Biological activated carbon in fluidized bed reactors for the treatment of groundwater contaminated with volatile aromatic hydrocarbons

1992 ◽  
Vol 26 (10) ◽  
pp. 1389-1401 ◽  
Author(s):  
T VOICE ◽  
D PAK ◽  
X ZHAO ◽  
J SHI ◽  
R HICKEY
Keyword(s):  
Activated Carbon ◽  
Fluidized Bed ◽  
Aromatic Hydrocarbons ◽  
Fluidized Bed Reactors ◽  
Biological Activated Carbon

Use of activated carbon and natural zeolite as support materials, in an anaerobic fluidised bed reactor, for vinasse treatment

2001 ◽  
Vol 44 (4) ◽  
pp. 1-6 ◽  
Author(s):  
N. Fernández ◽  
F. Fdz-Polanco ◽  
S. J. Montalvo ◽  
D. Toledano
Keyword(s):  
Organic Matter ◽  
Activated Carbon ◽  
Fluidized Bed ◽  
Natural Zeolite ◽  
Cane Sugar ◽  
Raw Material ◽  
Organic Loading Rate ◽  
Fluidized Bed Reactors ◽  
Fluidised Bed ◽  
Support Materials

In Cuba, the alcohol distillation process from cane sugar molasses, produces a final waste (vinasse), with an enormous polluting potential and a high sulfate content. Applying the anaerobic technology, most of the biodegradable organic matter can turn into biogas, rich in methane but with concentrations of sulfide above 1%. The present work develops two experiences with anaerobic fluidized bed reactors (AFBR) using both Cuban raw material, activated carbon and natural zeolite, as support media, with the purpose of obtaining high organic matter removal rates and keeping sulfide and ammonium concentrations in the permissible ranges. The reactors were operated during 120 days, achieving an organic loading rate of 10 kg COD/m3 day, with COD removal above 70%, and a methane production of 2 L/d. The activated carbon and natural zeolite used support materials in anaerobic fluidized bed reactors, and showed good results of distillery waste removal.

Adsorption of Toxic Shocks on Carriers in Anaerobic Biofilm Fluidized Bed Reactors

1993 ◽  
Vol 28 (2) ◽  
pp. 55-65 ◽  
Author(s):  
N. Mol ◽  
O. M. Kut ◽  
I. J. Dunn
Keyword(s):  
Activated Carbon ◽  
Fluidized Bed ◽  
Gas Production ◽  
Fluidized Bed Reactors ◽  
Methane Formation ◽  
Toxic Shock ◽  
Original Activity ◽  
Phenol Adsorption ◽  
Carrier Materials ◽  
The Individual

The influence of different carrier materials on the performance of single stage anaerobic biofilm fluidized bed reactors by toxic shock loadings was studied in parallel experiments. The carrier materials investigated were porous glass (Siran), quartz sand, pumice, shale, activated carbon and anthracite. Since the composition and morphology of the biofilm is influenced by the individual wastewater, vapor condensate from a sulfite cellulose process and mixed brewery wastewaters were used as substrates. The phenol adsorption characteristics were measured on bare and biofilm-coated carriers. Biofilm-coated carriers adsorbed larger amounts of phenol than bare carriers. It was observed that the biofilm morphology and the corresponding adsorption capacity of biofilm carriers depended on the individual wastewater characteristics. It was also shown that activated carbon (and partly anthracite) adsorbed large amounts of phenol, mostly irreversibly. The performance of the individual reactors was studied under short-term dynamic phenol shocks (constant hydraulic retention time (HRT) 10 h, loading rate increase from 12 to 20 kg COD/m3d during the shock period of ca.10 h). During the toxic loading in continuous operation, an increase of phenol concentration was observed in the effluent, coupled with an up to 20% decrease in the gas production rates. During this period, acetic acid accumulation was also observed, indicating the inhibition of methane formation. Following the shock, all reactors showed a relatively rapid recovery to the original activity after 2-3 hydraulic retention times.

Role of adsorption in granular activated carbon-fluidized bed reactors

1995 ◽  
Vol 67 (3) ◽  
pp. 302-309 ◽  
Author(s):  
Jing Shi ◽  
Xianda Zhao ◽  
Robert F. Hickey ◽  
Thomas C. Voice
Keyword(s):  
Activated Carbon ◽  
Fluidized Bed ◽  
Granular Activated Carbon ◽  
Fluidized Bed Reactors

Removal of microcystin-LR from drinking water with TiO2-coated activated carbon

2004 ◽  
Vol 4 (5-6) ◽  
pp. 21-28
Author(s):  
S.-C. Kim ◽  
D.-K. Lee
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Synergistic Effect ◽  
Fluidized Bed ◽  
Continuous Flow ◽  
High Surface ◽  
High Surface Area ◽  
Fluidized Bed Reactor ◽  
Exterior Surface ◽  
Tio2 Particles

TiO2-coated granular activated carbon was employed for the removal of toxic microcystin-LR from water. High surface area of the activated carbon provided sites for the adsorption of microcystin-LR, and the adsorbed microcystin-LR migrated continuously onto the surface of TiO2 particles which located mainly at the exterior surface in the vicinity of the entrances of the macropores of the activated carbon. The migrated microcystin-LR was finally degraded into nontoxic products and CO2 very quickly. These combined roles of the activated carbon and TiO2 showed a synergistic effect on the efficient degradation of toxic microcystin-LR. A continuous flow fluidized bed reactor with the TiO2-coated activated carbon could successfully be employed for the efficient photocatalytic of microcystin-LR.

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