Maize And Sedum Alfredii H Remediation Of BDE-209and Heavy Metals

Unregulated e-waste recycling activities have led to severe decabrominated diphenyl ether（BDE-209）and heavy metals combined pollution in E-waste dismantling region. Theenhancing effects of low molecular weight organic acids (LMWOA) and rhamnolipids(abiosurfactant) and Bacillussubtilis to the phytoremediation efficiency of single and combinedmaize and Sedumal fredii H on solving the combined contaminations of BDE-209and heavymetals（Zn and Cd）were investigated.Results showed that:(1) Combined maize and Sedumal fredii H significantly improve the removal rate of BDE209and Zn and Cd. The removal rate of BDE209and Zn and Cd of co-planting were47.6%-61.7%for Zn,3.72-78.56mg/pot and0.82-1.75mg/pot for Cd.which were1.2-11.6fold than single planting.(2) Rhamnolipid significantly improved the removal rate of BDE-209and Zn and Cd for alltreatments,which were higer28.6-49.9%for BDE-209and26.7-63.2%for Zn and53.5-82.4%for Cd than treamtments without rhamnolipid.Low molecular weight organic acidssignificantly enhance maize removing Zn and Cd and BDE209but significantly decrease theremoval rate of Sedumal fredii H for BDE-209and Zn and Cd.(3) The most effiency treatment to removing BDE-209and Heavy metals (Zn and Cd) wasco-planting with rhamnolipid (the removing rate was61.7%for BDE-209and78.56mg/potfor Zn and1.75mg/pot for Cd).