Decerebration (DECEREBRATION)

DECEREBRATION, DECEREBRATION RIGIDITY. Drops are passed through an aerator from metal sieves A and made to fall through the air from a height of about 2 meters onto a sand filter. Before the latter, it is advisable to provide a settling basin. In closed installations, deferrization is carried out in special apparatuses. Each of them represents a i^irA\ /'I¹':'.; d 5шД*=»- Figure 2. Diagram of an installation for deferrization by the Esten method: A-sieve; B-filter; C-pipeline. a riveted, hermetically sealed iron reservoir, 1.5-2 meters in diameter, 3-5 meters high; loaded with coke, sand or wood shavings, through which water is passed at a speed of 5 or more meters per hour. Sometimes, before passing the water into the apparatus, it is aerated by mixing air with it. The well-known Bred apparatuses (Germany), loaded with lava coke, have gained considerable popularity. In terms of consistent good results, open installations are apparently better than closed ones. The latter may have an advantage over open ones in cases where it is necessary to prevent the volatilization of CO₂ from the purified water, which is necessary in certain cases to retain the salts of temporary hardness in the water. The above methods of D. apply to iron waters with low oxidizability (1-3 mg O₂). D. of waters with high oxidizability, rich in humus substances, is much more complicated. To separate iron oxide from compounds with humus substances, it is necessary to resort to chemical substances such as: chloride of lime, aluminum sulfate, lime, etc., for oxidizing humus substances or for coagulating humic iron oxide.