Anaerobic Degradation of Digestate Based Hydrothermal Carbonization Products in a Continuous Hybrid Fixed Bed Anaerobic Filter

2021 ◽  
pp. 124971
Author(s):  
Mostafa Ahmed ◽  
Fabio Sartori ◽  
Fabio Merzari ◽  
Luca Fiori ◽  
Sherien Elagroudy ◽  
...  
Keyword(s):  
Anaerobic Degradation ◽  
Fixed Bed ◽  
Hydrothermal Carbonization ◽  
Anaerobic Filter

scholarly journals Anaerobic Degradation of Individual Components from 5-Hydroxymethylfurfural Process-Wastewater in Continuously Operated Fixed Bed Reactors

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 677
Author(s):  
Muhammad Tahir Khan ◽  
Johannes Krümpel ◽  
Dominik Wüst ◽  
Andreas Lemmer
Keyword(s):  
Levulinic Acid ◽  
Anaerobic Degradation ◽  
Fixed Bed ◽  
Methane Yield ◽  
Process Stability ◽  
Anaerobic Process ◽  
Anaerobic Filter ◽  
Fixed Bed Reactors ◽  
Process Wastewater ◽  
By Products

Production of bio-based materials in biorefineries is coupled with the generation of organic-rich process-wastewater that requires further management. Anaerobic technologies can be employed as a tool for the rectification of such hazardous by-products. Therefore, 5-hydroxymethylfurfural process-wastewater and its components were investigated for their biodegradability in a continuous anaerobic process. The test components included 5-hydroxymethylfurfural, furfural, levulinic acid, and the full process-wastewater. Each component was injected individually into a continuously operating anaerobic filter at a concentration of 0.5 gCOD. On the basis of large discrepancies within the replicates for each component, we classified their degradation into the categories of “delayed”, “retarded”, and “inhibitory”. Inhibitory represented the replicates for all the test components that hampered the process. For the retarded degradation, their mean methane yield per 0.5 gCOD was between 21.31 ± 13.04 mL and 28.98 ± 25.38 mL. Delayed digestion was considered adequate for further assessments in which the order of conversion to methane according to specific methane yield for each component from highest to lowest was as follows: levulinic acid > furfural > 5-hydroxymethylfurfural > process-wastewater. Disparities and inconsistencies in the degradation of process-wastewater and its components can compromise process stability as a whole. Hence, the provision of energy with such feedstock is questionable.

scholarly journals A novel anaerobic filter membrane bioreactor: prototype start-up and filtration assays

2018 ◽  
Vol 78 (9) ◽  
pp. 1833-1842 ◽  
Author(s):  
V. Diez ◽  
A. Iglesias ◽  
J. M. Cámara ◽  
M. O. Ruiz ◽  
C. Ramos
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Fixed Bed ◽  
Biomass Concentration ◽  
Organic Loading Rate ◽  
Cycle Duration ◽  
Concentrated Suspension ◽  
Efficient Treatment ◽  
Anaerobic Filter ◽  
Filter Membrane

Abstract Anaerobic digestion allows efficient treatment of high loaded wastewater, and membrane technology allows obtaining high quality effluents with complete biomass retention. However, high biomass concentration interferes with membrane fouling. In the present work, a new bioreactor that integrates an attached biomass anaerobic culture on a fixed bed and a submerged membrane has been started up. The recirculation between the digestion and filtration chambers is coupled to the gas-lift effect of the bubbling employed for the scouring of the membranes, avoiding the use or electromechanical pumps that damage the suspended biomass. The support material retains the biomass in the digestion tank despite the downwards flow, avoiding the submerged membrane contacting with a high concentrated suspension. This novel system, called an anaerobic filter membrane bioreactor was immediately started up, achieving chemical oxygen demand (COD) removal efficiencies of 96% at an organic loading rate (OLR) of 7 kg COD/m3·d. In order to select filtration flux, specific gas demand and filtration cycle duration, the results of 15 short term assays, eight hours for each one, is presented for fluxes between 15.7 and 17.7 L/m2·h, cycle duration between 10 and 30 minutes, and three levels of scouring. It was checked that reversible and irreversible fouling were directly related when dTMP/dt > 2.5 mbar/min.

