(NL9401669-A)      Waste air or -water is cleaned to remove organic waste material. In the case of air, a container (2) is partially filled with carrier elements (3) forming a packed bed through which waste air can flow from an air feed (4) in the bottom of the container. Purified air exits through an outlet (9) in the top of the container. A water sprinkling device (6) sprays water which passes gradually downwards through the carrier elements and through a support grid (13) to the bottom of the container, from which it can be returned by a pump (8). In the case of water, air is passed from the bottom through the carrier elements.    USE -   Efficient processing by development of micro-organism in bed. Development of sludge is efficiently prevented.    (JP10509635-W)      Waste air or -water is cleaned to remove organic waste material. In the case of air, a container (2) is partially filled with carrier elements (3) forming a packed bed through which waste air can flow from an air feed (4) in the bottom of the container. Purified air exits through an outlet (9) in the top of the container. A water sprinkling device (6) sprays water which passes gradually downwards through the carrier elements and through a support grid (13) to the bottom of the container, from which it can be returned by a pump (8). In the case of water, air is passed from the bottom through the carrier elements.    USE -   Efficient processing by development of micro-organism in bed. Development of sludge is efficiently prevented.    (US5895567-A)      Waste air or -water is cleaned to remove organic waste material. In the case of air, a container (2) is partially filled with carrier elements (3) forming a packed bed through which waste air can flow from an air feed (4) in the bottom of the container. Purified air exits through an outlet (9) in the top of the container. A water sprinkling device (6) sprays water which passes gradually downwards through the carrier elements and through a support grid (13) to the bottom of the container, from which it can be returned by a pump (8). In the case of water, air is passed from the bottom through the carrier elements.    USE -   Efficient processing by development of micro-organism in bed. Development of sludge is efficiently prevented.    (EP785911-B1)      Waste air or -water is cleaned to remove organic waste material. In the case of air, a container (2) is partially filled with carrier elements (3) forming a packed bed through which waste air can flow from an air feed (4) in the bottom of the container. Purified air exits through an outlet (9) in the top of the container. A water sprinkling device (6) sprays water which passes gradually downwards through the carrier elements and through a support grid (13) to the bottom of the container, from which it can be returned by a pump (8). In the case of water, air is passed from the bottom through the carrier elements.    USE -   Efficient processing by development of micro-organism in bed. Development of sludge is efficiently prevented.