Table 2 Experimental conditions corresponding to the different modes of the advanced removal method for heavy metal removal from paper sludge ash.

From: Heavy metal removal using an advanced removal method to obtain recyclable paper incineration ash

Method

Agents

Mixing ratioa

Concentration (M)

Mixing time (h)

MS modeb

EDTA, OA

1:5, 1:5

0.1, 0.25

3.0

S1 modec

Step 1: EDTA

1:5

0.1

1.5

 

Step 2: OA

1:5

0.25

1.5

S2 moded

Step 1: OA

1:5

0.25

1.5

 

Step 2: EDTA

1:5

0.1

1.5

  1. aMixing ratio of paper sludge ash and solution.
  2. bUse of EDTA and OA simultaneously.
  3. cFirst step: EDTA; second step: OA.
  4. dFirst step: OA; second step: EDTA.
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