Environmental Engineering Reference
In-Depth Information
at 122 mg/g, while S-NZVI showed 25.8 mg/g. The high sorption of IONP may be due to
precipitation at the surface. A high but comparatively low uptake was observed for GNP
and AgNP, indicating 3.65 and 5.44 mg/g, respectively, for Pb(II) treatment. The tested
S-NZVI and IONP indicated 24.97 and 18.11 mg/g, respectively, for Zn(II) adsorption. In
addition, no considerable Zn(II) sorption was observed for GNP and AgNP. On the basis of
the results, a monolayer formation can be suggested for the metal adsorption for S-NZVI,
while for Pb on IONP it may be a multilayer formation. Therefore, S-NZVI can be consid-
ered as a potential material for metal treatment and nutrient removal in landill leachates.
37.4 Conclusions
In this study, we synthesized and characterized four different nanoparticles: S-NZVI,
IONP, GNP, and AgNP. Thereafter, these materials were applied to landill leachate from
the Gohagoda open dump site in Sri Lanka, with the synthetic leachate targeting the
effect on nutrients and metals removal. Characterization results conirmed the formation
of expected nanoparticles, and batch experiments demonstrated that some of these mate-
rials could be used for application in landill leachate treatments. In summary, synthe-
sized S-NZVI showed the highest removal densities for nitrate-N (1.65 × 10
−5
mol/m
2
)
and
phosphate (1.95 × 10
−7
mol/m
2
). Furthermore, results from adsorption studies indicated the
effective removal of Pb(II) and Zn(II) for S-NZVI and IONP, >90% within the irst 60 min.
Therefore, it can be concluded that the starch-coated NZVI can be effectively used to treat
tropical landill leachates. However, it is important to investigate the cost-beneit differ-
ences of using S-NZVI for such treatment, especially for developing nations. Also, further
studies may be vital in enhancing the nutrient and metal treatment of other nanoparticles,
IONP, GNP, and AgNP, by application of different coatings or activating them using dif-
ferent methods.
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