Effects of Pre-Ozonation in Refractory Leachate Treatment by the Biological Activated Carbon Fluidized Bed Process

The purpose of this study is to modify the Fluidized Bed Process. Placing various particle diameters of granular activated carbon, (#20∼#30, #30∼#40, #40∼#50) as a medium in an aeration tank, in which microorganisms can attach and grow, improves the biomass concentration, volumetric loadings and removal efficiency. The continuous supply of substrates allows the thickness of bio-film on the medium to be shifted to a proper state. This is due to a friction force effect between the media and the shear force of the agitated flow. After studying the comparisons, it is concluded that the middle particle size (#30∼#40) is the best of the three particle diameters as a medium, in that it achieves a high biomass concentration, stable treatment and higher efficiency.

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Treatment of a Landfill Leachate Containing Refractory Organics and Ammonium Nitrogen by the Microorganism-Attached Activated Carbon Fluidized Bed Process

Water Science & Technology ◽

10.2166/wst.1992.0646 ◽

1992 ◽

Vol 26 (9-11) ◽

pp. 1999-2002 ◽

Cited By ~ 11

Author(s):

N. Iwami ◽

A. Imai ◽

Y. Inamori ◽

R. Sudo

Keyword(s):

Activated Carbon ◽

Mass Balance ◽

Fluidized Bed ◽

Landfill Leachate ◽

Ammonium Nitrogen ◽

High Concentration ◽

Operation Period ◽

Highly Effective ◽

Fluidized Bed Process ◽

Refractory Organics

The microorganism-attached activated carbon fluidized bed (MAACFB) process was applied to treat a landfill leachate containing refractory organics and a high concentration of ammonium nitrogen. The MAACFB process removed about 60 % and 70 % of refractory organics and nitrogen, respectively, from the landfill leachate simultaneously and steadily over a more than 700 days of operation period. A mass balance on organics around the MAACFB process revealed that more than 90 % of the removed organics may be biodegraded. It was suggested that the MAACFB process is highly effective in biodegrading the refractory organics in landfill leachate.

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

Water Science & Technology Water Supply ◽

10.2166/ws.2004.0088 ◽

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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New Biology for Advanced Wastewater Treatment

Water Science & Technology ◽

10.2166/wst.1999.0585 ◽

1999 ◽

Vol 40 (4-5) ◽

pp. 137-144 ◽

Cited By ~ 6

Author(s):

K. Miserez ◽

S. Philips ◽

W. Verstraete

Keyword(s):

Wastewater Treatment ◽

Activated Carbon ◽

Organic Carbon ◽

Genetically Modified Organisms ◽

New Technologies ◽

Chemical Oxidation ◽

Advanced Treatment ◽

Biological Activated Carbon ◽

Catabolic Potential ◽

New Biology

A number of new technologies for the advanced treatment of wastewater have recently been developed. The oxidative cometabolic transformation by methanotrophs and by nitrifiers represent new approaches in relation to organic carbon. The Biological Activated Carbon Oxidative Filters characterized by thin biofilms are also promising in that respect. Moreover, implementing genetically modified organisms with improved catabolic potential in advanced water treatment comes into perspective. For very refractory effluents chemical support techniques, like e.g. strong chemical oxidation, can be lined up with advanced biology.

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