Removal Of Organic Compounds From
Waste Streams: A Combined Approach
Author(s)
J. O’Brien, T. Curtin & T. F. O’Dwyer
Abstract
A combination of factors, including costs associated with wastewater treatment
and more restrictive and stringent controls on industrial effluent pollution have
increased interest in water usage reduction, recycling and re-use opportunities.
In this study a novel two-step approach to treatment of low concentrations of
organic compounds in waste streams was investigated. Zeolite ZSM-5 was
investigated with a view to examining its potential to function as both adsorbent
and catalyst in the removal of aniline from aqueous solutions. The H-ZSM-5
zeolite was first loaded with copper before the aniline adsorption step. The
aqueous stability of the exchanged copper on the zeolite was assessed as a
function of solution pH. Minimum copper leaching was observed in the range
pH 5 to pH 11 thus providing a stable working pH range for the 1.4Cu-ZSM-5 to
function as an adsorbent material. Aniline adsorption was then carried out and an
uptake level of 40 mg g-1 aniline on the 1.4Cu-ZSM-5 zeolite was achieved. The
adsorption process followed the Langmuir model and aniline uptake was largely
uninfluenced by temperature. The kinetics of the adsorption process indicated
that maximum uptake of aniline occurred within thirty minutes. In the second
step of the process, the aniline loaded Cu-ZSM-5 adsorbent samples were
subjected to a catalytic oxidation process and mass spectroscopic analysis of the
catalytic reactor exhaust gases suggested clear oxidation of the aniline to carbon
dioxide, water and nitrogen, with minor amounts of nitrogen oxide gases being
produced.
Keywords: organics, ZSM-5, adsorption, catalytic oxidation, waste stream
treatment.
Keywords
organics, ZSM-5, adsorption, catalytic oxidation, waste stream
treatment.
Related Book
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