During the filtration cycle of the Power Clean Filter System, the inlet feed fluid passes through valve "A" and enters the top of the vessel. The fluid is forced through the media where the solids and oil are removed.
The clean filtered fluid exits through valve "E". The vent valve "F" remains open during filtration to continuously remove any gas and oil from the top of the vessel. The filtration step terminates in one of three (3) ways:
- Time lapses (24 hours maximum).
- Differential pressure (14 psig) or
Any of these methods will start the media cleanup cycle.
B. Media Clean Up
The first step closes the "E" and "F" valve. After 10 seconds valve "A" closes and valve "B" opens and the top pump is turned on. The fluid in the vessel passes through the fluidization pump, the scrubber assembly and back into the vessel through the fluidization nozzle. The fluid is jetted though the nozzle and into the media bed, creating a homogenous mixture of water, solids, hydrocarbons and media. This mixture is then circulated through the fluidization pump causing a shearing action that strips the oil and contaminants from the media. The entire bed fluidizes in a few seconds.
Once the bed is fluidized, valve "C" opens, allowing the dirty water to pass through the scrubber screen and into the discharge line. This water is replaced with inlet water through valve "B" and up through the bottom screen. The combination of inlet water and internal agitation cleans the bottom screen. The water-media mixture continues to pass through the fluidization pump, down the outside of the scrubber screen and returns to the vessel. Dirty water passes through the screen in the discharge line and through valve "C".
This process lasts for the amount of time (normally 10 minutes) set on the PLC located in the control box. After the contamination level in the vessel has been reduced by approximately seventy-five percent (75%), the discharge is complete and valve "C" closes. Ten (10) seconds later the pump is turned off. This final step cleans the separator system.
The next step in regeneration is a delay cycle, which allows the media particles to settle. The fluidization pump is turned off, allowing the media to sink by gravity. This takes approximately one (1) minute. Thirty (30) seconds into the delay time, valve "A" will open, valve "B" will close and the fluidization pump will come on for four (4) seconds to clear the media from the scrubber assembly. During the last thirty (30) seconds the media will settle by gravity for the completion of this cycle.
The last step in the media fluidization cycle is purging the lines and setting the bed. It is necessary to compress the bed to its filtering configuration and to remove the dirty fluid and heavy contaminants that remain in the bottom of the vessel. Valve "D" opens allowing the influent to be cleaned while passing though the media bed and forcing all contaminants out into the discharge waste tank.
5. Filtration - 2nd Cycle
5. Filtration - 2nd Cycle
After regeneration has been completed the unit is ready to return to the filtration cycle. This is done by opening valves "E" and "F" and closing valve "D".