污泥生物炭对土壤养分及重金属的影响

Effect of sludge biochar on soil nutrients and heavy metals

采用未、酸、碱改性污泥生物炭(SC1、SC2、SC3)修复受重金属单一污染(Cu、Zn、Cd)的土壤,研究生物炭对土壤理化性质、养分指标及重金属形态分布的影响。结果表明,施加三种SC后,土壤pH值与电导率均显著增加;阳离子交换量、有机质、有效磷及速效钾等养分指标也均呈现积极影响,即阳离子交换量在SC3的处理下提升效果更好,有机质与有效磷含量在SC2的处理下增加更为显著,速效钾含量的提升均在50%左右;三种重金属则在SC3的处理下修复固化效果更好。

Soils contaminated with heavy metals(Cu,Zn,Cd)were remediated with un-,acid-and alkali-modified sludge biochar(SC1,SC2 and SC3).The influence of soil physical and chemical properties,nutrient indexes and heavy metal morphological distribution were investigated.The results showed that soil pH and conductivity increased significantly after the application of the three SCs;nutrient indexes such as cation exchange,organic matter,effective phosphorus and quick-acting potassium were also positively affected,i.e.,the cation exchange was improved better under the treatment of SC3,the content of organic matter and effective phosphorus was increased more significantly under the treatment of SC2,and the content of quick-acting potassium was improved around 50%;the repair and curing effect of the three heavy metals was better under the treatment of SC3.