[ Effets de rejets industriels de l’usine de traitement d’eau de Kinshasa (REGIDESO) sur la qualité physico-chimique et biologique des eaux des rivières Matete et N’djili,
RD Congo ]
Volume 29, Issue 2, March 2017, Pages 96–109
Nadine Bipendu Muamba1, Vincent Lukanda Mwamba2, Dieudonné MUSIBONO EYUL ANKI3, Victor Pwema Kiamfu4, and Koto-te-Nyiwa Ngbolua5
1 Département de Chimie, Faculté des Sciences, Université de Kinshasa, B.P. 190 Kinshasa XI, RD Congo
2 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
3 Université de Kinshasa, Faculté des Sciences, Département de l'Environnement, Laboratoire d'Ecotoxicologie et microbiologie environnementale, B.P. 190 Kinshasa XI, RD Congo
4 Département de Biologie, Faculté des Sciences, Université de Kinshasa, B.P. 190, Kinshasa XI, RD Congo
5 Département de Biologie, Faculté des Sciences, Université de Kinshasa, BP 190 Kinshasa XI, RD Congo
Original language: French
Copyright © 2017 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.
The effluents from the water treatment station of REGIDESO located in Kingabwa (Kinshasa city) are accused of reducing aquatic biodiversity of Matete and N'djili rivers and are responsible of some human diseases. The effects of these effluents on the physico-chemical and biological quality of water of Matete and N’djili rivers were evaluated. The benthic macro-invertebrates and Gambusia affinis were used as biodiversity richness indicator and model system for toxicity assays. The analyses of physicochemical parameters revealed a constant temperature in the stations studied (± 25 °C) and a high value of conductivity in the sites near the effluents discharge location. On the whole of the sites, the bacterial load was reduced to the neighboring sites of the effluents discharge. The pH is slightly acidic depending on the period and the sampling sites. Dissolved oxygen decreases as sampling seasons. 1405 specimens of benthic macro-invertebrates including 499 in the rainy season and 906 in dry season were harvested. The Shannon index value ranges from 0.4 to 2.9 during rainy season and 1.7 to 2.9 during dry season, reflecting the passage of polluted water to moderately pollute in rain season and moderately polluted to slightly pollute in the dry season. The toxicity bioassay revealed that these effluents are toxic (LC50= 0.109%). It is thus desirable to install a monitoring system near of the station of water purification of the REGIDESO N’djili in order to regularly control the dangerosity of the effluents poured in the surrounding watery ecosystems.
Author Keywords: Water quality assessment, bio-indicators, Macro-invertebrates, Gambusia affinis, aquatic ecosystem, pollution.
Volume 29, Issue 2, March 2017, Pages 96–109
Nadine Bipendu Muamba1, Vincent Lukanda Mwamba2, Dieudonné MUSIBONO EYUL ANKI3, Victor Pwema Kiamfu4, and Koto-te-Nyiwa Ngbolua5
1 Département de Chimie, Faculté des Sciences, Université de Kinshasa, B.P. 190 Kinshasa XI, RD Congo
2 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
3 Université de Kinshasa, Faculté des Sciences, Département de l'Environnement, Laboratoire d'Ecotoxicologie et microbiologie environnementale, B.P. 190 Kinshasa XI, RD Congo
4 Département de Biologie, Faculté des Sciences, Université de Kinshasa, B.P. 190, Kinshasa XI, RD Congo
5 Département de Biologie, Faculté des Sciences, Université de Kinshasa, BP 190 Kinshasa XI, RD Congo
Original language: French
Copyright © 2017 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
The effluents from the water treatment station of REGIDESO located in Kingabwa (Kinshasa city) are accused of reducing aquatic biodiversity of Matete and N'djili rivers and are responsible of some human diseases. The effects of these effluents on the physico-chemical and biological quality of water of Matete and N’djili rivers were evaluated. The benthic macro-invertebrates and Gambusia affinis were used as biodiversity richness indicator and model system for toxicity assays. The analyses of physicochemical parameters revealed a constant temperature in the stations studied (± 25 °C) and a high value of conductivity in the sites near the effluents discharge location. On the whole of the sites, the bacterial load was reduced to the neighboring sites of the effluents discharge. The pH is slightly acidic depending on the period and the sampling sites. Dissolved oxygen decreases as sampling seasons. 1405 specimens of benthic macro-invertebrates including 499 in the rainy season and 906 in dry season were harvested. The Shannon index value ranges from 0.4 to 2.9 during rainy season and 1.7 to 2.9 during dry season, reflecting the passage of polluted water to moderately pollute in rain season and moderately polluted to slightly pollute in the dry season. The toxicity bioassay revealed that these effluents are toxic (LC50= 0.109%). It is thus desirable to install a monitoring system near of the station of water purification of the REGIDESO N’djili in order to regularly control the dangerosity of the effluents poured in the surrounding watery ecosystems.
Author Keywords: Water quality assessment, bio-indicators, Macro-invertebrates, Gambusia affinis, aquatic ecosystem, pollution.
Abstract: (french)
Les effluents provenant de la station d’épuration d’eau de la REGIDESO installée à Kingabwa (Kinshasa) sont accusés de réduire la biodiversité aquatique des rivières Matete et N’djili et d’occasionner certaines maladies chez l’homme. Les effets de ces rejets industriels sur la qualité physico-chimique et biologique des eaux des rivières Matete et N’djili ont été évalués. Les macro-invertébrés benthiques et Gambusia affinis ont été utilisés respectivement comme l’indicateur de la richesse en biodiversité et système modèle pour le test de toxicité. L’analyse des paramètres physicochimiques révèle que la température est constante (± 25 °C) aux différents points échantillonnée et une valeur élevée de la conductivité dans les sites proches du point de rejet. Sur l’ensemble des sites, la charge bactérienne était réduite aux sites proches du lieu de déversement des effluents. Le pH est légèrement acide et la teneur en O2 dissous décroît selon les saisons. 1405 macro-invertébrés benthiques appartenant à 4 classes ont été identifiés.499 en saison de pluie et 906 en saison sèche. L’indice de Shannon varie de 0,4 à 2,9 en saison de pluie et de 1,7 à 2,9 en saison sèche et indique que les eaux passent de polluées à moyennement polluées en saison des pluies et de moyennement polluées à faiblement polluées en saison sèche. Le bio-test au Gambusia affinis a révélé que la toxicité de ces effluents (LC50= 0.109%). Il est donc souhaitable d’installer un système monitoring à côte de la station d’épuration d’eau de la REGIDESO N’djili en vue de contrôler régulièrement la dangerosité des effluents déversés dans les écosystèmes aquatiques environnants.
Author Keywords: Evaluation de la qualité de l’eau, bio-indicateur, macro-invertébrés, Gambusia affinis, écosystème aquatique, pollution.
How to Cite this Article
Nadine Bipendu Muamba, Vincent Lukanda Mwamba, Dieudonné MUSIBONO EYUL ANKI, Victor Pwema Kiamfu, and Koto-te-Nyiwa Ngbolua, “Effects of industrial wastes from water treatment station of Kinshasa city (REGIDESO) on the physicochemical and biological quality of water of Matete and N’djili rivers (RD Congo),” International Journal of Innovation and Scientific Research, vol. 29, no. 2, pp. 96–109, March 2017.
