Perspectives of bark dump recycling at wood processing enterprises

Abstract

Woodworking and pulp-and-paper mill areas accumulate significant volumes of wood debarking waste, which is stored in bark dumps with a volume of up to 1 000 000 m3. Methods for recycling bark, both fresh and stagnant, are proposed through the production of fuel briquettes and pellets, composting, building materials, and the use of combustible gases that accumulate in the depths of the old bark layers. Characteristics of extractive substances obtained from bark are given and their fields of application are considered. Possible ways of recultivation of old bark dumps, ways of waste water treatment are offered. The recommendations on reduction of technogenic hazard of bark dumps are given and the necessity of constant monitoring of such objects is grounded. The technological scheme of complex use of bark dump materials on the basis of developments of Saint-Petersburg State Forest Technical University is proposed.