Abstract: Provided is an ordered step-wise method for the chlorination and photodestruction of MC-LR contamination of an aqueous liquid such as a potable water supply infested with blue-green algae (cyanobacteria). It has been found possible to usefully chlorinate the water at lower chlorine:MC-LR ratios as compared to known methods and then to irradiate the water with ultraviolet radiation to photolyze the chlorinated MC-LR. The methods incorporate the prechlorination of a cyanotoxin, more advantageously a microcystin, and most advantageously MC-LR, to enhance UV-induced photodegradation of this compound.

Abstract: Provided is an ordered step-wise method for the chlorination and photodestruction of MC-LR contamination of an aqueous liquid such as a potable water supply infested with blue-green algae (cyanobacteria). It has been found possible to usefully chlorinate the water at lower chlorine:MC-LR ratios as compared to known methods and then to irradiate the water with ultraviolet radiation to photolyze the chlorinated MC-LR. The methods incorporate the prechlorination of a cyanotoxin, more advantageously a microcystin, and most advantageously MC-LR, to enhance UV-induced photodegradation of this compound.

Abstract: The invention provides an immersible and portable module for irradiating fluids including a multiplicity of ultraviolet radiation producing lamp and a first header for receiving and maintaining in position the multiplicity of ultraviolet radiation-producing lamps, the first header having upstream and downstream ends and opposed sides. There is also a second header for receiving and maintaining in position the multiplicity of ultraviolet radiation-producing lamps, the second header having upstream and downstream ends and opposed sides. Fluid flow diverters are positioned between the first and second headers and located adjacent the opposed sides and are adapted to divert fluids flowing adjacent the opposed sides toward at least some of the ultraviolet radiation-producing lamps.