Study on drying and carbonization characteristic of dyeing wastewater sludge

概要

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Carbonization is a kind of pyrolysis process to produce char from organic materials under an inert atmosphere. In order to evaluate the quality of char as fuel, proximate analysis and caloric value were examined. The composition of raw sludge had a significant influence on the quality of produced char. The higher the ratio of carbonate and volatile matter in sludge, the higher caloric value of char produced. Moreover, an equation to estimate caloric value of char was developed by using the weight fraction of fixed carbon and volatile matter in char. Temperature's control was performed to improve the quality of char. But the char's caloric value was lower than common fuel such as coal, petrol, briquet etc. Therefore, the char was mixed with high caloric value's matter such as coal, briquet etc. for using available fuel. In this study, chars derived from various sludge were characterized from the standpoint of fuel recovery and reducing quantity of sludge. Industrial wastewater sludge such as dehydrated sludges, dried sludge were carbonized at 350°C, 450°C and 550°C for 20 - 30 min. under anoxic.From results, carbonization could be considered as a reducing quantity of sludge, as well as for fuel recovery.
一般社団法人廃棄物資源循環学会の論文