The technology using the sulphate cellulose from coniferous wood allow for the lignin solubilization, polymer witch exist in chemical composition of wood.The sulphate cellulose purification realized by diffusion process, with industrial water, process which has as a result residual water with alkalilignine pollutant hardly biodegradable. The abatement residual water pollution degree process reported of the Alkalilignine precipitation in acid medium realized with chorine hydride. After lignin separations residual water can be reused in normal biological depuration, excluding primary and second existing steps.
