6020
This study demonstrates that a Fenton / US process can effectively decolour the direct azo dye DB15 in wastewater .
 Chemical: azo; Chemical: DB15
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: azo; Chemical: DB15