| 摘要 |
The invention relates to a method and apparatus for managing liquid streams in a cellulose pulp mill having a digester (210), a bleach plant (212) and at least first, second and third loops (94-97) of liquid streams in the pulp mill, the loops having liquid streams therein of significantly different contamination levels, the contamination level gradually increasing from the first loop to the third loop. The method comprises the steps of: (a) sensing (in 309, 98) the contamination level in at least the first and second loops; (b) when the contamination level in the first loop exceeds a predetermined level, discharging some of the contaminated liquid from the first loop to the second loop, and replacing it with less contaminated liquid; (c) when the contamination level in the second loop exceeds a predetermined level, discharging some of the contaminated liquid from the second loop to the third loop, and replacing it with less contaminated liquid; and (d) purifying (e.g. in 229 230, 231) the most contaminated liquid from the loops to produce the less contaminated liquid for addition to at least step (b). <IMAGE> |
