The Use of Frozen Colloidal Sediments of Sludge-Lignin of OJSC "Baikal Pulp and Paper Mill" as Soil

Abstract

A series of industrial experimental tests on the freeze treatment of colloidal sludge lignin precipitates was carried out under natural conditions. Changes in the physical and chemical properties of the precipitates were studied. It is established that three fractions are formed following the freeze treatment of colloidal sludge lignin precipitates, including demineralized water (up to 25 %), mineralized water (up to 15 %) and a restructured colloidal precipitate (up to 60 %). The total volume of the precipitate is shown to decrease to 40 %. Freezing precipitation of colloidal lignin slurry of "the Baikal Pulp and Paper Mill" leads to a decrease in toxicity from the third to the fifth class of danger. On the basis of frozen sediments, the lignin sludge of OJSC Baikal Pulp and Paper Mill with the addition of other waste from the Baikal region, a fertile soil was obtained that corresponds to GOST R 54651-2011 "Organic fertilizers on the basis of sewage sludge. Specifications".

Artificial soils for restoration of disturbed land productivity

“…The suitability of lignin slurries for the reclamation purposes has been evaluated in a study of the St. Petersburg Mining University [41]. Similar studies were carried out for the conditions of the Baikal region [42,43]. Confirmation of this method of using waste is also in foreign studies [44].…”