METHOD FOR MICROBIOLOGICAL TRANSFORMATION OF SULPHUR - CONTAINING NOXIOUS SUBSTANCES INTO EXHAUSTED GASES

摘要

For the degradation of sulphur-containing pollutants such as, for example, H2S, CS2, COS and also organic sulphur compounds such as thioalcohols, thioethers and thiophenes in waste gases, a biological conversion process is proposed, the essential constituent of which is a packed reactor (4). The packing of the reactor (4) is colonised by immobilised microorganisms from the family of the Thiobacillaceae, which are always kept moist, so that the metabolic products of the microorganisms are dissolved in the moisture and are continuously discharged. This produces in the reactor (4) or in the zone of the microorganisms a steady concentration gradient for sulphate ions, which are neutralised in a second reactor (7) by addition of alkali (sodium or potassium hydroxide solution) and form readily soluble salts. These readily soluble salts are converted in a third reactor (8) by addition of milk of lime into crystals which are sparingly soluble in water (gypsum crystals), an alkaline solution for the reactor 7 resulting, which can be recirculated, whereby losses of chemicals are largely avoided. The sparingly soluble crystals from the reactor (8) are suitable for landfill or can be utilised. The supernatant low in sulphate is passed through the biological treatment plant (2) to the water course (3). …IMAGE…