Treatment of oily streams contaminated with lipophilic pollutants by peroxide oxidation using catalysts developed from compost derived from municipal solid waste
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Nowadays, waste management through mechanical biological treatment (MTB) consists
on the use of the separated organic fraction of municipal solid waste (MSW) to feed
anaerobic digestion processes, resulting therein a solid stream, further processed to
compost, which can be used in agriculture. Currently, the production of compost is
higher when compared to its demand and expected developments on coming directives
under “End-of-waste” criteria are leading to barriers on the use of fertilizers resulting
from waste [1]. Within this context, the current work proposes an alternative strategy to
the valorisation of compost, through the production of low-cost materials to be used in
catalytic processes. Thus, several materials were prepared from compost obtained from
a MTB plant for MSW. The compost was first mixed and washed with water, in order to
homogenise and remove soluble compounds and suspend solids. Then, two different
materials were prepared by carbonization at 400 (C-400) and 800 ºC (C-800). In addition,
following the procedure previously described [2], two materials were prepared with
H2SO4 before and after the carbonization at 800 ºC (C-S-800 and C-800-S, respectively).
The materials were assessed in H2O2 decomposition and peroxide oxidation of three
model pollutants with different lipophilic character, Sudan-IV (S-IV), 2-nitrophenol
(2-NP) and 4nitrophenol (4-NP) in cyclohexane and water in order to simulate oily
wastewater (Fig.1). The materials show catalytic activity in both H2O2 decomposition
and peroxidation of the pollutants when compared to the non-catalytic runs. The most
significant difference was found when C-800-S was used, since low conversions of H2O2
and 4-NP was achieved. However, the acidification of the sample resulted favourable in
the oxidation of S-IV, leading to the highest conversion of this pollutant.
