residue problem
4.This article summarized the biodegradation process of main components of wood in nature and the research situation, the facing problem and the progress tendency of bioconversion to useful products using wood residue, including bioconversion to ethanol, single cell protein, xylitol and lactic acid.
5.To solve the problem of adverse influence on the environment exerted by the residue dye liquid from traditional dyeing of wool with acid mordant dyes by after-chroming, and to lessen the pressure of chromium-containing waste water treatment, the dyeing method was modified by adopting two-bath dyeing technique in which the initial dyeing liquid and mordant dyeing liquid could be used in the recycled way, thus saving dyestuff and reducing the drainage of chromium-containing waste water.

