Apparatus for filtration

Claim 1

An apparatus for filtration, which comprises in combination 1 a filtration column consisting of 1 a vertical cylinder, 2 an inner cylindrical compartment disposed inside said vertical cylinder, erected so that the axis thereof falls in a vertical direction, provided in its side wall with a multiplicity of perforations for passage of liquid and possessed of an opening at the lower end 3 an outer jacket compartment disposed so as to have said inner cylindrical compartment concentrically surrounded thereby, provided in the zone of its side wall corresponding to the perforated zone of said inner cylindrical compartment with a multiplicity of perforations for passage of liquid, constructed so that a part of the said vertical cylinder constitutes the outer wall thereof and possessed of an opening at the lower end, 4 a filter bed having a granular filtering material constituting a filter bed packed in the space intervening between said inner cylindrical compartment and the outer jacket compartment and 5 a means for delivering a liquid subjected to filtration and a means for discharging the filtered liquid, which means are connected to said inner cylindrical compartment and the outer jacket compartment so that the liquid will be passed in radial directions, either outwardly or inwardly, from one of said two compartments to the other, 2 a washing column consisting of, 1 a storage barrel having a large inner volume and provided with a means for projecting the washing water; and 2a washing head connected to and located above the upper portion of said storage barrel and provided therein with (a) a cylindrical outer wall whose upper end is closed; (b) an outer cylinder coaxially disposed inside said outer wall and connected to said outer wall at its bottom for thereby forming an annular empty portion closed at its bottom; (c) an inner cylinder coaxially disposed inside said outer cylinder and possessed of a greater height than said outer cylinder and open at both ends thereof; (d) a pipe for delivery of the liquid subjected to washing so disposed that the discharge end thereof opens at a level higher than the upper end of said outer cylinder; and (e) an outlet disposed at the lower portion of said outer wall for discharging the spent washing water overflowing said outer cylinder, 3 flow paths connecting the upper end and the lower end of said filtration column respectively to said washing column so as to permit conveyance of the granular filtering material between the columns and 4 a means adapted to cause the individual granules constituting said filter bed within said filtration column to be driven, while under simultaneous agitation, through the flow path into said washing column to be washed therein and convey the washed granules back to said filtration column in which they are packed to form a new filter bed.

Claim 2

An apparatus for filtration, which comprises in combination 1 a filtration column consisting of 1 a vertical cylinder, 2 an inner cylindrical compartment disposed inside said vertical cylinder, erected so that the axis thereof falls in a vertical direction, provided in its side wall with a multiplicity of perforations for passage of liquid and possessed of an opening at the lower end 3 an outer jacket compartment disposed so as to have said inner cylindrical compartment concentrically surrounded thereby, provided in the zone of its side wall corresponding to the perforated zone of said inner cylindrical compartment with a multiplicity of perforations for passage of liquid, constructed so that a part of the said vertical cylinder constitutes the outer wall thereof and possessed of an opening at the lower end, 4 a filter bed having a granular filtering material constituting a filter bed packed in the space intervening between said inner cylindrical compartment and the outer jacket compartment and 5 a means for delivering a liquid subjected to filtration and a means for discharging the filtered liquid, which means are connected to said inner cylindrical compartment and the outer jacket compartment so that the liquid will be passed in radial directions, either outwardly or inwardly, from one of said two compartments to the other, 2 a washing column consisting of, 1 a storage barrel having a large inner volume and provided with a means for projecting the washing water; and 2a washing head connected to and located above the upper portion of said storage barrel and provided therein with (a) a cylindrical outer wall whose upper end is closed; (b) an outer cylinder coaxially disposed inside said outer wall and connected to said outer wall at its bottom for thereby forming an annular empty portion closed at its bottom; (c) an inner cylinder coaxially disposed inside said outer cylinder and possessed of a greater height than said outer cylinder and open at both ends thereof; (d) a pipe for delivery of the liquid subjected to washing so disposed that the discharge end thereof opens at a level higher than the upper end of said outer cylinder; and (e) an outlet disposed at the lower portion of said outer wall for discharging the spent washing water overflowing said outer cylinder, 3 flow paths connecting the upper end and the lower end of said filtration column respectively to said washing column so as to permit conveyance of the granular filtering material between the columns and 4 a means adapted to cause the individual granules constituting said filter bed within said filtration column to be driven, while under simultaneous agitation, through the flow path into said washing column to be washed therein and convey the washed granules back to said filtration column in which they are packed to form a new filter bed.