EXTRACTION TECHNOLOGIES FOR PROCESSING WASTES FROM FOREST INDUSTRY AND CROP PRODUCTION (A REVIEW)

Despite the increasing contribution of integrated approaches to processing waste from the forest industry and crop production, the main method of recycling plant wastes is still combustion, which leads to losses of valuable substances. An alternative and advanced way of plant waste processing is extraction to obtain useful substances. The previously published data on the extraction-based methods to isolate valuable substances from wood waste and straw of various crops under industrial and laboratory conditions are generalised in this work. The data on the chemical composition of wastes from forest industry and crop production, as well as on the content of chemical compounds of practical significance are systematised. The basic approaches to retrieve such valuable components as lignin, furfural, waxes, organic acids, polyphenols, dyes, silicon dioxide and others from plant wastes are described.