Phytoremediation of Three Herbaceous Plants to Remove Metals from Urban Runoff

摘要

Phytoremediation experiments were carried out to assess the ability of different herbaceous buffer strips to absorb metals. Results revealed the Medicago sativa buffer strip had the best removal capacity for copper, lead, and cadmium in the runoff and seepage flow. Copper and lead content in M. sativa were significantly higher than in Lolium perenne and Poa pratensis (p0.05). Cadmium content in P. pratensis was significantly higher than in L. perenne and M. sativa(p0.05). Total accumulation of copper and lead in M. sativa buffer strips was 13.45mgkg(-1) and 1.01mgkg(-1), respectively. Total cadmium accumulation was approximately 0.50mgkg(-1) in both M. sativa and P. pratensis. Overall, results indicated that using M. sativa in the buffer strips was optimal for the remediation of copper, lead, and cadmium in sewage water.