Efficient removal of crystal violet by diatomite and carbon in the fixed bed column: influence of different glucose/diatomite

RSC Advances ◽  
2016 ◽  
Vol 6 (56) ◽  
pp. 51337-51346 ◽  
Author(s):  
Yanzhuo Zhang ◽  
Jun Li ◽  
Xiaojie Cheng ◽  
Wei Bian ◽  
Guanghui Chen ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Fixed Bed ◽  
Hydrothermal Carbonization ◽  
Efficient Removal ◽  
Fixed Bed Column ◽  
The Way

This study investigated the way in which the modified adsorbent diatomite earth and glucose (DE & C) content affects the removal of crystal violet (CV) from water using a fixed bed column during hydrothermal carbonization.

Anaerobic degradation of landfill leachate using an upflow anaerobic fixed-bed reactor with microbial sulfate reduction

2009 ◽  
Vol 167 (1-3) ◽  
pp. 1133-1140 ◽  
Author(s):  
Olfa Ben Dhia Thabet ◽  
Hassib Bouallagui ◽  
Jean-luc Cayol ◽  
Bernard Ollivier ◽  
Marie-Laure Fardeau ◽  
...  
Keyword(s):  
Sulfate Reduction ◽  
Landfill Leachate ◽  
Anaerobic Degradation ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Microbial Sulfate Reduction

Kinetics of anaerobic degradation of screened dairy manure by upflow fixed bed digesters: Effect of natural zeolite addition

2009 ◽  
Vol 44 (2) ◽  
pp. 146-154 ◽  
Author(s):  
S. Nikolaeva ◽  
E. Sánchez ◽  
R. Borja ◽  
F. Raposo ◽  
M. F. Colmenarejo ◽  
...  
Keyword(s):  
Natural Zeolite ◽  
Anaerobic Degradation ◽  
Fixed Bed ◽  
Dairy Manure ◽  
Kinetics Of

Kinetic evaluation and process performance of an upflow anaerobic filter reactor degrading terephthalic acid

2014 ◽  
Vol 69 (12) ◽  
pp. 2562-2569 ◽  
Author(s):  
Orkun I. Davutluoglu ◽  
Galip Seckin
Keyword(s):  
Terephthalic Acid ◽  
Anaerobic Degradation ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Reactor Performance ◽  
Kinetic Evaluation ◽  
Anaerobic Filter

The anaerobic degradation of terephthalic acid (TA) as the sole organic carbon source was studied in an upflow anaerobic filter (UAF) reactor. The reactor was seeded with biomass obtained from a full-scale upflow anaerobic sludge bed (UASB) reactor and was used to treat wastewater from a petrochemical facility producing dimethyl terephthalate. The UAF reactor was operated for 252 d with a constant hydraulic retention time of 24 h, and the organic loading rate (OLR) was gradually increased from 1 to 10 g-chemical oxygen demand (COD)/L d. After a lag period of approximately 40 d, the COD removal efficiency increased exponentially and high removal rate values (≈90%) were obtained, except for at highest OLR (10 g-COD/L d). The high removal rates and the robustness of the reactor performance could be attributed to the formation of biofilm as well as granular sludge. The methane production rates (0.22 to 2.15 L/d) correlated well with the removed OLRs (0.3 to 6.8 g-COD/L d) during the various phases of treatment, indicating that the main mechanism of TA degradation occurs via methanogenic reactions. The average methane content of the produced biogas was 70.3%. The modified Stover–Kincannon model was found to be applicable for the anaerobic degradation of TA in UAFs (Umax = 64.5, KB = 69.1 g-COD/L d and Ymax = 0.27 L-CH4/g-CODremoved). These results suggest that UAF reactors are among the most effective reactor configurations for the anaerobic degradation of TA.

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