| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention can be used in treating water from bleaching cellulose pulp. The method involves addition of a calcium compound or aluminium compound to waste water, where the calcium compound is selected from a group consisting of calcium oxide, calcium hydroxide and inorganic calcium salts, and the aluminium compound is selected from a group consisting of a sulphate of polymeric aluminium hydroxide, chloride of polymeric aluminium hydroxide and formate of polymeric aluminium hydroxide. First, the calcium compound and waste water are mixed into a solution with pH between 4.5 and 7, and the aluminium compound is the added to this solution to precipitate lignin. ^ EFFECT: high efficiency of removing lignin from waste water from bleaching cellulose. ^ 10 cl, 7 tbl, 1 ex |
