Abstract:
Samples of untreated and treated effluent were collected on hourly basis
forming a composite sample from Midland Galvanising Company
(MID GAL) and Industrial project International (IPI) respectively.
Grab samples were also collected from nearby streams where the
effluents were being discharged and also to the river in which the streams
flows into. All the samples were preserved appropriately and
physicochemical parameters and heavy metal concentrations of the samples
were carried out using standard method for water and effluents analysis
(Ademoroti, 1996).
The result of the physicochemical determinations for the samples had
the suspended solids (mg/l) ranged from 0.89 to 3.99, the total solids had its
value ranged from 2.00 to 28.06mg/l, dissolved solids had its values ranged
from 0.28 to 24.65mg/l, volatile solids had its values ranged from 0.01 to
10.99, the pH of the sample had its values from 3.35 to 10.99, the
conductivity of the sample extended from 120 to 13,100~s/cm, some of the
samples had no acidity detectable with its greatest values in the others as
2000mg/l, the alkalinity had its values ranged from 15.00 to 680mg/l, BOD
had its value from 0.45 to 1.40mg/1 in the samples while COD had its values
extended from 4.00 to 414.00ppm, the DO values in mg/l extended from
3.66 to 5.04 and the total phosphate values in the samples in mg/l were 0.74
± 0.006,0.25 ± 0.006, 1.53 ± 0.006, 1.00 ± 0.006 , 0.09 ± 0.006 ,0.26 ±
0.006, 1.26 ± 0.006 in Ogun river, treated effluent from IPI, untreated
effluent from IPI, sample from stream close to MIDGAL , treated effluent
from MID GAL , untreated effluent from MIGDAL company and sample
from stream close to IPI company respectively.
The heavy metal profile of the sample had no traces of cobalt, Nickel,
Arsenic and Cadmiun samples analysed.
Iron had its concentration in ppm extending from 0.42 to 11.72 ppm ,
Manganese was absent from Ogun river, treated effluent from MIDGAL
and blank sample, Zinc concentration had values from 0.63 to 198.70 ppm
no traces of copper in samples from Ogun river, stream close to MID GAL
company , Stream close to IPI company, treated effluent from MID GAL
company and the blank sample. Lead was absent in ogun river , treated
effluent from IPI stream close to MIDGAL, Stream close to IPI , Untreated
effluent from IPI and the blank sample. There were no traces of selenium in
river close to MIGDAL, Stream close to IPI and blank sample but selenuim,
had its presence in Ogun river, treated IPI effluent, untreated effluent from
MIDGAL, treated effluent from MID GAL untreated effluent from IPI .
