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US4038028: Sewage sludge-irradiation device

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Filing Information

Inventor(s) La Roche; Ulrich ·
Assignee(s) BBC Brown Boveri & Company Limited ·
Attorney/Agent(s) Werner W. Kleeman ·
Primary Examiner Theodore A. Granger ·
Application Number US5632103
Filing date 11/14/1975
Issue date 07/26/1977
Predicted expiration date 11/14/1995
U.S. Classifications 422/186  · 250/492.1  · 210/400  · 250/433  · 210/386  · 378/66  · 976/DIG.379  · 976/DIG.442  ·
International Classifications A61L 300  ·
Kind CodeA
International Classifications 21064;386;400;401;243 ·
Foreign Priority CH1541874 - 11/20/1974 ·
16 Claims, No Drawings


Abstract

A sewage sludge-irradiation device for irradiating sewage sludge with radiation having a sterilizing effect. A conveyor system embodies at least two conveyor devices, at least one of which conveyor device is supplied with a layer of sewage sludge. The conveyor devices are arranged in a manner to form therebetween a passageway defining a mixing gap for the through-passing sewage sludge. A relative movement exists between the two conveyor devices, and radiation means cooperates with the conveyor system for irradiating the sewage sludge at a location prior to intermixing thereof in the mixing gap. The conveyor devices can be driven to possess respectively different speeds of movement, and it is also possible for one of the conveyor devices to be driven and the other to be stationary so as to define a stationary boundary means or surface for the mixing gap.

Independent Claims | See all claims (16)

  1. 1. An apparatus for irradiating sewage sludge with radiation having a sterilizing effect, comprising:a conveyor system incorporating means for providing at least two cooperating conveyor devices,means for supplying and depositing sewage sludge onto at least one of said conveyor devices,said means for supplying and depositing sewage sludge onto at least one of said conveyor devices comprises a sewage sludge container for supplying the sewage sludge, said at least one conveyor device being structured to cooperate with said sludge container so as to withdraw the sewage sludge therefrom, and spreader means for spreading the withdrawn sludge deposited onto said at least one conveyor device over at least part of a surface thereof, said spreader means forming a substantially coherent thin layer of sewage sludge upon the surface of said at least one conveyor device, said spreader means comprising a material spreading element,said conveyor devices being positioned relative to one another so as to form therebetween a passageway for the throughflow of the deposited sewage sludge, said passageway defining a mixing gap for the intermixing of the sewage sludge contained therein,means for establishing a relative movement between said two conveyor devices,said means for establishing a relative movement between said two conveyor devices comprises at least one drive means for driving at least one of said conveyor devices,radiation means positioned relative to said conveyor system for irradiating the sewage sludge at a location immediately prior to intermixing thereof in the mixing gap.
  2. 9. An apparatus for irradiating sewage sludge with radiation having a sterilizing effect, comprising:a conveyor system incorporating means for providing at least two cooperating conveyor devices,means for supplying and depositing sewage sludge onto at least one of said conveyor devices,said means for supplying and depositing sewage sludge onto at least one of said conveyor devices comprises a sewage sludge container for supplying the sewage sludge, and spray nozzle means for spraying sewage sludge from the sewage sludge container onto said at least one conveyor device, said spray nozzle means including a spray nozzle and pump means for pumping sewage sludge from the sewage sludge container through the spray nozzle onto said at least one conveyor device,said conveyor devices being positioned relative to one another so as to form therebetween a passageway for the throughflow of the deposited sewage sludge, said passageway defining a mixing gap for the intermixing of the sewage sludge contained therein,means for establishing a relative movement between said two conveyor devices,said means for establishing a relative movement between said two conveyor devices comprises at least one drive means for driving at least one of said conveyor devices,radiation means positioned relative to said conveyor system for irradiating the sewage sludge at a location immediately prior to intermixing thereof in the mixing gap.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US1052818 Henri et al. Feb 1913
US2132705 Smith Oct 1938
US3104197 CROWN ZELLERBACH CORP Back et al. Sep 1963
US3659096 CONTROLEX CORP AMERICA Kompanek Apr 1972
US3834985 WAERTSILAE OY AB Gullbey Sep 1974
US3854875 SULZER AG Bosshardt Dec 1974
US3914173 Call et al. Oct 1975
US3915865 KURITA WATER IND LTD Haji et al. Oct 1975