Assessment of Heavy Metal Concentrations (Cu, Cd, Pb, and Zn) in Wastewater from Gusii Treatment Plant in Kisii County, Kenya

The concentrations of heavy metals were determined from wastewater samples collected the Gusii treatment plant, May to July, 2021. Heavy metal analysis was done using a flame atomic absorption spectrophotometer, model AA 7000 Shimadzu, Japan. results showed that Zinc and Cadmium below detection limit for all sampling sites. Lead Copper (Mean ± SE) ranged between 0.34 0.06 mg/L 0.86 0.08 0.25 0.05 0.01 respectively. month July exhibited higher mean Cu concentration 0.35 0.004 compared (0.2 0.02 mg/L) May. Likewise, lead (0.60 0.04 than (0.53 mg/L.) July. independent sample t-test difference significant months (t (34) = 21.58; p < 0.05) while Pb it not (30) 1.241; 0.274). percentage removals generally low at 12.61 % 6.27 %, continued discharge effluent into River Riana may accumulation in environment, which turn poses health risks general public. Therefore, study recommends Water Sanitation Company continue monitoring assessing levels plant its sustainability.