Fluid treatment system

A fluid treatment system comprising:

• an inlet;
• an outlet;
• and
• a fluid treatment zone disposed between the inlet and the outlet, the fluid treatment zone having disposed therein an array of rows of radiation source assemblies;
• each radiation source assembly having a longitudinal axis disposed at an oblique angle with respect to a direction of fluid flow through the fluid treatment zone;
• each row comprising a plurality of radiation source assemblies in spaced relation in a direction transverse to the direction of fluid flow through the fluid treatment zone to define a gap through which fluid may flow between an adjacent pair of radiation source assemblies;
• the array comprising pairs of serially disposed rows of radiation source assemblies, each pair comprising two rows of radiation source assemblies that are staggered with respect to one another in a direction orthogonal to the direction of fluid flow through the fluid treatment zone such that the gap between an adjacent pair of radiation source assemblies in an upstream row of radiation source assemblies is partially or completely obstructed in the direction of fluid flow by a serially disposed radiation source assembly in a downstream row of radiation source assemblies.

A gravity fed water treatment system comprising:

• an inlet;
• an outlet;
• a water treatment zone disposed in an open channel between the inlet and the outlet, the water treatment zone having disposed therein an array of rows of elongate ultraviolet radiation source assemblies;
• and
• a cleaning system configured to remove fouling materials from an exterior of the elongate ultraviolet radiation source assemblies;
• each elongate ultraviolet radiation source assembly having a longitudinal axis disposed at an oblique angle with respect to a direction of water flow through the water treatment zone and comprising an elongate ultraviolet radiation source disposed in a protective sleeve, the protective sleeve having a closed distal end disposed in the water treatment zone and a proximal end disposed exteriorly of the water treatment zone;
• each row comprising a plurality of elongate ultraviolet radiation source assemblies in spaced relation in a direction transverse to the direction of water flow through the water treatment zone to define a gap through which water may flow between an adjacent pair of elongate ultraviolet radiation source assemblies;
• the array comprising pairs of serially disposed rows of elongate ultraviolet radiation source assemblies, each pair comprising two rows of elongate ultraviolet radiation source assemblies that are staggered with respect to one another in a direction orthogonal to the direction of water flow through the water treatment zone such that:
• (i) the upstream rows in each pair of elongate ultraviolet radiation source assemblies in the array are in substantial alignment in a direction substantially parallel to the direction of water flow through the water treatment system, and (ii) the downstream rows in each pair of elongate ultraviolet radiation source assemblies in the array are in substantial alignment in a direction substantially parallel to the direction of water flow through the water treatment system.