Abstract: A waste treatment system including at least one treatment chamber through which a fluid to be treated is moved in a fluid flow, the or each treatment chamber including at least one of a number of ultraviolet light sources, and at least one dispersion assembly located at a base of the treatment chamber to disperse at least one sterilizing agent supplied to the treatment chamber in a counter flow direction to the fluid flow.

Abstract: Water purification or treatment apparatus (410) including a plurality of elongated water treatment chambers (433), each chamber (433) being normally oriented in a substantially vertical attitude, return pipes (434) interconnecting the chambers (433) whereby water to be treated flows in series through the respective chambers (433), gas outlets (443) for supplying gas such as ozone to the respective chambers (433) for bubbling upwardly through water flowing in the chambers (433) and creating a foam at the upper surface of water in the chamber (433) and means (440) for collecting the foam.

Abstract: A modular water treatment unit including a modular tank having a plurality of joined tank parts defining respective chambers arranged in series for treating water, each tank part having opposite side walls with adjacent side walls of adjacent said tank parts being joined at their common upper ends which define weirs over which water being treated in the unit may flow from one tank part to the adjacent tank part for treatment in the respective chambers. The modular water treatment unit may be associated with a floatable support for floating in or on a body of water for treating water therein.

Abstract: A drum filter assembly comprising a hollow drum filter having a longitudinal axis and an outer filter screen or mesh material, the drum filter being supported on external rollers for rotation about its longitudinal axis and an inlet for introducing liquid to be filtered into the interior of the drum filter. Rotation of the drum filter is effected by the liquid flowing into the drum filter. Alternatively, the drum filter may be driven by an external motor.

Abstract: A self-contained aquaculture system comprising a modular building defining a first main chamber for containing fish or marine invertebrates, a second swirl chamber comprising a primary filter communicating with the main chamber for removing solids from the main chamber, a drum filter for receiving and filtering water from the swirl chamber, a third biological filter chamber beneath the drum filter for receiving water therefrom and a biological filter tank. Water is pumped from the chamber. The building defines an enclosed space over the chambers, the temperature of which is controlled by an air conditioning unit. A foam fractionator, ultraviolet unit and ozone generator are used for treating the water in the main chamber.

Abstract: A self-contained aquaculture system comprising a modular building defining a first main chamber for containing fish or marine invertebrates, a second swirl chamber comprising a primary filter communicating with the main chamber for removing solids from the main chamber, a drum filter for receiving and filtering water from the swirl chamber, a third biological filter chamber beneath the drum filter for receiving water therefrom and a biological filter tank. Water is pumped from the chamber. The building defines an enclosed space over the chambers, the temperature of which is controlled by an air conditioning unit. A foam fractionator, ultraviolet unit and ozone generator are used for treating the water in the main chamber.