Discussion
Elemental chlorine was replaced in bleaching mainly because it
Answer: B
Correct answer: formed chlorinated organics in the effluent
Elemental chlorine reacting with residual lignin produced chlorinated organic compounds, measured as adsorbable organic halides, including dioxins. That is what drove the shift to chlorine dioxide, which does the same job with far less halogenated by-product, and to the totally chlorine free sequences using oxygen, ozone and peroxide. Chlorine bleached perfectly well; it was the effluent that ended it.
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