Evaluation of Solar Photosensitised River Water Treatment in the Caribbean

Table 2

Inactivation rate constants (k, min⁻¹), for direct photolysis (solar radiation), and photosensitisers methylene blue and malachite green at varying concentrations of 0.5 to 3.0 mg/L.

Photochemical processes	Inactivation rate constants (k, min^−1)		Photochemical dosage (mg/L)
	Methylene blue	Malachite green
Direct photolysis	0.034	0.046	—
Photosenstiser	0.057	0.057	0.5
	0.068	0.064	1.0
	0.079	0.078	1.5
	0.051	0.068	2.0
	0.072	0.076	2.5
	0.088	0.086	3.0