In order to explore the development law of physical and chemical properties of sludge-based biochar prepared by microwave pyrolysis,5 pyrolysis temperatures and 3 pyrolysis times were set to explore the influence of pyrolysis conditions on physical and chemical properties of sludge-based biochar.The results showed that the percentage of C in biochar decreased after pyrolysis,the specific surface area of sludge-based biochar was up to 55.13 m2/g,the TP content of sludge-based biochar was up to 91％,and the retention rate of phosphorus was up to 91％.Heavy metals were enriched in biochar.The analysis of the form distribution of heavy metals in biochar showed that the F2 state proportion of Cr form decreased from 22％to 11％.The F2 state of Cu decreased from 11％to 3％,and the F3+F4 state of Zn increased from 57％to 83％.The increase of the proportion of heavy metals in the stable state is conducive to the solidification of heavy metals in biochar.
sludge-based biocharheavy metalsphosphoruspyrolysis temperaturepyrolysis time
万方数据
维普
