hypotheses, bioreactor designs and emerging green applications

Cited by 87 publications

References 78 publications

Start-Up of Chitosan-Assisted Anaerobic Sludge Bed Reactors Treating Light Oxygenated Solvents under Intermittent Operation

Start-Up of Chitosan-Assisted Anaerobic Sludge Bed Reactors Treating Light Oxygenated Solvents under Intermittent Operation

Up-Flow Anaerobic Sludge Blanket (UASB) Technology for Energy Recovery: A Review on State-of-the-Art and Recent Technological Advances

Suppression of Methane Generation during Methanogenesis by Chemically Modified Humic Compounds

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