This paper is a report on epibenthic algae identified in water samples recovered from Kahuzi-Biega National Park streams. The samples were collected during dry season (July-August 2007) from 10 streams. Altogether, some 170 species with 9,872 individuals have been identified, belonging to 6 algal groups containing 61 genera. Bacillariophyceae with 3,550 individuals (61 species, 20 genera) formed the most abundant group followed by Cyanophyceae with 2,551 individuals (47 species, 12 genera) and Chlorophyceae with 1,685 individuals (30 species, 15 genera). This algal community is very diversified and balanced (Shannon-Weiner index varied between 4.44-4.67, Species Diversity between 15.81-13.31 and Equitability between 0.97-0.99). The higher number of species (114 species, 55 genera) was recorded at station MV and the lesser number (91 species, 51 genera) at station MG.

The goal of our study is to characterize the effluent of the municipal slaughter-houseof the Bukavu city and to recommend a suitable treatment, thus reducing the harmful effect which undergoes the receiving environment (Ruzizi River) and to also mitigate the loss of this hydrous resource in recoverable matter. The physicochemical characterization of raw wastewaterrevealed that this liquid rejection is very charged of organic matter expressed in termsof COD (Avg.= 219.52 mg/L), in BDO5(Avg.= 181.34 mg/L), in Suspend Matter (Avg.= 482 mg/L) and mineral matter expressed in terms of Chlorides (Avg.= 237 mg/L), Electric Conductivity (Avg.= 1360.5 μs/cm) and Alkalinity expressed in CaCO3(Avg.= 201 mg/KL) with a pH of 7.5. The average content of Nitrates isabout 1.74 mg/L. Although this wastewater presents a high organic load (BDO5/COD report = 0.83 and SM/BDO5= 2.66), it has a satisfactory bio deterioration. The COD/BDO5 report examination = 1.21 underlines well the biodegradable character of mixed wastewater of the Bukavu city municipal slaughterhouse to which, a biological treatment appears completely suitable.