Solid type

Initial pH

pH after adsorption

Control (CT)

5.04 (5.01, 5.33)

4.88 (4.75, 4.92)

Orange peel biochar (OB)

4.87 (4.73, 4.91)

5.32 (5.11, 5.64)

Chicken litter biochar (CB)

6.21 (6.03, 6.43)

5.11 (5.02, 5.36)

Tannery waste biochar (TB)

4.96 (4.75, 5.14)

4.84 (4.61, 4.98)

Orange peel biochar + algae (OB + AG)

6.24 (6.17, 6.58)

7.36 (7.27, 7.45)

Chicken litter biochar + algae (CB + AG)

6.35 (6.15, 6.64)

6.42 (6.21, 6.53)

Tannery waste biochar + algae (TB + AG)

7.24 (7.17, 7.35)

5.83 (5.52, 5.95)