Process and apparatus for purification of wastewater

A process for the biological treatment and purification of wastewater in successive stages in the same basin comprising aerating the wastewater in one region of the basin, subjecting the wastewater to intermediate clarification in another region of the basin, removing sludge from the intermediate clarification region, aerating the wastewater after intermediate clarification a second time in a further region of the same basin, and carrying out a sedimentation stage in still another region of the same basin, wherein the volumes of the various regions of the basin are variable and are adjusted to the inlet load and to the purification process by appropriate positioning of movable walls separating the regions.

Apparatus for the purification of wastewater comprising a basin having a plurality of regions, including the following regions arranged in the following sequence in the direction of current flow:

• an activated sludge region, an intermediate clarification region having a sedimentation surface and having a sludge-removal device for removing sludge from the sedimentation surface, a post-clarification aeration region, and a post-clarification sedimentation region, and a plurality of walls dividing the basin into the plurality of regions and provided with passages to convey the wastewater from one region to another region, the passage from the activated sludge region to the intermediate clarification region being in a lower portion of the wall therebetween.

Apparatus for the purification of wastewater comprising a basin having a plurality of regions, including the following regions arranged in the following sequence in the direction of current flow:

• an activated sludge region, an intermediate clarification region, a post-clarification aeration region, and a post-clarification sedimentation region, and a plurality of walls dividing the basin into the plurality of regions and provided with passages to convey the wastewater from one region to another region, wherein the walls are movably mounted in the basin to permit changes in the volumes of the various regions.

A process for the biological treatment and purification of wastewater in successive stages in a plurality of regions in the same basin comprising aerating the wastewater in one region of the basin, subjecting the wastewater to clarification in another region of the basin, and removing sludge from the clarification region, wherein the volumes of the various regions of the basin are variable and are adjusted to the inlet load and to the purification process by appropriate positioning of movable walls separating the regions.

Apparatus for the purification of wastewater comprising a basin having a plurality of regions, including the following regions arranged in the following sequence in the direction of current flow:

• an activated sludge region and a clarification region, and a plurality of walls dividing the basin into the plurality of regions and provided with passages to convey the wastewater from one region to another region, wherein the walls are movably mounted in the basin to permit changes in the volumes of the various regions.