[ Etude de la Bioaccumulation des composants minéraux dans les sols remblayés par les scories et boues des fonderies de recyclage de la mitraille, ferraille à Kinshasa (RDC) ]
Volume 33, Issue 4, September 2021, Pages 650–665
Joseph M. Kakundika1, Dieudonné E. Musibono2, Virima Mudogo3, and Ndongala Lufimpadio4
1 Université de Kinshasa, RD Congo
2 Professeur ordinaire & Directeur du groupe ERGS, Département de l'Environnement, Faculté des sciences, Université de Kinshasa (UNIKIN), RD Congo
3 Département de Chimie, Faculté des Sciences, Université de Kinshasa, RD Congo
4 Département de Chimie-physique, Faculté des Sciences, Université Pédagogique Nationale, RD Congo
Original language: French
Copyright © 2021 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Because of their multi-element chemical composition and especially because of the presence of trace metal elements (TME) at relatively high levels, sludge and slag from foundries are classified as hazardous waste. For this reason, they must undergo all the rigorous management imposed on such types of waste. However, those in charge of the Kinshasa scrap foundries remain deaf to this.Indeed, these scraps from the scrap metal foundries of Kinshasa are spread in plots, streets and avenues of the city of Kinshasa to be used as backfill without prior treatment to the detriment of a suffering population subject to serious environmental problems (potholes, erosion heads, floods, etc.).After chemical analysis of these wastes, it turns out that they contain Na2O, CaO, Cr2O3, MnO, Fe2O3, NiO, CuO, La2O3, Eu2O3, Yb2O3, OsO4, Br, SiO2, K2O, TiO2, V2O5, ZnO, Ti2O3, Au, Sc2O3, SrO, ZrO2, Nb2O5, RuO2, BaO, Re2O7, Al2O3, MgO, Rb2O, HgO [1], while the chemical analysis of the soils backfilled by these slags and sludges of the foundries reveals that they contain all these components except Na2O, Br, Ti2O3, Nb2O5, BaO and Rb2O. Also, some typical components such as AsO3, As2O4, PbO and P2O5 which were not measured in the slag and sludge of the smelters were measured in the soils backfilled by the said slag and sludge.Furthermore, the comparison of the chemical composition of the soils backfilled by SBFs with that of the soils not affected by the backfill shows that P2O5, Al2O3, MgO, OsO4, La2O3, Yb2O3 and SO3, components of the backfilled soils, were not measured in the non-filled soils (blank sample).From a semi-quantitative point of view, it has just been demonstrated that almost all components of the soils backfilled with slag and sludge from smelters have relatively higher concentrations than their counterparts in the unfilled soils, with the exception of SiO2, V2O5 and Sc2O3.
Author Keywords: Bioavailable, bioaccumulated, slag, sludge, smelters, fills, components.
Volume 33, Issue 4, September 2021, Pages 650–665
Joseph M. Kakundika1, Dieudonné E. Musibono2, Virima Mudogo3, and Ndongala Lufimpadio4
1 Université de Kinshasa, RD Congo
2 Professeur ordinaire & Directeur du groupe ERGS, Département de l'Environnement, Faculté des sciences, Université de Kinshasa (UNIKIN), RD Congo
3 Département de Chimie, Faculté des Sciences, Université de Kinshasa, RD Congo
4 Département de Chimie-physique, Faculté des Sciences, Université Pédagogique Nationale, RD Congo
Original language: French
Copyright © 2021 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Because of their multi-element chemical composition and especially because of the presence of trace metal elements (TME) at relatively high levels, sludge and slag from foundries are classified as hazardous waste. For this reason, they must undergo all the rigorous management imposed on such types of waste. However, those in charge of the Kinshasa scrap foundries remain deaf to this.Indeed, these scraps from the scrap metal foundries of Kinshasa are spread in plots, streets and avenues of the city of Kinshasa to be used as backfill without prior treatment to the detriment of a suffering population subject to serious environmental problems (potholes, erosion heads, floods, etc.).After chemical analysis of these wastes, it turns out that they contain Na2O, CaO, Cr2O3, MnO, Fe2O3, NiO, CuO, La2O3, Eu2O3, Yb2O3, OsO4, Br, SiO2, K2O, TiO2, V2O5, ZnO, Ti2O3, Au, Sc2O3, SrO, ZrO2, Nb2O5, RuO2, BaO, Re2O7, Al2O3, MgO, Rb2O, HgO [1], while the chemical analysis of the soils backfilled by these slags and sludges of the foundries reveals that they contain all these components except Na2O, Br, Ti2O3, Nb2O5, BaO and Rb2O. Also, some typical components such as AsO3, As2O4, PbO and P2O5 which were not measured in the slag and sludge of the smelters were measured in the soils backfilled by the said slag and sludge.Furthermore, the comparison of the chemical composition of the soils backfilled by SBFs with that of the soils not affected by the backfill shows that P2O5, Al2O3, MgO, OsO4, La2O3, Yb2O3 and SO3, components of the backfilled soils, were not measured in the non-filled soils (blank sample).From a semi-quantitative point of view, it has just been demonstrated that almost all components of the soils backfilled with slag and sludge from smelters have relatively higher concentrations than their counterparts in the unfilled soils, with the exception of SiO2, V2O5 and Sc2O3.
