Fluid treatment system

A fluid treatment system comprising:

• an inlet;
• an outlet;
• a fluid treatment zone disposed between the inlet and the outlet, the fluid treatment zone having disposed therein an array of radiation source assemblies, each radiation source assembly having a longitudinal axis transverse to a direction of fluid flow through the fluid treatment zone;
• the array of radiation source assemblies comprising:
• a first row of radiation source assemblies, a second row of radiation source assemblies downstream from the first row of radiation source assemblies, a third row of radiation source assemblies downstream from the second row of radiation source assemblies and a fourth row of radiation source assemblies downstream from the third row of radiation source assemblies;
• an adjacent pair of radiation source assemblies in the first row defining a first gap through which fluid may flow, a radiation source assembly from the second row partially obstructing the first gap to divide the first gap into a second gap and a third gap, a radiation source assembly from the third row at least partially obstructing the second gap and a radiation source assembly from the fourth row at least partially obstructing the third gap.

A fluid treatment system comprising:

• an inlet;
• an outlet;
• a fluid treatment zone disposed between the inlet and the outlet, the fluid treatment zone having disposed therein an array comprising 4 rows radiation source assemblies arranged serially from an upstream portion to a downstream portion of the fluid treatment zone;
• each radiation source assembly having a longitudinal axis transverse to a direction of fluid flow through the fluid treatment zone;
• wherein:
• (i) a first pair of rows of radiation source assemblies in the array comprise substantially uniform spacing between adjacent pairs of radiation source assemblies in the row;
• and (ii) a second pair of rows of radiation source assemblies in the array comprise substantially non-uniform spacing between adjacent pairs of radiation source assemblies in the row.