The Effects of Chlorination Conditions on the AOX and Chlorinated Phenol Content of Kraft Bleach Plant Wastewaters

Autor:	Keith L. Mackie, Paul N. McFarlane, Thomas A. Clark, Robert W. Allison
Rok vydání:	1991
Předmět:	Chlorine dioxide Environmental Engineering Bleach Inorganic chemistry chemistry.chemical_element Halide Kappa number Pulp and paper industry Oxygen chemistry.chemical_compound chemistry polycyclic compounds Chlorine Phenol Kraft paper Water Science and Technology
Zdroj:	Water Science and Technology. 24:55-63
ISSN:	1996-9732 0273-1223
DOI:	10.2166/wst.1991.0462
Popis:	A central composite experimental design was used to develop models of the yields of Adsorbable Organic Halide (AOX) and chlorophenolic compounds in wastewaters produced by bleaching oxygen delignified kraft pulps. The following five variables were used to control the bleaching conditions: total available chlorine, chlorine dioxide substitution, incoming kappa number, chlorination time and temperature. The total available chlorine and the chlorine dioxide substitution were the most important parameters in all the models developed. The yields (g.tonne−1) of AOX and total chlorophenolic compounds increased linearly with increasing total chlorine application. Elevating the level of chlorine dioxide substitution caused the yield of AOX to decrease linearly while the yield of total chlorophenols diminished in a non-linear manner. Increasing the level of chlorine dioxide substitution at a given total chlorine application is an effective means of reducing the emissions of both AOX and chlorinated phenols.
Databáze:	OpenAIRE
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