| dc.description.abstract | The water quality in Namanve catchment along the Kampala Industrial Business Park is steadily
deteriorating due to increased contaminants from runoff and discharge from the industrial
developments. Coupled with urban growth and population increase, industrial expansion threatens
the quality of surface and underground water sources. This study was conducted to understand water
quality changes in the Namanve sub-catchment due to increased industrialization in the Kampala
Industrial Business Park. A field reconnaissance visit was conducted at Namanve to identify the
potential pollution sources in the Industrial Park. Sampling of industrial wastewater discharge,
sediments and natural water streams from the three segments in the study area (upstream, industrial
section and downstream) was conducted. Physiochemical and heavy metal analysis was done at
Entebbe's Ministry of Water Laboratory. The extent of pollution in the KIBP was determined by
comparing the concentration of heavy metals with the NEMA and WHO standards. The enrichment
factor was used to determine the effect of chemical pollution from industrial development on the
receiving natural stream in the Namanve micro-catchment. The study showed that industrial waste
water discharge points had highest levels of cobalt (0.0112±0.00027ppm), Lead (0.08627±0.000713
ppm) and Manganese (1.6502±0.014 ppm) at Uganda batteries Ltd and they were all higher than the
NEMA and WHO standards. For sediments, steel industries (Roofings and Steel and Tube)
registered significantly higher levels of heavy metals (Cd=0.9279±0.0094, Pb=177.7±3.45,
Co=14.15±0.242 ppm) than other industries (p<0.05). Roofings registered high levels of
Mn=459.3±4.82 ppm and Plaskon paints registered higher levels of Cr (283.8±3.8) and Ni
(40.67±0.617 ppm), all these values were higher than NEMA and WHO standards. The study also
showed that the concentration of heavy metals, was significantly higher downstream of the industrial
development compared to the levels upstream (p<0.05). Levels of Pb, Co, Cr and Ni in Namanve
downstream were 123.19±2.212 ppm, 14.2±0.329 ppm, 135.28±2.884 ppm and 26.03±0.663ppm
respectively. While levels of Pb, Co, Cr and Ni in the upstream were 24.997±2.212, 7.32±0.329,
64.23±2.884 and 22.64±0.663ppm respectively higher than the NEMA standards. This study also
showed higher concentrations of Cd (1.448±0.026 ppm), Cr (135.278±2.884 ppm), Pb
(123.186±2.213 ppm), Co (14.217±0.329 ppm), Ni (26.025±0.663), and Mn (861.721±22.161 ppm)
in downstream than the upstream, however the concentration of As (0.0067±0.0002) and Hg
(0.00067±0.0002 ppm) were higher in the upstream than the downstream and the NEMA and WHO
standards. Therefore, continuous monitoring of wastewater discharges from the Industries by NEMA is recommended. The Industry Operators should improve the efficiency of waste treatment
Practices to reduce the pollution in the receiving natural water streams in Namanve micro catchment. | en_US |
