US3406830A

US3406830A - Decanting columns

Info

Publication number: US3406830A
Application number: US549390A
Authority: US
Inventors: Greensmith Norman
Original assignee: Naylor Bros Clayware Ltd
Current assignee: Naylor Bros Clayware Ltd
Priority date: 1966-05-11
Filing date: 1966-05-11
Publication date: 1968-10-22
Anticipated expiration: 1985-10-22

Description

Oct. 22, 1968 N, GREENSMITH 3,406,830

DECANTING COLUMNS Filed May 1l, 1966 2 Sheets-Sheet l Oct. 22, 1968 N. GREENSMITH DECANTING COLUMNS 2 Sheets-Sheet 2 Filed May 1l, 1966 United States Patent O 3,406,830 DECANTING COLUMNS Norman Greensmith, Horsforth, Leeds, England, assignor to Naylor Bros. (Clayware) Limited, Yorkshire, England, a British company Filed May 11, 1966, Ser. No. 549,390 4 Claims. (Cl. ZIO-241) ABSTRACT OF THE DISCLOSURE A decanting column for a sludge draining and drying `bed comprising a base mem-ber carrying a frame, said base member having a liquor outlet therein, an openended tube slidably and sealingly received into the base member, said tube having a series of restrictions around its inlet, and being supported on the frame by a screw threaded rod so as to enable movement of the tube relative to the base member.

This invention relates to a decanting column for supernatant liquids and is particularly concerned with such a column for use with beds for draining and drying sludge.

According to this inven-tion there is provided a decanting column for a sludge draining and drying -bed comprising a base member, a liquor outlet in said base member, an open-ended tube slidably and sealingly received into the base member, a frame carried by the base member, a restriction device around the free open end of the tube to limit the passage of solid material into the tube, and means carried by the frame above the tube for supporting the tube on the trame and for enabling the height between the liquor outlet and the liquor inlet defined by the free open end of the tube to be controllably varied by moving the tube relative to the base member.

Preferably, the restriction device comprises a series of pegs secured to the tube around the free open end thereof, said pegs extending away from the end of the tube and substantially parallel to the axis thereof.

An embodimentI of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a side view of a decanting column showing in chain-dot lines the level at which decanting is no longer necessary.

FIG. 2 is a half-sectional side View of the column shown in FIGURE 1.

A sludge liquid decanting column comprises `a base member in the form of a vitriiied clay sludge bed tile 1 having side outlet openings 1a, with a socket 2 within which a corrosion resistan-t anchor plate 3 is securely bonded with a filler 4 (FIGURE 2). In the inner surface of an integral annular plate 5 is mounted on an annular seal 6 which contacts a central decanting tube 7 and enables the tube to slide within the seal 6 whilst preventing passage of solid material therepast. Secured to the annular plate 5 are column frame members 8 which support, in a support column bridge 9, a screw-threaded nut 10 through which a screw-threaded rod 11, carrying an operating handle 12 in the form of `a cross bar, passes. The lower end of the rod 11 is secured to a top bar 13 extending across the open top end of the decanting tube 7. Around the top of the tube 7 are located weir pegs 14, between which a supernatant liquor 16 may pass into the decanting tube. The materials of the decanting column which come into contact with the liquor 16 to be decanted are corrosion resistant.

CII

3,406,830 Patented Oct. 22, 1968 In operation the decanting column is located in a sludge draining and drying bed 15 and the top .bar 13 of the decanting tube is controlled by rotation of the -bolt 11 to` position the bar 13 just below the surface of the liquor 16 above the sludge so that the liquor 16 drains between the weir pegs 14, into the decanting column, to pass through the socket 2 to waste whilst the sludge remains.

The weir pegs 14 serve to prevent passage of excessively large solids, though being suticiently far apart to be a negligible obstruction to the How of liquor and vfor it to be easy to clear away any solids from above.

The `amount of liquor 16 in the bed may be decreased by rotating rod 11 in a clockwise direction, thus moving the decanting tube 12 vertically downwards (see FIGURE l). Liquor at a lower level will then be decanted into the tube 7 `and drained to waste.

The lower level of the tube 7 yand weir pegs 14 as shown in FIGURE 1 is the level at which no further decanting is necessary, since at this point cracking of the sludge occurs.

An extension bar may be attached to the top of rod 11 to raise the operating handle 12 to the level required.

lt will be appreciated that according to the invention there is provided a simple and convenient decanting column by which the draining level of the 'bed may be innitely vari-able and that it is possible that the column may be positioned away from the walls.

What is claimed is:

1. A decanting column for a sludge draining and drying bed, comprising a base member, a liquor outlet in said base member, an open-ended tube slid'ably and sealingly received into the base member, a frame carried by the base member, restriction means around the free open end of the tube to limit the passage of solid materials into the tube, and means carried by the frame above the tube for supporting the tu-be on the frame and for enabling the height between the liquor outlet and the liquor inlet delined by the free open end of the tube to be controllably varied by moving the tube relative to the base member.

2. A decanting column as claimed in claim 1, wherein the restriction means comprises a series of pegs secured to' the tube around the free open end thereof, said pegs extending away from the end of the tube and being substantially parallel to the axis thereof.

3. A decan-ting column as claimed in claim 1, wherein the means for supporting the tube and for enabling move- -ment of the tube relative to the base member includes a screw-threaded rod secured to and rotatable in part of the frame, said rod supporting said tube.

4. A decanting column -as claimed in claim 3, wherein a screw-threaded nu-t is provided on the frame, said nut co-operating with the screw threaded rod.

References Cited UNITED STATES PATENTS 299,821 6/1884 McElroy 210-359 X 812,931 2/1906 Kiefer 210--241 X 1,252,573 l/19l8 Holt 210--166 1,386,340 8/1921 Wuster 210-359 1,450,545 4/1923 Hans 210-359 X 1,960,686 5/1934 Tumim 210-83 2,283,365 5/1942 Heinkel 210--166` 2,961,098 11/1960 Nash 210--241 REUBEN FRIEDMAN, Primary Examiner.

I. ADEE, Assistant Examiner.