The effect of granulation on the sorption properties of peat

The granulation of peat samples of various humidity was carried out by extrusion on screw and matrix granulators. It was found that for granulation on a screw granulator, the optimal humidity is in the range of 60–73 %, and for a matrix (pellet) – 21–35 %. It is shown that in terms of sorption properties and absorption rate from the gas phase of an aqueous solution of ammonia, water and ammonia, samples of granular peat are more effective than the original peat. The study of absorption kinetics has shown that, along with the mechanism of direct interaction of ammonia with carboxylic, phenolic and other reactive groups of peat organic matter, a significant contribution to the total absorption of ammonia is made by the fixation of ammonia due to less strong forms of bonding. Chemically, i. e., about 8 % of the sorbed ammonia is fixed in the exchange and in the form of inactive chemical compounds. Spectral methods have confirmed that the binding of ammonia by peat is due to a strong ion-exchange interaction with free carboxyl groups until they are almost completely replaced by ammonium ions, as well as the formation of hydrogen bonds of ammonia with the structural matrix of peat. The effect on the sorption and water-physical properties of the diameter of granules obtained by extrusion on a screw granulator has been established: with an increase in the diameter of granules, water absorptionм

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