| Abstract: | In a storage reservoir with a hypolimnic volume of 3.5 hm3 the water contains 40 mg/l nitrate. A straw bale of 60 by 20 by 1.5 m was introduced as a reactor. Hypolimnic water having been polluted with a waste product of the fatty acid synthesis (30 … 20% formic, acetic, propionic, butyric and valeric acids) were pumped through it. By the use of a total of 43.8 t fatty acid mixture from June to August an additional oxygen depletion of 14 t O2 is achieved and 49 t NO3? are removed at the same time. The ammonium concentration did not increase, the NO2? concentration, however, rose to 12 … 13 mg/l NO2 at times. The fatty acids were used up save 0.1 mg/l. The increase of the NO2? concentration, of the number of germs and of the iron, manganese and phosphorus back solution due to the controlled anaerobic conditions is the drawback of the process. |
