Method for continuous filteration of fluids

A method for the continuous filtration of a liquid effluent, comprising the steps of:

• supplying the effluent to a top end of an enclosed, upstanding container, said container being divided into an inner cylindrical section and an outer-annular section by a permeable coaxial inner cylindrical wall;
• forming a continuously recirculating filter bed in the outer-annular section of the container, said filter bed comprised of particulate filter particles supplied to a top end of the outer-annular section, said filter particles allowed to fall through the outer-annular section to be then recirculated to the top end of the outer-annular section;
• positioning a microfilter means to extend about and to be supported by the permeable coaxial inner cylindrical wall, said microfilter means having a mesh width of ten to two hundred microns, wherein said microfilter means filters the effluent of floucculated impurity particles, and allows the effluent to pass through the permeable coaxial inner cylindrical wall and transversely to the outer-annular section with the recirculating filter bed formed thereat to be further filtered thereby;
• cleaning said microfilter by supplying a pressurized cleaning fluid to rotary nozzles supported at a top end of the inner cylindrical section, said rotary nozzles having lengths to extend along the height of the microfilter means such that the pressurized cleaning fluid is sprayed along the entire height of the microfilter means to thereby remove the in fluctuated impurity particles from the microfilter means as the rotary nozzles rotate to spray the entire area of the microfilter means, and
• withdrawing the liquid effluent, now filtered, from the annular container.

A method for a continuous filtration of a liquid effluent, comprising the steps of:

• supplying the effluent to a top end of an enclosed container, said container being divided into an inner cylindrical section and an outer-annular section by a permeable coaxial inner cylindrical wall;
• forming a continuously recirculating filter bed in the outer-annular section of the container, said filter bed comprised of particulate filter particles supplied to a top end of the outer-annular section, said filter particles allowed to fall through the outer-annular section, to be then resupplied to the top end of the outer-annular section;
• positioning a microfilter means to extend about and to be supported by the permeable coaxial inner cylindrical wall, said microfilter means having a mesh width of ten to two hundred microns, wherein said microfilter means filters the effluent of floculated impurity particles, and allows the effluent to pass through the permeable coaxial inner cylindrical wall and traversely to the outer-annular section with the recirculating filter bed formed thereat to be further filtered thereby;
• cleaning said microfilter means by spraying a pressurized cleaning fluid onto the microfilter means to remove the floculated impurity particles from the microfilter means;
• and
• withdrawing the liquid effluent, now filtered, from the container.