不同热解温度和热解时间下污泥基生物炭的理化特性研究

为探究微波热解制备的污泥基生物炭的理化特性,以污泥为研究对象,设置5个热解温度和3个热解时间探究热解工况对污泥基生物炭理化特性的影响。结果表明:热解后生物炭中的C百分比降低,污泥基生物炭比表面积最大为55.13 m^(2)/g;污泥基生物炭的TP含量增加,P的保留率最大为91%;生物炭中重金属出现富集现象。对生物炭中重金属进行形态分布分析,发现Cr的F2形态占比由22%降低到11%,Cu的F2形态由11%降低到3%,Zn的F3+F4形态占比由57%增加到83%。重金属的稳定态占比增加,有利于生物炭中重金属的固化。

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 m^(2)/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.