Method for removing odor from fluid
Process for removal of emission gas pollutants by biological means
Method for biological treatment of waste gases Patent #: 4662900
ApplicationNo. 07/022678 filed on 03/06/1987
US Classes:95/205, And separation of solid from contact liquid210/151, With separator210/615, Utilizing contact surfaces supporting microorganism (e.g., trickling filter, etc.)435/262, PROCESS OF UTILIZING AN ENZYME OR MICRO-ORGANISM TO DESTROY HAZARDOUS OR TOXIC WASTE, LIBERATE, SEPARATE, OR PURIFY A PREEXISTING COMPOUND OR COMPOSITION THEREFORE; CLEANING OBJECTS OR TEXTILES435/266, Treating gas, emulsion, or foam96/266With heat exchange means
ExaminersPrimary: Hart, Charles N.
Attorney, Agent or Firm
International ClassesC02F 3/02 (20060101)
B01D 53/84 (20060101)
B05B 15/12 (20060101)
Foreign Application Priority Data1986-03-12 DE
AbstractA method and an apparatus for the purification of waste air containing biologically decomposing impurities. The waste water is conducted through an absorption tower in which the impurities are absorbed by washing liquid containing an activated sludge. Subsequently, the impurities are biologically decomposed in an activated sludge basin by the microorganisms of the activated sludge. To ensure that the residual amount of washing liquid to be removed is small and only a small amount of biological excess sludge is produced even if large amounts of impurities must be decomposed, while the activated sludge basin remains relatively small, the waste air is subjected to a preliminary purification in at least two successive stages by means of a highly polluted washing liquid. Subsequently, the waste air is subjected to an after purification by means of an only lightly polluted washing liquid. The two different washing liquids are then conducted in a cascade-like manner through separate activated sludge basins. Only the washing liquid from the least polluted activated sludge basin is removed and subsequently purified.