Decontamination of a natural multicomponent aqueous liquid waste by titania photocatalysis

Amjad S. Qazaq, Tedi Hudaya, Ivy A.L. Lee, Andrew Sulidis and Adesoji A. Adesina

International Journal of Environmental Technology and Management, 2008, vol. 9, issue 1, 97-104

Abstract: The aerobic photocatalytic degradation of municipal dump-site leachate at 300 K has been carried out in a pilot-scale bubble column reactor. The leachate feed is a complex mixture of various organics and nitrogenous compounds. Runs were performed over a 48-hour period at atmospheric pressure. Compositional analysis of aliquots from the reactor revealed simultaneous total organic carbon removal and conversion of uric compounds to ammoniacal species as evidenced by time-on-stream pH increase. A Langmuir-Hinshelwood kinetic model with a unimolecular rate-determining step and a strong adsorption constant (41.6 M⁻¹) adequately described the TOC reduction rate while NH₄⁺ ions production rate attained a maximum around a TOC concentration of 35mM suggesting competitive adsorption between the precursors for the two parallel reactions. Reaction rates exhibited linear dependency on light intensity up to 10⁻⁴ Einstein s⁻¹ and thereafter levelled off.

Keywords: titania photocatalysis; leachate; slurry bubble column reactor; municipal solid waste; aqueous liquid waste; waste decontamination; aerobic degradation; kinetic modelling; total organic carbon; TOC removal. (search for similar items in EconPapers)
Date: 2008
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