Process for the biological purification of waste waters from yeast and sugar factories, distilleries and other factories

摘要

284,267. Aktieselskabet Dansk Gaerings Industri, (Assignees of Lesienicka Fabryka Drozdzy prasowanych i spirytusu Spolka Akcyjna (Lesienitzer Spiritus und Presshefefabriken Akt.-Ges.)). Jan. 26, 1927, [Convention date]. Bacteriological processes.-The waste waters from distilleries, and from yeast, sugar, and other factories utilizing molasses are purified by the action of aerobic or anaerobic betaine-destroying micro-organisms, a "starting-stock " of a pure culture of such organisms being first prepared, for example by inoculating a concentrated solution of betaine with putrescent beetroots or decaying molasses. By means of this culture the betaine and its derivatives and transformation products are decomposed into carbonic acid, ammonia, and formic acid. In a second stage the vegetable acids, particularly the formic acid, are removed by bacterial decomposition. The waste water containing humus may also be treated with suitable organisms, which may be used in the first or second stage of the process. Albuminous substances may be removed by albumen-decomposing bacilli, such as putrifucus, mesentericus, or vulgatus, or by filtering, or the yeast cells are removed mechanically and destroyed by plasmolysis, or by heating, and finally treated with albumen-decomposing microorganisms. By the use of pure cultures, and by carrying out these processes under controlled conditions, the production of hydrogen sulphide is prevented. The Figure shows diagrammatically a plan of a plant for carrying out the process. The filtered &c. waste water is neutralized by milk of lime and run into a closed decomposing basin I; thence it passes to a small shallow clarifying-basin Ia, the bottom of which forms a flat funnel for the settling bacteria. Thence the waste water passes to a. second decomposing tank II with an adjoining settling-basin IIa. A stock of pure betaine bacteria is propagated in a vessel III and run into the basin I say once a week, and a culture of bacterium formicicum Ometianski is propagated in the receptacle IV and run into the basin II to decompose the formic acid and other humus products. A short stimulation by aeration is desirable when a fresh culture is added; phosphates may be added to accelerate the action. A short supplemental treatment of the waste water in a fish-pool may follow. Humus-destroying bacteria may be placed in either basin I, II. Specification 307,587 is referred to.