Anaerobic degradation of glycol ether-ethanol mixtures using EGSB and hybrid reactors: Performance comparison and ether cleavage pathway

Ferrero, Pablo; San‐Valero, Pau; Gabaldón, Carmen; Martínez‐Soria, Vicente; Penya-Roja, J. M.

doi:10.1016/j.jenvman.2018.02.070

Cited by 13 publications

(3 citation statements)

References 32 publications

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“…The change to continuous feeding caused an accumulation of E2P in R1, but at the end of the study E2P removal was > 80%. Intermediate products associated with the anaerobic degradation pathway of E2P are acetone from the ether cleavage and isopropanol from the reversible reduction of acetone in the presence of H 2 [ 27 ]. Both intermediates were detected at low concentrations (acetone < 30 mg COD L −1 ; isopropanol < 20 mg COD L −1 ), thus indicating that the production of the enzyme required for ether cleavage was the limiting step.…”

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

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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%

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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“…[14][15][16] The anaerobic hybrid (AH) reactor has a unique configuration, as it integrates the advantages of the UASB and anaerobic filter (AF) reactors for its lower and upper zones, respectively. [17][18][19][20] The supporting media (such as nylon fiber, polyurethane foam or plastic cut rings) are installed at the upper part of the AH reactor, acting as a packed zone, whereas microbial granulation occurs in the sludge zone (bottom part) of the reactor, similar to that in the UASB reactor. The packed zone of the AH reactor is considered the zone for microbial attachment in the form of biofilms.…”

Section: Introductionmentioning

confidence: 99%

Efficiencies of anaerobic hybrid and UASB reactors to alleviate the adverse effect of elevated salinity in wastewater

Hudayah

Krainara

Kongduan

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Untreated high-strength salinity wastewaters pose a serious threat to the environment. Anaerobic treatment is an effective process with double advantages of waste stabilization and energy production. However, high organic compound and sodium toxicity in high-salinity wastewaters adversely affect the performance of anaerobic treatment. In this study, anaerobic hybrid (AH) and upflow anaerobic sludge blanket (UASB) reactors were investigated for their efficiencies to alleviate the negative effects of high-salinity wastewater.RESULTS: Double increases in the NaCl concentration drastically deteriorated the performances of both reactors. The activities of acetoclastic methanogens (ACM) and hydrogenotrophic methanogens (HTM) in both reactors decreased to 22-28% and 36-40% compared to the previous period, respectively. However, the methanogen population (Methanosarcinales and Methanobacteriales) was not affected negatively. The AH reactor exhibited excellent performance during the recovery and restart periods, which only required 7 days to complete the recovery period. Furthermore, during the restart period, the AH reactor showed high chemical oxygen demand (COD) removal efficiency, methane (CH 4 ) production and yield as ≈90%, 2600 mL day −1 and 0.30 m 3 CH 4 kg −1 COD removed , respectively. The rate of biomass washout from the AH reactor also was lower compared to the UASB reactor. The concentration of attached biomass in the packed zone of the AH reactor gradually increased indicating the growth of an active microbial biofilm. CONCLUSION: The excellent performance of the AH reactor was presumably a result of its packed zone configuration which provided the supporting media to entrap smaller microbial aggregates, reduce biomass washout and support the growth of active biofilm.

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“…Over the last three decades, several research groups have isolated microorganisms capable of attacking PU (Oceguera-Cervantes et al, 2007;Cregut et al, 2013;Álvarez-Barragán et al, 2016;Gamerith et al, 2016;Osman et al, 2018;Magnin et al, 2019) and degrading xenobiotic additives (Ojo, 2007;Varsha et al, 2011). Also, the degradation capabilities of several fungal and bacterial communities over PU in compost, soil or liquid cultures (Zafar et al, 2014;Shah et al, 2016;Vargas-Suárez et al, 2019), and over some xenobiotics in different activated sludges (Ferrero et al, 2018) have been assessed. However, PU biodegradation is still a challenge for environmental and biological disciplines and little is known about structure or potential degradative enzymatic pathways of microbial communities capable of PU biodegradation.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Recalcitrant Polyurethane and Xenobiotic Additives by a Selected Landfill Microbial Community and Its Biodegradative Potential Revealed by Proximity Ligation-Based Metagenomic Analysis

et al. 2020

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Polyurethanes (PU) are the sixth most produced plastics with around 18-million tons in 2016, but since they are not recyclable, they are burned or landfilled, generating damage to human health and ecosystems. To elucidate the mechanisms that landfill microbial communities perform to attack recalcitrant PU plastics, we studied the degradative activity of a mixed microbial culture, selected from a municipal landfill by its capability to grow in a water PU dispersion (WPUD) as the only carbon source, as a model for the BP8 landfill microbial community. The WPUD contains a polyether-polyurethane-acrylate (PE-PU-A) copolymer and xenobiotic additives (N-methylpyrrolidone, isopropanol and glycol ethers). To identify the changes that the BP8 microbial community culture generates to the WPUD additives and copolymer, we performed chemical and physical analyses of the biodegradation process during 25 days of cultivation. These analyses included Nuclear magnetic resonance, Fourier transform infrared spectroscopy, Thermogravimetry, Differential scanning calorimetry, Gel permeation chromatography, and Gas chromatography coupled to mass spectrometry techniques. Moreover, for revealing the BP8 community structure and its genetically encoded potential biodegradative capability we also performed a proximity ligation-based metagenomic analysis. The additives present in the WPUD were consumed early whereas the copolymer was cleaved throughout the 25-days of incubation. The analysis of the biodegradation process and the identified biodegradation products showed that BP8 cleaves esters, CC , and the recalcitrant aromatic urethanes and ether groups by hydrolytic and oxidative mechanisms, both in the soft and the hard segments of the copolymer. The proximity ligation-based metagenomic analysis allowed the reconstruction of five genomes, three of them from novel species. In the metagenome,

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Anaerobic degradation of glycol ether-ethanol mixtures using EGSB and hybrid reactors: Performance comparison and ether cleavage pathway

Cited by 13 publications

References 32 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

Efficiencies of anaerobic hybrid and UASB reactors to alleviate the adverse effect of elevated salinity in wastewater

Degradation of Recalcitrant Polyurethane and Xenobiotic Additives by a Selected Landfill Microbial Community and Its Biodegradative Potential Revealed by Proximity Ligation-Based Metagenomic Analysis

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