Physico-Chemical and Bacteriological Analysis of Waste water from Hospital "Case of Centre University Teaching Hospital of Kigali"

Abstract— Hospitals produce relatively huge amount of wastewater containing pathogenic microorganisms, toxic, laboratory and pharmaceuticals residuals, disinfectants, biodegradable, polluters and radioactive contaminants that are potentially threats to population health and the components of environment when they are discharged without proper treatment.

The purpose of the study was the assessment of water quality effluent from CHUK wastewater treatment plant (CHUK WWTP) by analyzing physico-chemical and bacteriological parameters.  Sampling has been take place at different points and time better understanding of how hospital unit operations affect the effluent quality. A sum of twelve (12) samples were collected in three (3) trials at four (4) different points in Nyarugenge, Gitega and at the border with Kimisagara sector especially Mpazi stream where CHUKWWTP’s effluents are discharged. Samples collection, conservation, preparation and measurement took place at university of Rwanda-college of science and technology (CST) laboratory.

The obtained results at WWTP outlet, at point of meeting with Mpazi stream, Mpazi stream and mixture of Mpazi stream with CHUK effluent were Cu (0.06, 0.07, 0.05 and 0.07mg/l); Fe (0.13, 0.037, 0.037 and 0.034mg/l); Pb (0.021, 0.024, 0.024, and 0.027mg/l); Hg (0.0015, 0.003, 0.003 and 0.004 mg/l) respectively. pH (7.25, 812,7.74 and 7.4); COD (215.5, 122.4, ,145.5 and 187.2mg/l); BOD5 (29.3, 30.85, 29.4 and 27.3 mg/l); TN (3.29, 2.97,3.2 and 3.46 mg/l); TP (1.05, 0.91, 0.92 and1.05mg/l); NH₄⁺(7.46, 8.5,7.5and 8.8 mg/l); TSS (77, 56.5,62.8 and 69.1mg/l); fecal (282, 263,270, and 273 CFU/ml) and TC (233, 213, 224 and 210 CFU/ml). These parameters are prescribed within the reference limits of Rwanda Standard Board (RSB) and World Health Organization (WHO) standards, thus they have no negative side impact and effects on the receiving environments and their components.