Table 1 Composition of the sludge before and after calcination (unit: wt%).

From: A facile calcination conversion of groundwater treatment sludge (GTS) as magnetic adsorbent for oxytetracycline adsorption

Elements

Fe

Si

Mn

Ca

Mg

Al

Raw sludge

23.2

3.7

0.7

0.4

0.06

7.5

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