|
| Generation, distribution and toxicity characteristics of polycyclic aromatic hydrocarbons during the preparation of biochar from rapeseed cake |
| Received:April 17, 2016 |
| View Full Text View/Add Comment Download reader |
| KeyWord:biochar, bio-oil, polycyclic aromatic hydrocarbons, toxic equivalency, environmental safety |
| Author Name | Affiliation | E-mail | | LUO Fei | Shenzhen Academy of Environmental Sciences, Shenzhen 518001, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | SONG Jing | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | CHEN Meng-fang | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | mfchen@issas.ac.cn |
|
| Hits: 2920 |
| Download times: 3443 |
| Abstract: |
| In the present study, rapeseed cake was slowly pyrolyzed under anoxic conditions at 300, 500, and 700℃. The generation, distribution and toxicity characteristics of PAHs(polycyclic aromatic hydrocarbons) in both biochars and bio-oils were investigated. The results showed that the amount of generated PAHs decreased with increasing pyrolysis temperature. When produced between 300 and 700℃, PAHs concentrations ranged from 42.7 to 1 460.8 μg·kg-1 in biochars and from 5 799.9 to 53 151.0 μg·kg-1 in bio-oils, respectively. Light molecular weight PAHs(2 rings, 3 rings and 4 rings) were the dominant components, accounting for 97.4%~98.8% in biochars and 97.8%~99.0% in bio-oils. More than 97% of the PAHs mass were allocated in the bio-oil phase whereas only a small portion existed in the carbon material. 5 ring PAHs were the major contributors to the toxic equivalency of BaP(TEQBaP) of biochars and bio-oils. Higher temperature is recommended for production of biochars from rapeseed cake due to lower PAHs generation and lower potential cancer risk. |
|
|
|
