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Table 5

Contaminant removal efficiency of three filtration setup at different HLRs

Removal efficiencyOutlet 1 – Terracotta
Outlet 2 – Gravel
Outlet 3 – Cinder
ParameterHLR − 4 cm/m2HLR − 40 cm/m2HLR − 4 cm/m2HLR − 40 cm/m2HLR − 40 cm/m2HLR − 40 cm/m2
% Removal% Removal% Removal% Removal% Removal% Removal
BOD5 (mg/L) 90 76 86 68 54 59 
COD (mg/L) 73 41 70 27 62 35 
Ammonia – N (mg/L) 45 28 53 39 28 27 
Log10FC (MPN/100 mL) removal* 1.2 1.6 1.5 1.8 1.5 
Removal efficiencyOutlet 1 – Terracotta
Outlet 2 – Gravel
Outlet 3 – Cinder
ParameterHLR − 4 cm/m2HLR − 40 cm/m2HLR − 4 cm/m2HLR − 40 cm/m2HLR − 40 cm/m2HLR − 40 cm/m2
% Removal% Removal% Removal% Removal% Removal% Removal
BOD5 (mg/L) 90 76 86 68 54 59 
COD (mg/L) 73 41 70 27 62 35 
Ammonia – N (mg/L) 45 28 53 39 28 27 
Log10FC (MPN/100 mL) removal* 1.2 1.6 1.5 1.8 1.5 
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