ABSTRACT

Effective passivation of heavy metals in sludge is the key to achieve its land use. Potassium feldspar was modified to obtain G×K900, with a lower crystallinity, a higher specific surface area and cationic exchange capacity. G×K900 was chosen to passivate heavy metals in the sludge, and the best passivation conditions were 30% addition and a 10-day passivation period. The passivated sludge extract had no adverse effects on ryegrass germination and promoted radicle growth. The pot experiment revealed that adding 10% passivated sludge encouraged ryegrass growth while having no appreciable impact on the contents of Cu, Cr, Zn and Pb in the roots and above-ground parts compared to control treatment. The transfer factors of the four metals were all less than 1. Passivated sludge was used as a growing medium for landscaping plants, which provided a theoretical foundation for sludge land use and a resource outlet for potassium feldspar minerals.

摘要

污泥中重金属的有效钝化是实现其土地利用的关键。钾长石改性得到G×K900，具有较低的结晶度、较高的比表面积和阳离子交换容量。选择G×K900钝化污泥中的重金属，最佳钝化条件为添加量30%，钝化周期10天。钝化污泥提取物对黑麦草发芽无不利影响，并促进胚根生长。盆栽试验表明，与对照处理相比，添加10%钝化污泥促进黑麦草生长，同时对根部和地上部分Cu、Cr、Zn和Pb含量无明显影响。四种金属的转移因子均小于1。钝化污泥被用作园林绿化植物的生长介质，