Population growth and increasing needs make our current societies a considerable
source of environmental threats. Going towards sustainable cities where harmony
exists between economic, socio-cultural and environmental issues is a necessity
that is essential if we want to bequeath a livable world to future generations.
Cities produce huge quantities of domestic and industrial waste, the management
of which is becoming a growing problem for city managers. Located on the banks
of the Niger River, the city of Niamey, capital of the Republic of Niger, is
supplied with drinking water from this river. Significant quantities of sludge
are produced by the plant following the treatment of this water. This study
focuses on the physico-chemical characterization of this sludge which is now
directly discharged into the Niger River. A total of 12 samples of pasty sludge
taken from the pre-settling ponds were
analyzed. The samples were previously dried, crushed, sieved and packaged.
Physical (pH, EC and particle size), chemical (Ca, Mg, Na, K, CEC, AE, P, C, MO
and N) and metallic trace elements (Pb, Ni, Cu, Zn, Cd, Mn) parameters and Al)
were analyzed in the laboratory. The results show that the sludge is weakly
acidic (pH between 4.16 and 5.71), conductive (<0.35 mS/cm) and rich in fine
elements (12.1% to 77.71% clay). The nutrient content is low in
nitrogen (<0.25%), phosphorus (<2.5 ppm), potassium (between 1 to 188
Mèq/100g) and organic matter (less than 2.88%). The concentrations of ETM
comply with the values admissible in residual materials (French
decree of 08/01/1998). This sludge can be recovered, especially in agriculture.
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