wastewater treatment, showed variable degrees of uptake and accumulation of Pb. As CW is a bioremediation mechanism based system, its metal removal efficiency depending on phytoaccumu- lation, sedimentation, microbial accumulation, and the nature of the plant species (Kadlec and Knight, 1996). Plants (Echornia cras- sipes) are helping to prevent precipitation to the bottom and metals are sorbed by macrophytes (Maine et al., 2009). Furthermore, emergent plants contribute to reclamation of wastewater through a variety of physical, chemical and biochemical processes which enhance metal retention by the sediment (Brix, 1997; Kadlec et al., 2000). Plant uptake and accumulation of Pb varied from species to species and metal concentration in plant tissue was higher in roots than in aerial parts (Table 5). Concentrations of Pb ranged from 3.8 to 7.2 mg/kg in the root tissues, while varied from 1.5 to 3.2 mg/kg in the aerial tissues. These results are generally comparable with those previously reported in the literature (Vymazal et al., 2007). The highest Pb concentration (root þ aerial tissues) was found in the Pistia stratiotes species with RCF and ACF of 4.8 and 2.2, respectively (Table 6). This plant species is assumed to be hyper- accumulator for Pb, therefore, can be use for removal of Pb from
wastewater. The trends of Pb uptake and accumulation in different plant species were in the order of P. stratiotes > Ceratophyllum demersum > Lemna gibba L. > Carex aquatitis > Typha lat- ifolia > Juncus articulatus > E. cressipes > Scirpus cypernius > Alisma
plantago-aquatica > Polygonum glabrum > Phragmites australis.
wastewater treatment, showed variable degrees of uptake and accumulation of Pb. As CW is a bioremediation mechanism based system, its metal removal efficiency depending on phytoaccumu- lation, sedimentation, microbial accumulation, and the nature of the plant species (Kadlec and Knight, 1996). Plants (Echornia cras- sipes) are helping to prevent precipitation to the bottom and metals are sorbed by macrophytes (Maine et al., 2009). Furthermore, emergent plants contribute to reclamation of wastewater through a variety of physical, chemical and biochemical processes which enhance metal retention by the sediment (Brix, 1997; Kadlec et al., 2000). Plant uptake and accumulation of Pb varied from species to species and metal concentration in plant tissue was higher in roots than in aerial parts (Table 5). Concentrations of Pb ranged from 3.8 to 7.2 mg/kg in the root tissues, while varied from 1.5 to 3.2 mg/kg in the aerial tissues. These results are generally comparable with those previously reported in the literature (Vymazal et al., 2007). The highest Pb concentration (root þ aerial tissues) was found in the Pistia stratiotes species with RCF and ACF of 4.8 and 2.2, respectively (Table 6). This plant species is assumed to be hyper- accumulator for Pb, therefore, can be use for removal of Pb fromwastewater. The trends of Pb uptake and accumulation in different plant species were in the order of P. stratiotes > Ceratophyllum demersum > Lemna gibba L. > Carex aquatitis > Typha lat- ifolia > Juncus articulatus > E. cressipes > Scirpus cypernius > Alismaplantago-aquatica > Polygonum glabrum > Phragmites australis.
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