期刊
ENVIRONMENTAL POLLUTANTS AND BIOAVAILABILITY
卷 35, 期 1, 页码 -出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/26395940.2023.2205011
关键词
Sewage sludge; heavy metals; passivation; phytotoxicity; potassium feldspar
Effective passivation of heavy metals in sludge is crucial for its land use. GxK900, a modified potassium feldspar with lower crystallinity, higher specific surface area, and cationic exchange capacity, was chosen to passivate heavy metals in the sludge. The optimal 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 showed that adding 10% passivated sludge enhanced ryegrass growth without significantly affecting the contents of Cu, Cr, Zn, and Pb in the roots and above-ground parts. The transfer factors of the four metals were all less than 1. The use of passivated sludge as a growing medium for landscaping plants provides a theoretical basis for sludge land use and a resource outlet for potassium feldspar minerals.
Effective passivation of heavy metals in sludge is the key to achieve its land use. Potassium feldspar was modified to obtain GxK900, with a lower crystallinity, a higher specific surface area and cationic exchange capacity. GxK900 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.
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