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Removal of PCBs from wastewater using fly ash.
Chemosphere. 2003 Nov; 53(6):655-65.C

Abstract

Liquids and sludges containing polychlorinated biphenyls (PCBs) can be treated to concentrate the PCBs in a solid residue. The latter can then be handled to destroy the PCBs. A study on sorption kinetics of PCBs on fly ash was conducted in controlled batch systems. TCB and HeCB are removed at 25 degrees C by adsorption on fly ash up to 97% at pH 7, with an adsorbent dose of 5 g/l. An examination of the thermodynamic parameters shows that the adsorption of TCB and HeCB by fly ash is a process occurring spontaneously at ambient conditions. Activation energies for the sorption process ranged between 5.6 and 49.1 kJ/mol. It was observed that the rate at which TCB and HeCB are adsorbed onto fly ash showed a diffusion limitation. The uptake rate of TCB and HeCB increases with increasing initial concentration and gradually tends to a constant value. A decrease in the adsorption of TCB and HeCB was observed when interfering ions and other PCB congeners were present. Changing the pH in the aqueous solution from 2 to 10 had no effect on the adsorption process. Overall, fly ash can be used for an efficient removal of PCBs from several aqueous solutions.

Authors+Show Affiliations

Nollet H
Laboratory of Microbial Ecology and Technology, Faculty of Agricultural and Applied Biological Sciences, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium.
Roels M
No affiliation info available
Lutgen P
No affiliation info available
Van der Meeren P
No affiliation info available
Verstraete W
No affiliation info available

MeSH

AdsorptionCarbonCoalCoal AshHydrogen-Ion ConcentrationIndustrial WasteIonsKineticsParticulate MatterPolychlorinated BiphenylsTemperatureThermodynamicsWaste Disposal, FluidWater PollutantsWater Purification

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12962715

Citation

Nollet, Hendrik, et al. "Removal of PCBs From Wastewater Using Fly Ash." Chemosphere, vol. 53, no. 6, 2003, pp. 655-65.
Nollet H, Roels M, Lutgen P, et al. Removal of PCBs from wastewater using fly ash. Chemosphere. 2003;53(6):655-65.
Nollet, H., Roels, M., Lutgen, P., Van der Meeren, P., & Verstraete, W. (2003). Removal of PCBs from wastewater using fly ash. Chemosphere, 53(6), 655-65.
Nollet H, et al. Removal of PCBs From Wastewater Using Fly Ash. Chemosphere. 2003;53(6):655-65. PubMed PMID: 12962715.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Removal of PCBs from wastewater using fly ash. AU - Nollet,Hendrik, AU - Roels,Murielle, AU - Lutgen,Pierre, AU - Van der Meeren,Paul, AU - Verstraete,Willy, PY - 2003/9/10/pubmed PY - 2003/12/3/medline PY - 2003/9/10/entrez SP - 655 EP - 65 JF - Chemosphere JO - Chemosphere VL - 53 IS - 6 N2 - Liquids and sludges containing polychlorinated biphenyls (PCBs) can be treated to concentrate the PCBs in a solid residue. The latter can then be handled to destroy the PCBs. A study on sorption kinetics of PCBs on fly ash was conducted in controlled batch systems. TCB and HeCB are removed at 25 degrees C by adsorption on fly ash up to 97% at pH 7, with an adsorbent dose of 5 g/l. An examination of the thermodynamic parameters shows that the adsorption of TCB and HeCB by fly ash is a process occurring spontaneously at ambient conditions. Activation energies for the sorption process ranged between 5.6 and 49.1 kJ/mol. It was observed that the rate at which TCB and HeCB are adsorbed onto fly ash showed a diffusion limitation. The uptake rate of TCB and HeCB increases with increasing initial concentration and gradually tends to a constant value. A decrease in the adsorption of TCB and HeCB was observed when interfering ions and other PCB congeners were present. Changing the pH in the aqueous solution from 2 to 10 had no effect on the adsorption process. Overall, fly ash can be used for an efficient removal of PCBs from several aqueous solutions. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/12962715/Removal_of_PCBs_from_wastewater_using_fly_ash_ DB - PRIME DP - Unbound Medicine ER -