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Table 2

Average metals concentrations in filtered and untreated samples and percentage removal efficiencies in automobile workshops 1 and 2

Metals (mg/L)Workshop 1
Workshop 2
GAC-RHTe(GAC-RH)%GR-GACTe(GR-GAC)%RH-onlyTe(RH-only)%UntreatedGAC-RHTe(GAC-RH)%GR-GACTe(GR-GAC)%RH-onlyTe(RH-only)%Untreated
Cadmium 0.01 52.38 0.01 56.56 0.02 14.55 0.021 0.017 23.10 0.018 21.32 0.021 6.30 0.022 
Copper 0.006 73.33 <MDL ≈100 <MDL ≈100 0.023 0.010 52.00 <MDL ≈100 <MDL ≈100 0.021 
Lead 0.086 92.67 0.18 84.54 0.050 95.78 1.17 0.19 77.34 0.43 49.28 0.14 83.82 0.85 
Iron 12.3 67.60 23.48 38.15 26.13 31.17 37.96 11.91 66.34 18.68 47.20 25.16 28.90 35.38 
Metals (mg/L)Workshop 1
Workshop 2
GAC-RHTe(GAC-RH)%GR-GACTe(GR-GAC)%RH-onlyTe(RH-only)%UntreatedGAC-RHTe(GAC-RH)%GR-GACTe(GR-GAC)%RH-onlyTe(RH-only)%Untreated
Cadmium 0.01 52.38 0.01 56.56 0.02 14.55 0.021 0.017 23.10 0.018 21.32 0.021 6.30 0.022 
Copper 0.006 73.33 <MDL ≈100 <MDL ≈100 0.023 0.010 52.00 <MDL ≈100 <MDL ≈100 0.021 
Lead 0.086 92.67 0.18 84.54 0.050 95.78 1.17 0.19 77.34 0.43 49.28 0.14 83.82 0.85 
Iron 12.3 67.60 23.48 38.15 26.13 31.17 37.96 11.91 66.34 18.68 47.20 25.16 28.90 35.38 

Note: <MDL = Less than method detection limit.

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