Table 3 BBD experimental range and level of independent variables.

From: Bio-chelate assisted leaching for enhanced heavy metal remediation in municipal solid waste compost

Process variables

Code

Level range

 − 1

 + 1

GLDA concentration (mM)

k1

130

170

pH

k2

2.5

3.5

Retention time (min)

k3

120

180

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