Author Keywords: Bioavailable, bioaccumulated, slag, sludge, smelters, fills, components.
Abstract: (french)
A cause de leurs compositions chimiques multiéléments et surtout à cause de la présence des éléments en traces métalliques (ETM) à des teneurs relativement élevées, les boues et scories des fonderies sont classées dans la catégorie de déchets dangereux. Pour ce, elles doivent subir toute la rigueur de gestion imposée à pareils types de déchets. Pourtant, les tenants des fonderies de la mitraille de Kinshasa demeurent sourds quant à ce.En effet, ces rebuts des fonderies de la mitraille kinoise sont épandus dans des parcelles, rues et avenues de la ville de Kinshasa pour servir comme remblais sans traitement préalable au détriment d’une population en souffrance soumise à des sérieux problèmes environnementaux (nids-de-poule, têtes d’érosion, inondations, etc.).Après analyse chimique de ces rebuts, il s’avère qu’ils contiennent le Na2O, CaO, Cr2O3, MnO, Fe2O3, NiO, CuO, La2O3, Eu2O3, Yb2O3, OsO4, Br, SiO2, K2O, TiO2, V2O5, ZnO, Ti2O3, Au, Sc2O3, SrO, ZrO2, Nb2O5, RuO2, BaO, Re2O7, Al2O3, MgO, Rb2O, HgO [1], tandis que l’analyse chimique des sols remblayés par ces scories et boues des fonderies révèle qu’ils renferment tous ces composants exceptés le Na2O, Br, Ti2O3, Nb2O5, BaO et Rb2O. Aussi, certains composants typiques tels que AsO3, As2O4, PbO et P2O5 qui n‘ont pas été dosés dans les scories et boues des fonderies l’ont été dans les sols remblayés par lesdites scories et boues.Par ailleurs, la comparaison de la composition chimique des sols remblayés par les SBF à celle des sols non touchés par les remblais atteste que P2O5, Al2O3, MgO, OsO4, La2O3, Yb2O3 et SO3, composants des sols remblayés n’ont pas été dosés dans les sols non remblayés (échantillon blanc).Sur le plan semi quantitatif, il vient d’être démontré que la quasi majorité de composants des sols remblayés par les scories et boues des fonderies ont des concentrations relativement élevées que leurs homologues des sols non remblayés, à l’exception des SiO2, V2O5 et Sc2O3.
Author Keywords: Biodisponibles, bioaccumulés, scories, boues, fonderies, remblais, composants.
How to Cite this Article
Joseph M. Kakundika, Dieudonné E. Musibono, Virima Mudogo, and Ndongala Lufimpadio, “Study of the Bioaccumulation of mineral components in soils backfilled with slag and sludge from scrap metal, scrap recycling foundries in Kinshasa (DRC),” International Journal of Innovation and Applied Studies, vol. 33, no. 4, pp. 650–665, September 2021.
