Behavior of 2-(3,5-di-tert-butyl-2-hydroxyphenyl)benzotriazole (DBHPBT) and 2-(3,5-di-tert-butyl-2-hydroxyphenyl)-5-chlorobenzotriazole during incineration of solid waste contaminated with thousand mg/kg levels of DBHPBT

摘要

2-(3,5-Di-tert-butyl-2-hydroxyphenyl)benzotriazole (DBHPBT) is classified as a "Class I Specified Chemical Substance" by the Chemical Substance Control Law, Japan, meaning that DBHPBT has comparable nature and toxicity to well-known Persistent Organic Pollutants (POPs). In this study, we performed a combustion experiment of solid waste containing DBHPBT using a pilot-scale incinerator to determine the destruction behavior of DBHPBT and the effects on emission of 2-(3,5-di-rert-butyl-2-hydroxyphenyl)-5-chlorobenzotriazole (DBHPCBT), which is structurally similar to DBHPBT and has a persistent nature, and nitrogen oxides (NOx). DBHPBT was destroyed mainly in the primary combustion zone. Overall destruction efficiency of DBHPBT in input at the concentration of 5000 mg/kg was ＞99.9999%. The input amount of DBHPBT did not affect the formation and destruction behavior of DBHPCBT and NOx. These results indicate that appropriate management of combustion conditions and flue gas treatment can minimize the emission of DBHPBT.