The study of structure of anaerobic granules and methane producing pathways of pilot-scale UASB reactors treating municipal wastewater under sub-mesophilic conditions

Owusu-Agyeman, Isaac; Eyice, Özge; Cetecioglu, Zeynep; Płaza, Elżbieta

doi:10.1016/j.biortech.2019.121733

Cited by 41 publications

(18 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, the abundance of the family Anaerolineaceae also coincides with the Bray–Curtis clustering, thus this family could be an indicator bacteria for high organic enrichment associated with aquaculture operations. A proposal associated with its metabolic activity as an anaerobic fermenter involved in sulphate‐reducing conditions and also involved in methanogenic consortia (Matturro et al., 2017; Owusu‐Agyeman et al., 2019). Taking all above into consideration, the relative abundance of some families, Anaerolineaceae, Desulfobacteraceae, Desulfobulbaceae, Sulfurovaceae and Thiotrichaceae , could be good markers of benthic impact at marine salmon farms.…”

Section: Discussionmentioning

confidence: 99%

Taxonomy and diversity of bacterial communities associated with marine sediments from Chilean salmonid farms

Miranda

Aguila‐Torres

Aranda

et al. 2020

Aquaculture Research

View full text Add to dashboard Cite

A marine sediment survey beneath four salmon farms in southern Chile was conducted. 16S rRNA pyrosequencing‐based analysis was used to study the taxonomy and diversity of bacterial communities in sediments. Samples were taken under farm cages (study site) and reference (control) sites at different seasons and productive periods. Families associated with phyla Proteobacteria and Bacteroidetes were the most abundant, representing on average 50.7% of the total bacterial community. Flavobacteriaceae was the single family observed in all samples and also the most abundant. Bacterial diversity and richness indices (Chao1, Shannon and PD) at the study sites during productive periods showed a broader range of values than those measured in control or resting stage samples. Also, a very low number of shared families (2/54), compared with those taken at control (13/31) and resting stages (13/45), was observed. Bray–Curtis clustering of libraries resulted in two main clades, one mainly represented by samples of the study site and productive states, dominated by Sulfurovum with low values for bacterial diversity and richness indices and a community structure related to sulphidic sediments, while the other clades, mainly composed by control and resting samples, resulted dominated by Flavobacteriaceae and exhibited higher values of diversity and richness.

show abstract

Section: Discussionmentioning

confidence: 99%

Taxonomy and diversity of bacterial communities associated with marine sediments from Chilean salmonid farms

Miranda

Aguila‐Torres

Aranda

et al. 2020

Aquaculture Research

View full text Add to dashboard Cite

show abstract

“…At the genus level of bacteria, Paludibacter was the only one to maintain its relative abundance at values around 2.0% in all samples. This genus that involves fermentative bacteria producing propionate from a wide range of substrates [ 52 , 53 ] has been reported with similar abundances in granules treating municipal wastewater at temperatures around 20 °C [ 54 ]. In addition, three abundant genera in the granules were Acetobacterium , Geobacter , and Desulfovibrio , which increased considerably in relative abundance after 106 days of operation from values in the inoculum lower than 0.2%.…”

Section: Resultsmentioning

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

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.

show abstract

“…Beside upward velocity, intermittent gas sparging could be an effective way to promote liquid shear, altering granule surface structure [ 56 ]. The detailed microscopical analysis of granule structure demonstrated that larger granules (3–4 mm diameter) have multi-layered internal microstructures, with more consistent methanogenic activity than smaller granules (1–2 mm diameter) [ 57 ]. Granular sludge was shown to have superior performances than thickened digestate and anaerobic sewage in UASB reactors [ 35 ].…”

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

View full text Add to dashboard Cite

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.

show abstract

The study of structure of anaerobic granules and methane producing pathways of pilot-scale UASB reactors treating municipal wastewater under sub-mesophilic conditions

Cited by 41 publications

References 43 publications

Taxonomy and diversity of bacterial communities associated with marine sediments from Chilean salmonid farms

Taxonomy and diversity of bacterial communities associated with marine sediments from Chilean salmonid farms

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

Contact Info

Product

Resources

About