Patent ID: 8632655

Claim:
A method in the connection of pulp washing at a chemical pulp mill comprising: alkaline cooking of cellulosic material utilizing cooking liquor for producing brown stock pulp, washing the brown stock pulp in essentially closed successive liquid wash cycles, wherein a washing device in a last of the liquid wash cycles includes at least one of a washing device based on pressing of pulp, a press and a washing press, beaching the washed brown stock using ECF-bleaching, wherein the bleaching includes a first bleaching stage and a discharge for chloride-containing effluents formed during the bleaching, and purifying the chloride-containing effluents with a biological agent, introducing at least 1 m 3 /adt of the purified chloride-containing effluents as a dilution liquid into the washed brown stock pulp downstream of the last washing device, press or washing press, and the purified chloride-containing effluents flow with the washed brown stock pulp to the first bleaching stage.