Septic Discharge UV Systems

Many Councils are now withholding building consents unless Septic discharge water contains an E.coli count lower than 200.

While 'Advanced Secondary Treatment Systems' remove the solids (to a count of 20/30 or lower for BOD & TSS), they do not lower the E.coli count (which can be in the millions).

As suspended solids in the water shield some of the E.coli, for effective UV reduction, it is necessary that the treatment / disc filtration reduces BOD/TSS to less than a count of 10. At this level pleated paper cartridge filtration prior to the UV Chamber can prevent the quartz sleeve from constant fouling. The sleeve should be checked regularly to determine its cleaning cycle.

Our System is designed so that when the septic tank 'high level float switch' is triggered, power is turned on to the UV system. After a 2 minute delay (for the UV lamp to heat up) power is then supplied to the evacuation/irrigation pump. When the 'low level switch' is triggered, power is cut.