Please use this identifier to cite or link to this item: http://41.89.96.81:8080/xmlui/handle/123456789/3383
Title: Assessment of heavy metal and extent of acid pollution from lead storage battery manufacturing firms in Nairobi area
Authors: Kiarie, Peter Kiongo
Keywords: Assessment of heavy metal and extent of acid pollution from lead storage battery manufacturing firms in Nairobi area
Issue Date: Feb-1995
Publisher: Egerton University
Abstract: Effluent samples from four wet—acid battery manufacturing factories were collected over a period of eight months and analysed for acidity (pH) and heavy metals using atomic absorption and atomic (flame) emission techniques. The objective of this study was to assess the level of heavy metals in effluent discharged from these factories into public water courses and/or sewers. Sample pH ranged from 1.3 to 7.8 with a median of pH of 2.4. The majority of the effluent were found to be strongly acidic (pH < 4.6). Less than 25% of the samples had a pH within the range of 6.0-9.0 recommended by the pollution control section of Kenya's Ministry of Water Development. Lead concentrations in the effluent were all above the maximum limit of 0.1 and 1 ppm set for discharges into public water courses and public sewers, respectively. Levels ranged from 2.6 to 40.1 ppm with a median of 7.0 ppm. These values suggest that the polluting potential of these factories is high when compared with public health standard requirements for water. All the other metals investigated (Ca, Cu, Co, Mn, Fe, Cr, Zn, Cd, Na and K) were either below or slightly above the allowable limits except for Cu, Fe and Cr which were significantly higher than the recommended maximum discharge limits. The high metal concentrations in the effluent as well as the low pH were attributed to either insufficient treatment applied by the respective companies or factory activities other than
URI: http://41.89.96.81:8080/xmlui/handle/123456789/3383
Appears in Collections:Faculty of Science



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