An assessment of toxic metal biosorption by activated sludge from the treatment of coal-gasification effluent of a petrochemical plant

A standardized EDTA treatment was used to chelate sludge-bound metal-ions from activated sludge from the coal-gasification effluent of a petrochemical plant. The sludge was then equilibrated with solutions increasing to 100 mg l −1 Ni 2+, Cu 2+, Fe 2+, Zn 2+ and Cr 3+ individually and in combination...

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Veröffentlicht in:Water research (Oxford) 1989, Vol.23 (7), p.795-800
Hauptverfasser: Kasan, Hamanth C., Baecker, Albin A.W.
Format: Artikel
Sprache:eng
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Zusammenfassung:A standardized EDTA treatment was used to chelate sludge-bound metal-ions from activated sludge from the coal-gasification effluent of a petrochemical plant. The sludge was then equilibrated with solutions increasing to 100 mg l −1 Ni 2+, Cu 2+, Fe 2+, Zn 2+ and Cr 3+ individually and in combination. Metal biosorption by sludge was quantified and adsorption was analysed at 25 and 37°C using Nelson's interpretation of the Langmuir Model. Adsorption of Ni 2+, Cr 3+, Cu 2+ and Fe 2+ increased independently of temperature when applied as single solutions, whereas Cr 3+ and Fe 2+ adsorption diminished at 37°C when applied as mixtures of all metals. Affinity series constructed from Nelson equilibrium constants derived from adsorption isotherms showed that Ni was removed with greatest efficiency from single solutions but with less efficiency from mixtures suggesting that Ni site-specificity may occur.
ISSN:0043-1354
1879-2448
DOI:10.1016/0043-1354(89)90001-8