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Table 1 Model parameters

From: Improving household water treatment: using zeolite to remove lead, fluoride and arsenic following optimized turbidity reduction in slow sand filtration

Model

TI

Parameter

60 NTU

80 NTU

100 NTU

120 NTU

Exponential

TF = a × exp (b × s)

a

113 × 10-1

128 × 10-1

137 × 10-1

150 × 10-1

b

-1.7 × 10-3

-1.8 × 10-3

-1.8 × 10-3

-1.9 × 10-3

Logarithmic

TF = c × Ln(s) + d

c

-3.8

-4.3

-4.5

- 4.9

d

28.2

32

33.5

36.3

Linear

TF = e × s + f

e

-0.01

-0.01

-0.01

-0.01

f

9.1

10.2

10.8

11.7

Power

TF = g × s h

g

672

876

962

1156

h

-0.82

-0.85

-0.86

-0.87

  1. TF denotes final turbidity (NTU) and s is the sand depth (mm)