Sorption of Organic Contaminants by Fly Ash in a Single Solute System

Banerjee, Kashi; Cheremisinoff, Paul N.; Cheng, Su

doi:10.1021/es00009a014

Cited by 58 publications

(40 citation statements)

References 4 publications

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“…The carbon content of fly ash plays a significant role during the adsorption of organic compounds (Banerjee et al, 1995). The adsorption capacity of an adsorbent was found to increase with its carbon content.…”

Section: Introductionmentioning

confidence: 96%

Chemical Oxygen Demand (COD) Reduction in Domestic Wastewater by Fly Ash and Brick Kiln Ash

Devi

Dahiya

2006

Water Air Soil Pollut

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The potential of fly ash, brick kiln ash and commercial activated carbon is determined for the reduction of chemical oxygen demand (COD) from domestic wastewater. Laboratory experiments are conducted for investigating the effect of treatment time, adsorbent dose, pH of the media, initial COD concentration, agitation speed and particle size of adsorbents on the COD reduction from the domestic wastewater. Starting with an initial COD concentration of 1080 mg/l the maximum COD reduction achieved for fly ash was 87.84%, brick kiln ash was 83.22% and commercial activated carbon was 99.35 %. These values were achieved when the wastewater was treated with activated carbon for 180 min, fly ash 250 min and brick kiln ash 300 min and the adsorbent dose was kept respectively at 40 g/l, 60 g/l and 45 g/l for activated carbon, fly ash and brick kiln ash. Agitation speed was kept constant at 600 rpm and the pH was maintained at 2 for activated carbon and fly ash and 5 for brick kiln ash. The maximum percent reduction is for 0.053 mm for smaller size of the particles. Though the adsorption capacity of the ash for reducing the COD is lower than that of the commercial activated carbon, the low material cost can make it an attractive option for the treatment of domestic wastewater.

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Section: Introductionmentioning

confidence: 96%

Chemical Oxygen Demand (COD) Reduction in Domestic Wastewater by Fly Ash and Brick Kiln Ash

Devi

Dahiya

2006

Water Air Soil Pollut

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“…fly ash and slag) is widely accepted due to the reduced environmental impact and improved material properties such as lower permeability, better buffering capacity and reduced leachability (Weng and Huang, 1994;Dermatas and Meng, 2003). Additionally, the residual carbon content in fly ash plays a significant role in adsorbing organic contaminants, reducing their mobility as reported in (Low and Batley, 1988;Banerjee et al, 1995). Industrial adsorbents such as activated carbon and inorgano-organo-clays (IOC) also received significant attention and have shown promise for immobilising organics in the S/S techniques (Pollard et al, 1991) but their long-term effect on the final waste forms and their compatibility with different binder formulations have yet to be validated.…”

Section: Introductionmentioning

confidence: 99%

Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders

2016

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A new group of MgO-bearing binders has been developed recently which showed improved sustainability and technical performance compared to Portland cement (PC). However, the application of these MgO-bearing binders in the Solidification/Stabilisation (S/S) techniques is very limited. This study investigates the three-year performance of a highly contaminated soil treated by in-situ S/S using MgO-bearing binders and PC. The core quality, strength, permeability and the leaching properties of the S/S materials were evaluated. The effects of binder composition, addition of inorgano-organo-clay (IOC) and the grout content on the properties of the 3-y S/S materials are discussed. It is found that although MgO alone provided negligible strength to the soil, it is superior in immobilising both inorganic and organic contaminants. Replacing MgO by ground granulated blast-furnace slag (GGBS) significantly enhanced the strength while also performed well in immobilising the contaminants. The improved pH buffering capacity was attributed to the low solubilities of brucite and hydrotalcite-like phases formed in the MgO-bearing binders, and was also the reason for the improved performance in stabilising contaminants. The addition of IOC slightly decreased the strength and the permeability of the S/S materials but inconsistent effect on the contaminant immobilisation was found depending on the binder composition. This study showed no degradation of the S/S materials after 3 y exposure to field conditions and has proved the applicability and the advantages of MgO-bearing binders over PC in S/S.

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“…Physical adsorption may only transfer pollutants to other media without further degradation [5] and biologic treatment might be ineffective due to its relatively low degradation rate [6]. Advanced Oxidation Processes (AOP), which overcomes the deficiencies of traditional treatment, has been studied extensively including UV/H 2 O 2 , PhotoFenton Process, ozonation, and photocatalysis [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effects of humic acid and H2O2 on the photocatalytic degradation of atrazine assisted by microwave

Qin

Yang

Sun

et al. 2010

Front. Environ. Sci. Eng. China

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A solution of atrazine in a TiO 2 suspension, an endocrine disruptor in natural water, was tentatively treated by microwave-assisted photocatalytic technique. The effects of mannitol, oxygen, humic acid, and hydrogen dioxide on the photodegradation rate were explored. The results could be deduced as follows: the photocatalytic degradation of atrazine fits the pseudo-first-order kinetic well with k = 0.0328 s -1 , and $OH was identified as the dominant reactant. Photodegradation of atrazine was hindered in the presence of humic acid, and the retardation effect increased as the concentration of humic acid increased. H 2 O 2 displayed a significant negative influence on atrazine photocatalysis efficiency. Based on intermediates identified with gas chromatography-mass spectrometry (GC-MS) and Liquid chromatography-mass spectrometry (LC-MS/MS) techniques, the main degradation routes of atrazine are proposed.

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Sorption of Organic Contaminants by Fly Ash in a Single Solute System

Cited by 58 publications

References 4 publications

Chemical Oxygen Demand (COD) Reduction in Domestic Wastewater by Fly Ash and Brick Kiln Ash

Chemical Oxygen Demand (COD) Reduction in Domestic Wastewater by Fly Ash and Brick Kiln Ash

Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders

Investigation of the effects of humic acid and H2O2 on the photocatalytic degradation of atrazine assisted by microwave

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