Assessment of the possibility of using the method of sludge-lignin dehydration of the Baikal Pulp and Paper Mill by the freeze-thaw method

Abstract

An estimation of the possibility of dehydration of sludge-lignin of the Baikal Pulp and Paper Mill by the freeze-thaw method was carried out. Change of sludge-lignin structure, physicochemical properties and chemical composition after freeze-thaw are shown. Toxicity and chemical composition of the water solution separated from the sludge-lignin during its freeze-thaw is estimated. An increase in the rate of germination of seeds of the cress in the soil with the addition of the frozen-out sludge-lignin in the ratio "sludge-lignin-soil" 1:3-1:4 is shown. Possibility of application and recommendations for the use of freezed out sludge-lignin as an organic fertilizer is considered. Principal possibility of the worm transformation of sludge-lignin, previously dehydrated by the freeze-thaw method, by red Californian worms Eisenia foetida Andrei Bouche (1972) is shown. The issue of prospects for processing this waste in a fertile bio-soil is discussed. The latter can later be used for recultivation of the territory of the sludge accumulator plots of the Baikal Pulp and Paper Mill.

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].…”