Enhancement of removal of organic pollutants from coking wastewater through adsorption by modified coal fly ash

• Autorzy: Tang H. , Liu G.-Z. , Yan Y.-B. , Gong J.-L.
• Języki publikacji: EN

Abstrakty

EN

Potential use of modified coal fly ash (MCFA) has been investigated for adsorption of organic pollutants from coking wastewater (OPs-CW). The surface morpholgy, element profile, BET specific surface area and pore size distributions of MCFA were determined. FT-IR spectrum was used to detect changes of organic functional groups in MCFA after adsorption. The results showed that when the dosage of MCFA was 2.0 g/l at pH of 6.0, 94.2% of COD removal could be achieved after 600 min of agitation at 303 K. The adsorption kinetic of OPs-CW onto MCFA was fit well to the pseudo-second order model. The intraparticle diffusion was identified not to be a sole rate limiting step, and there may also be film diffusion. Freundlich model gave a better fit to all adsorption isotherms than Langmuir. The values of Ea calculated by D-R model are approximately in the range of 8-16 kJ/mol, suggesting that chemical bonding could be more likely to be the main adsorption mechanism. Negative values of ΔG° demonstrate feasibility and spontaneous nature of the adsorptive treatment.

Słowa kluczowe

EN

adsorption; chemical bonds; fly ash; adsorption kinetics; modified coal fly ash; MCFA; coking wastewater; organic pollutant

PL

modyfikowane popioły z węgla kamiennego; adsorpcja; popiół lotny; kinetyka adsorpcji; węgiel koksujący; oczyszczanie ścieków; zanieczyszczenia organiczne

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2012
• Tom: Vol. 38, nr 3
• Strony: 79--95
• Opis fizyczny: Bibliogr. 35 poz., tab., rys.

Twórcy

autor

Tang H.

• School of Biochemical Engineering, Anhui Polytechnic University, Anhui, 241000, China

autor

Liu G.-Z.

• Beijing Municipal Research Institute of Environmental Protection, Beijing, 100083, China

autor

Yan Y.-B.

• School of Biochemical Engineering, Anhui Polytechnic University, Anhui, 241000, China

autor

Gong J.-L.

• School of Biochemical Engineering, Anhui Polytechnic University, Anhui, 241000, China

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