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Wastepaper reclaimed for recycling can be classified to two categories. One, to which newsprint and magazine waste belong, contains lignin. The other, which is mostly fine paper waste, consists of wood free chemical pulp. The former is bleached with peroxides and reducing agents, and the latter is done by chlorine chemicals.Recently, wood containing waste contaminates wood free waste, which causes troubles at bleaching with chlorine chemicals. Moreover, clorine chemicals are not favorable to environment. So, bleaching with peroxides and reducing agents is an alternative to it.This paper describes characteristics of several bleaching agents such as chlorine and chlorine dioxide as chlorine chemicals, hydrogen peroxide, persulfate and organic peroxides as peroxides, and hydrosulfite, borohydride and thiourea dioxide as reducing agents. Then, practical systems for bleaching newsprint waste and fine paper waste are introduced respectively.

Bleaching Chemicals for Recycled Pulp.