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Table 3

Values of kinetic constant, kinetic adjustment and kinetic order applied to the removal of colour (in MR, when COD/SO₄²⁻ = 0.67 and COD/SO₄²⁻ = 1.50) and sulphate (in ER and MR when COD/SO₄²⁻ = 1.50)

	COD/SO₄²⁻ = 0.67		COD/SO₄²⁻ = 1.50
	ER	MR	ER	MR
Sulphate	Not calculated due to low removal efficiencies		k₀ = 30.66 mg·L⁻¹·h⁻¹; R² = 0.9460 Zero order	k₀ = 29.17 mg·L⁻¹·h⁻¹; R² = 0.9648 Zero order
Colour	Not adjustable to ‘zero order’ kinetics	k₀ = 0.0031 mg·L⁻¹·h⁻¹; R² = 0.9706 Zero order	Not adjustable to ‘zero order’ kinetics	k₀ = 0.0034 mg·L⁻¹·h⁻¹; R² = 0.9685 Zero order

	COD/SO₄²⁻ = 0.67		COD/SO₄²⁻ = 1.50
	ER	MR	ER	MR
Sulphate	Not calculated due to low removal efficiencies		k₀ = 30.66 mg·L⁻¹·h⁻¹; R² = 0.9460 Zero order	k₀ = 29.17 mg·L⁻¹·h⁻¹; R² = 0.9648 Zero order
Colour	Not adjustable to ‘zero order’ kinetics	k₀ = 0.0031 mg·L⁻¹·h⁻¹; R² = 0.9706 Zero order	Not adjustable to ‘zero order’ kinetics	k₀ = 0.0034 mg·L⁻¹·h⁻¹; R² = 0.9685 Zero order