The usage of dried activated sludge and fly ash wastes in phenol biosorption/adsorption: Comparison with granular activated carbon

1999 ◽  
Vol 34 (9) ◽  
pp. 1777-1796 ◽  
Author(s):  
Z. Aksu ◽  
J. Yener
Keyword(s):  
Activated Carbon ◽  
Fly Ash ◽  
Activated Sludge ◽  
Granular Activated Carbon

Fly Ash for Colour Removal from Synthetic Dye Solutions

1999 ◽  
Vol 34 (3) ◽  
pp. 505-518 ◽  
Author(s):  
T. Viraraghavan ◽  
K.R. Ramakrishna
Keyword(s):  
Activated Carbon ◽  
Fly Ash ◽  
Granular Activated Carbon ◽  
Particle Sizes ◽  
Colour Removal ◽  
First Order ◽  
Synthetic Dye ◽  
Removal Capacity ◽  
Acid Blue ◽  
Dye Solutions

Abstract Fly ash was investigated for its ability to adsorb dyes from aqueous solutions. Batch pH, kinetic and isotherm studies were performed on a laboratory scale with synthetic dye solutions made up of four different commercial grade dyes. Fly ash samples with differing compositions and particle sizes were employed to understand the effect of fly ash composition and particle size on their dye removal capacity. The first-order rate equation by Lagergren was tested on the kinetic data, and isotherm data was analyzed for possible agreement with the Langmuir and Freundlich adsorption isotherm equations. The removal capacity of fly ash for the different dyes was compared with that of granular activated carbon under identical conditions. Results showed that fly ash exhibited reasonably good dye removals for Basic Blue 9, Acid Blue 29 and Acid Red 91, while the removals by fly ash exceeded that of granular activated carbon for Disperse Red 1. Lime content in fly ash seemed to influence dye adsorption to a significant degree — better adsorption was observed at lower particle sizes because of the increased external surface area available for adsorption. Acid Blue 29 adsorption by fly ash provided the best fit for the Lagergren first-order plot. Because high pH and heavy metals (leached from fly ash) in the treated wastewater may exceed the limits set in municipal sewer-use bylaws, engineering and economic feasibility assessment should include these aspects when considering fly ash for colour removal.

Dye removal using low cost adsorbents

1997 ◽  
Vol 36 (2-3) ◽  
pp. 189-196 ◽  
Author(s):  
Konduru R. Ramakrishna ◽  
T. Viraraghavan
Keyword(s):  
Activated Carbon ◽  
Fly Ash ◽  
Dye Removal ◽  
Low Cost ◽  
Treatment Options ◽  
Granular Activated Carbon ◽  
Isotherm Models ◽  
Disperse Dyes ◽  
Acid Dyes ◽  
Column Studies

Dyestuff production units and dyeing units have always had a pressing need for techniques that allow economical pretreatment for color in the effluent. The effectiveness of adsorption for dye removal from wastewaters has made it an ideal alternative to other expensive treatment options. The current paper deals with an investigation on four low-cost adsorbents locally available in Saskatchewan, Canada for dye removal. Peat, steel plant slag, bentonite clay and fly ash were utilized for this study and their performance evaluated against that of granular activated carbon. Batch kinetic and isotherm studies, and column studies were undertaken, and the data evaluated for compliance with the Langmuir, Freundlich and BET isotherm models. Synthetic dye wastewaters prepared from commercial grade acid, basic and disperse dyes were used in this study and the results showed high removals of acid dyes by fly ash and slag while peat and bentonite exhibited high basic dye removals. For the acid and basic dyes, the removals were comparable with that of granular activated carbon, while for the disperse dyes, the performance was much better than that of granular activated carbon. The results obtained point towards viable adsorbents which are both effective as well as economically attractive for color removal from wastewaters.

Quinoline adsorption onto granular activated carbon and bagasse fly ash

2012 ◽  
Vol 181-182 ◽  
pp. 343-351 ◽  
Author(s):  
D. Rameshraja ◽  
Vimal Chandra Srivastava ◽  
Jai Prakash Kushwaha ◽  
Indra Deo Mall
Keyword(s):  
Activated Carbon ◽  
Fly Ash ◽  
Granular Activated Carbon ◽  
Bagasse Fly Ash

Kinetics for Sulfate Removal in Tannery Wastewater by Immobilized Activated Sludge

2011 ◽  
Vol 356-360 ◽  
pp. 1135-1138
Author(s):  
Chang Qing Zhao ◽  
Qin Huan Yang ◽  
Wu Yong Chen
Keyword(s):  
Activated Carbon ◽  
Activated Sludge ◽  
Granular Activated Carbon ◽  
Reduction Product ◽  
Dynamic Equations ◽  
Tannery Wastewater ◽  
Anaerobic Sludge ◽  
Sulfate Removal ◽  
Aerobic Sludge

The anaerobic activated sludge inoculated with an isolated SRB was immobilized on the granular activated carbon and the kinetics for the immobilized anaerobic sludge treating the sulfate in tannery wastewater was studied. Also, the aerobic activated sludge containing enriched SOB was immobilized and the kinetics for the sulfur conversion was studied with the immobilized aerobic sludge through treating sulfide (the reduction product of SO42-) in tannery wastewater. The results showed that the kinetics for treating SO42-with the immobilized SRB in the actual tannery wastewater could be expressed as follows: lnC =-0.04941 t+6.79764. The kinetics for the sulfur conversion with the immobilized SOB through treating the sulfide in the actual tannery wastewater could be expressed as follows: lnC =0.01109 t+3.09996. The established dynamic equations could predict the capacity of sulfate removal and sulfur conversion in tannery wastewater.

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