Patent ID: 8580098

Claim:
A method of electrostatic filtering particles from a fluid comprising: providing a first filter tank containing a first concentrically wound filter media having channels between adjacent surfaces thereof, the first concentrically wound filter media being two concentrically wound filter media separated from each other by an annular passageway; the first filter tank having one or more conductive interconnect pins extending through the annular passageway and contacting the two concentrically wound filter media within the first filter tank; providing a second filter tank containing a second concentrically wound filter media having channels between adjacent surfaces thereof, the second concentrically wound filter media being another two concentrically wound filter media separated from each other by another annular passageway; the second filter tank having other one or more conductive interconnect pins extending through the another annular passageway and contacting the another two concentrically wound filter media within the second filter tank; applying a positive electrical charge to the first filter tank that positively charges the first concentrically wound filter media; applying a negative electrical charge to the second filter tank that negatively charges the second concentrically wound filter media; flowing fluid through the positively charged first and negatively charged second concentrically wound filter mediae, the fluid flowing in a direction parallel to and between charged surfaces of the filter mediae channels whereby contact friction within the channels generates triboelectric charges that accumulate on the positively charged first and negatively charged second concentrically wound filter mediae, the triboelectric charges also charging particles within the fluid flow; removing negatively charged particles from the fluid flow via the positively charged concentrically wound filter media in the first filter tank and positively charged particles from the fluid flow via the negatively charged concentrically wound filter media in the second filter tank while controlling accumulated positive and negative charges within the first and second filter tanks; and outputting an unbiased fluid flow from said first and second filter tanks.