餐厨与污泥协同处理后生物碳土的利用研究

Exploration of Application of Biochar Used After the Coprocessing Anaerobic Digestion of Kitchen Waste and Sewage Sludge

该文以餐厨与市政污泥协同处理后的生物碳土为研究对象,研究了生物碳土对苗木的生长变化以及施用1 a后生物碳土中有机质、常量元素、重金属变化的影响。研究结果表明,控根容器与生物碳土相结合的苗木栽植方式,可以显著促进海棠、紫薇、红枫、桂花的生长;苗木生长1 a后,控根容器中有机质以及N、P、K含量显著降低,Cu、Zn、Pb、As为植物吸收主要的重金属元素;控根容器底部土壤有机质和N、P、K略高于底部土壤,Cu、Zn、Ba、S、Al为主要的淋出元素。因此,控根容器、生物碳土苗木栽培基质以及水肥管理等技术结合栽植"移动森林",不仅可以解决生物碳土的消纳问题,还可以实现增加生物碳土产品的附加值,是解决生物碳土及其副产品出路的一种可行的方式。

Based on the biochar after the coprocessing anaerobic digestion of kitchen waste and sewage sludge,the paper studied the effect of biochar on the growth of seedlings and the contents changes of organic substrate,macroelement and heavy metals in biochar after 1 year of application.Results on experiment showed that the combination of the root-control methods and biochar can significantly promote the growth of begonia,crape myrtle,red maple and osmanthus fragrans,and it is obtained after 1 year of seedling growth,organic substrate and N,P and K contents in root-control containers were significantly reduced,and Cu,Zn,Pb and As were the main heavy metal elements absorbed by plants.In addition,organic substrate and N,P and K contents at the bottom of the root-control containers were slightly higher than those and Cu,Zn,Ba,S and Al were the main leaching elements.Therefore,the technology of root-control,biochar seedling cultivation substrates and waterfertilizer management("mobile forest")can not only solve the problem of its utilization,but also increase the added values of biochar or its by-products,which is a feasible way to solve the biochar and its by-products.