EFCT: Environmental Footprint Comparison Tool.  A tool for understanding environmental decisions related to the forest products industry.  Chlorinated Compounds. headerlink
Effects of decreased release of chlorinated compounds on discharge to water

Apart from eliminating the formation of the most environmentally significant dioxins and chlorinated phenolic compounds to less than measurable levels, the replacement of elemental chlorine with chlorine dioxide at North American pulp and paper mills also provides significant reduction in other chlorinated substances and effluent color. Quantifiable levels of 2,3,7,8-tetrachlorodibenzofuran (TCDF) are now rare, and 2,3,7,8-tetrachlorodibenzodioxin (TCDD) cannot be detected in routine effluent monitoring tests. Oxygen-demanding substances in mill effluent, typically measured as biochemical oxygen demand (BOD) and (COD), are more influenced by the extent of delignification prior to bleaching rather than by the bleach plant configuration itself.

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More information:

Wastewater and water quality impacts associated with pulp bleaching

Wastewater pollutants other than organochlorine compounds

Organochlorine compounds in wastewater