Effects of Maize Straw Addition on Nutrition Availability and Heavy Metal Activity in Lead/Zinc Tailings
It is difficult to achieve ecological remediation of lead/zinc tailings for its extreme arid and high heavy metal content. Effects of maize straw application on available nitrogen and potassium concentration and heavy metal activity in lead/zinc tailings were investigated through a greenhouse experiment. Results indicated that applying straw could increase available nitrogen and potassium concentration in lead/zinc tailings,and the improving effects were enhanced with the increase of applying dosage. Straw decay affected the availability of Pb,Zn,Cu and Cd,with the sensitivity to straw activation in order of Cd Zn Cu Pb. With the increase of the dosage of straw,the stabilization effect became stronger. Considering the effects of different application dosage of straw on availability of nitrogen and potassium and activity of trace metals,it was suggested that the addition of 2%(W/W)straw could be conducive to ecological remediation of lead/zinc.