Bayer Aktiengesellschaft

Thomas Melin

Otto Horak

Klaus Holzer

Otto Barth

Felix Wolff

Hubert Stracke

Process for the treatment of organic pollutants in wastewaters by wet

Oxidative cleaning process of contaminated slurries or slurried earth

In a process for the biological elimination of halogen- and sulfur-containing gaseous pollutants from a waste air stream, the waste air stream is passed through an intermittently moistened trickling filter tower. In a preferred variant of the process, individual sections of the surface of the trickling filter are subjected to intermittent phase-displaced moistening. Cyclic moistening of the trickling filter sections can be achieved in this way. The volume-time yield in the biological purification of gas streams can be considerably improved by this process.

Process for the biological purification of waste air streams

The outgoing gas or waste water is conveyed through a gas-liquid contact apparatus in which biological purification takes place. A bubble plate-type column (2) is used as gas-liquid contact apparatus. The biomass is distributed over the plates (3) in the form of an aqueous suspension with a layer height corresponding to a liquid content per plate greater than 0.07 m.sup.3 /m.sup.2, preferably greater than 0.15 m.sup.3 /m.sup.2 of column cross-section. During the biological purification of gas, the gas to be purified is supplied at the lower end of the bubble plate-type column (2). It then flows through the plates (3) and issues again as purified gas at the top of the plate column (2). When the plate column is used for purifying waste water, the waste water to be purified is conveyed from top to bottom through the plate column (2) and is traversed by air, oxygen or oxygen-containing gas. At the same time, a proportion of the biomass is separated from the purified waste water and re-circulated into the entering waste water or into the column. The waste water to be purified flows successively over the plates (3) to the liquid outlet (11). From here, the clarified waste water flows out through the overflow (13). This process is suitable, in particular, for highly charged waste water, particularly if a compact structure is required during construction of the apparatus.

Bubble plate system for biological purification of air and waste water

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Koln, Germany

Thomas Melin