Effect of Hospital Effluents on Physicochemical Characterization on Mbandaka River Water: A case study of River Botema Bofala Nkele of DRC

Abstract

The present study consists with the physicochemical characterization of the effluents of the general hospital of reference of
Mbandaka in the receiving medium which is the river Botema Bofala Nkele. It arises from the analyses carried out that water of
the aforementioned river is polluted not only by the effluents of the hospital, but also from other not identified sources and that
goes beyond the standard, especially upstream of the outlet of the hospital.
The analysis was carried out of parameters hereafter: temperature, pH, electric conductivity, dissolved oxygen, chemical request
oxygenates some (DCO), biological request oxygenate some during 5 days (DBO5), Nitrate, suspended matter (MES) and
sulphate.
The pollution of this river is confirmed by the high percentages of nitrate of about 40,66 mg/L what proves a nitric pollution of
studied water.
Strong organic load results in the DBO5 and the high DCO respectively reaching 48,30 mg/L and 81,40 mg/L.In addition, the sulphate gave a value of 871,30 mg/L, which explains the value of the conductivity which reaches 169 µs/cm and the pH is 6,9.
The degree of contamination of this river located in which through the town of Mbandaka, differs from a site with another and
according to the distance from distance of the source of pollution