生物炭去除土壤重金属研究进展

Research progress of heavy metals removal in soil by biochar

针对生物炭作为新型土壤改良剂的研究进展,介绍了生物炭制备方法,分析了生物炭与土壤重金属作用机制,探讨了生物炭联用技术。分析认为:原料、热解温度、热解时间等制备条件对生物炭去除重金属效果有不同程度的影响,热解温度影响程度最高,可以通过优化热解温度等条件制备生物炭;生物炭与土壤重金属间有直接和间接两种作用方式,不同生物炭与重金属间的作用机理也存在差异,需要深入了解作用机制并选择合适的生物炭;相比于单一生物炭施用,与碱性物质和堆肥技术联用可强化协同作用并优化土壤修复效果。

Aiming at the research progress of biochar as a new type of soil amendment,the preparation method of biochar was introduced.The mechanism of biochar and soil heavy metals was analyzed,and the biochar hyphenated technology was discussed.It is concluded that the raw materials,pyrolysis temperature,pyrolysis time and other preparation conditions have varying degrees of influence on the removal of heavy metals by biochar.The pyrolysis temperature has the highest influence.The biochar can be prepared by optimizing the pyrolysis temperature and other conditions.There are two action modes between biochar and soil heavy metals:direct and indirect.The mechanisms between different biochar and heavy metals are different.It is necessary to study the mechanism and select the appropriate biochar.Compared with the application of single biochar,the synergistic and remediation effect of biochar can be improved by combining with alkaline substances and composting technology.