Thermal Degradation Of Organic Pollutants In
Sewage Sludge
Author(s)
R. Font, M. F. Gomez-Rico & A. Fullana
Abstract
Sewage sludge from a domestic water treatment plant was heated in an air
atmosphere at different temperatures (105-500 ºC) for 1 hour in order to study
the degradation of some organic pollutants. The compounds studied were: linear
alkylbenzene sulphonates (LAS) with an alkylic chain of 10-13 atoms of carbon,
and nonylphenolic compounds, including nonylphenol (NP) and nonylphenol
ethoxylates with 1 and 2 ethoxy groups (NP1EO+NP2EO). These compounds
were studied because they frequently exceed the limits proposed for sludge
application to land in Europe. The lowest temperature did not show variations
with respect to the initial sludge, but at 250 ºC the concentrations of LAS and NP
were reduced by around 30% and NP1EO+NP2EO disappeared. Logically, at
500 ºC all compounds studied were totally removed. The study was completed
with a thermogravimetric analysis of LAS, NP and NP1EO+NP2EO separately
carried out at different times of treatment and different temperatures. The results
showed that an increase of the treatment time at moderate temperatures
(<250 ºC) reduced the concentrations of NP and NP1EO+NP2EO, which can be
interesting since probably the beneficial properties of the sludge for the soil are
practically not changed.
Keywords: linear alkylbenzene sulphonates, nonylphenolic compounds, thermal
degradation, sewage sludge.
1 Introduction
Land application is one of the alternatives for the use of the great quantities of
sewage sludge generated by WWTPs. When the sludge is applied to soils, their
physical properties are improved and they receive nutrients such as nitrogen and
phosphorous. However, this may cause the accumulation of potentially
Keywords
linear alkylbenzene sulphonates, nonylphenolic compounds, thermal
degradation, sewage sludge.
Related Book
Other papers in this volume
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