A CarboClean is applied for the removal of COD before water is discharged to surface water.
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The system is based on a tank filled with activated carbon and a high pressure pump with saturation pipe for air injection.
The pump pressurises the feed to the CarboClean, and air is dissolved into it.
While organic substances are adsorbed by the activated carbon, the dissolved oxygen will be used by bacteria in the filter to break down the organic material.
Since the organics will be stored in the activated carbon, the retention time will be long, giving the biomass the
opportunity to degrade it.
In the saturation pipe compressed air is injected and water and air are mixed. This air-water mixture then enters the carbon filter tank at the top and flows through the granular activated carbon layer.
Within the filter micro organisms are growing firmly attached to the filling media, this is why the filter feed pump runs continuously to provide oxygen for the bacteria.
The working of the CarboClean is based on two principles:
Part of the COD which is not removed from the biological treatment is removed by the CarboClean.
Backwash of the filter is done automatically, at regular intervals and in case differential pressure is too high.
Continuously measures COD and suspended solids in the pretreated water.
Ensures maximum killing power at the lowest possible power consumption while maximizing the operation life of the UV lamps.
Removes most of the remaining small suspended solids in the effluent, to make the water more suited for re-use in irrigation, truck wash, etc.