Method and basin for sedimentation of sludge in waste water
AssigneeOdense Vandselskab A/S
InventorJohn E. Pedersen
Life of this patent
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Abstract
A method and a basin serve the purpose of sedimenting sludge in waste water, which in a flow is supplied to the basin via an inlet and in clarified condition is removed via an outlet placed opposite to the inlet. In the inlet there has been built in resistances of flow which create a heavy turbulence in the water flowing and transform a substantial part of the energy of flow from the water into energy in the whirls which create the turbulence. Thereby there are created flow conditions which increase the creation of sludge flocs and the succeeding sedimentation of these.
Claims19
A method of removing sludge from waste water by flocculation, comprising the steps of:
- a) forcing a flow of sludge containing waste water to abruptly change direction a number of times in succession to form whirls that create an optimum velocity for formation of sludge flocs;
- b) directing the waste water flow into a basin at a decreased flow rate which is sufficient to form whirls and to form sludge flocs along a circular flow path in the basin to facilitate sedimentation of the sludge flocs for collection and removal at a lower portion of the basin and movement of sludge depleted water away from the sludge flocs toward an upper portion of the basin for removal;
- c) removing the sludge flocs from the lower portion of the basin;
- and
- d) removing the sludge-depleted water from the upper portion of the basin.
A sedimentation tank for removing sludge from waste water by flocculation, which comprises:
- a) an inlet containing a plurality of baffles for forcing a flow of sludge containing waste water to abruptly change direction a number of times in succession to form whirls that create an optimum velocity for formation of sludge flocs;
- b) a basin for receiving waste water flow from the inlet at a decreased flow rate which is sufficient to form whirls and to form sludge flocs along a circular flow path in the basin to facilitate sedimentation of the sludge flocs for collection and removal at a lower portion of the basin and movement of sludge depleted water away from the sludge flocs toward an upper portion of the basin for removal;
- c) an outlet in the upper portion of the basin for removing sludge-depleted water;
- and
- d) a sludge pit in the lower portion of the basin for removing sludge flocs.
Dependencies are inferred from the claim text.