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Effects of feedstock type, production method, and pyrolysis temperature on biochar and hydrochar properties

TitleEffects of feedstock type, production method, and pyrolysis temperature on biochar and hydrochar properties
Publication TypeJournal Article
Year of Publication2013
AuthorsSun, Yining, Gao Bin, Yao Ying, Fang June, Zhang Ming, Zhou Yanmei, Chen Hao, and Yang Liuyan
JournalChemical Engineering Journal
Abstract

This work explored the effect of temperature, production method, and feedstock type on the physicochemical and biological properties of biochars and hydrochars. Biochars and hydrochars made at lower temperatures had higher production rates. Higher pyrolysis temperatures could not only increase carbon content of biochars but also produce higher thermal stability biochars, which only started to decompose in air after 400~450 °C. The production method showed strong effect on biochar properties. Compared to the dry-pyrolysis biochars derived from the same feedstocks, the hydrochars had more acidic pH values and lower carbon contents. The results showed that feedstock types can also influence characteristics of the biochars. All of the chars showed no statistically significant effects on plant seed germination and seedling growth and thus could be used as soil amendment. Our findings indicated that biochars with different properties could be developed by changing production conditions to better satisfy their environmental applications.