Sample

Parameters (mg/l)

TKN

BOD

COD

Greywater

87 ± 3

1175 ± 25

1908 ± 108

Sand

39.7 ± 0.95

11 ± 1

741.5 ± 28.5

Sand + biochar

25.8 ± 2.4

12.5 ± 2.5

691.5 ± 151.5

Sand + charcoal

23.4 ± 1.8

9 ± 1

617 ± 50

Sand + organoclay

7.8 ± 0.6

8.5 ± 1.5

699.5 ± 66.5

Sand + sawdust

10.4 ± 2

47.5 ± 2.5

714.5 ± 151.5