Abstract
Abstract Dibenzo-p-dioxin (DBD) and dibenzofuran (DBF) appear to be important precursors to chlorinated dioxins formed during chlorine bleaching of pulp. Reducing the concentration of the precursors prior to chlorination may reduce the formation of dioxins. The high reactivity of electrophilic chlorine with the precursors in pulp suggests that ozone, another electrophilic reagent, may effectively reduce precursor levels in pulp. The goal of this work was to find optimal conditions for ozone destruction of DBD and DBF in pulp. Very mild conditions were unsuccessful at removing DBD and DBF, however conditions of 2% ozone charge, high consistency and slow ozone delivery rates reduced DBD and DBF by 83% and 68%, respectively. In general, conditions which enhance delignification also enhanced precursor degradation. Exposure of pulp to ozone prior to chlorination may remove enough DBD and DBF to significantly reduce chlorinated dioxin formation with chlorine bleaching.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
