International Journal of Research in Environmental Studies
ISSN: 2059-1977
Vol. 8(4), pp. 48-54, December 2021

Physico-chemical characteristics and heavy metals in wastewater from paint industries in Yenagoa Metropolis, Bayelsa State, Nigeria

Bekeowei R. A.1* and Bariweni P. A.2

1Department of Geography and Environmental Management, Faculty of Social Sciences, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria.
2Department of Marine Environment and Pollution Control, Nigeria Maritime University, Okerenkoko, Delta State, Nigeria.

*To whom correspondence should be addressed. E-mail:

Received 18 October, 2021; Received in revised form 20 November, 2021; Accepted 25 November, 2021.


Water pollution, Atomic absorption spectrophotometer, Parameter, Effluent, Heavy Metals, Yenagoa Metropolis.

This study investigated the physico-chemical parameters and heavy metals concentrations in wastewater samples from different paint industries in Yenagoa metropolis. Wastewater samples were collected from six different paint industry locations thrice monthly during morning and evening shift hours for six months. The samples were analyzed by standard methods for pH, DO, BOD, COD, NO3, PO4, Turbidity, Fe, As, Cr, Cu, Cd, Mn, Pb, Co, and Zn. The result of the laboratory analysis of the wastewater samples indicated that the mean values of pH ranged from 2.438 to 6.303, DO ranged from 3.364 to 5.541 mg/l, BOD from 3.842 to 4.298 mg/l, COD from 2.888 to 5.675 mg/l, NO3 from 9.815 to 67.845 mg/l, PO4 from 2.710 to 4.813 mg/l, Turbidity from 86.813 to 547.301 NTU, Fe 3.337 to 17.991 mg/l, Pb from 0.036 to 0.098 mg/l, Zn 0.478 to 3.302 mg/l, Cu.0345 to 1.343 mg/l, Co 0.253 to 0.447 mg/l, As 1.195 to 5.022 mg/l, Mn from 0.037 to 1.769 mg/l, Cd 0.002 to 0.528 mg/l and Cr from 0.141 to 0.733 mg/l. Results showed that the mean values of COD, BOD, NO3, PO4, Turbidity, Fe, As, Cr, Cu, Cd, Mn, Pb, Co in the wastewater samples were above the NIS and WHO permissible limits. The study also indicated that there was significant variation in the concentration of heavy metals in the wastewater samples from different locations. This may be due to raw materials of different chemical composition used at different test times. The implications of the high concentration of heavy metals in the wastewater discharged into the environment have been highlighted.

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