a Environmental Sciences, College of Basic Science & Humanities, G. B. Pant University of Agriculture and Technology , U. S. Nagar , Uttarakhand , India.
b Environmental Science, College of Basic Science & Humanities, G. B. Pant University of Agriculture and Technology , Pantnagar, Udham Singh Nagar , Uttarakhand , India.
Int J Phytoremediation. 2018 Jul 29;20(9):876-884. doi: 10.1080/15226514.2018.1438359.
The present study assessed Zn, Cr, Cd, and Pb removal efficiency of Colocasia esculenta, Hydrilla verticillata, Phragmitis australis, Typha latifolia, and Spirodella polyrhiza from sewage-mixed industrial effluent. The fresh/dry weight and relative growth rate of each macrophyte decreased with increasing effluent concentration. H. verticillata and C. esculenta exhibited better growth at 50% effluent over control. The maximum Zn, Cd, and Pb accumulation (1008.23, 28.03, and 483.55 mg/kg dry wt., respectively) was recorded in C. esculenta, whereas Cr (114.48 mg/kg dry wt.) in H. verticillata at 100% effluent. Metal accumulation in roots of all plants species was higher (≥50%) initially with increasing effluent concentration and later transferred to shoots. All plants exhibited BCF >1.0 for all heavy metals, highest being for Zn (91.2) and Cd (75.2) in H. verticillata, for Cr (97.9) and Pb (103) in C. esculenta. Except S. polyrhhiza, all other plants exhibited TF <1.0. Maximum removal efficiency of Zn was 82.8% by H. verticillata, whilst that of Cr, Cd, and Pb by C. esculenta at 50% effluent, demonstrating wide applicability of H. verticillata and C. esculenta for treatment of mixed industrial effluent having heavy metals.
本研究评估了芋头、水鳖、芦苇、香蒲和螺旋藻从污水混合工业废水中去除锌、铬、镉和铅的效率。每种大型藻类的鲜/干重和相对增长率随着污水浓度的增加而降低。水鳖和芋头在 50%污水中比对照生长更好。芋头对锌、镉和铅的最大积累量（分别为 1008.23、28.03 和 483.55mg/kg 干重），而水鳖对铬的积累量（114.48mg/kg 干重）最高。所有植物物种的根部最初对所有重金属的积累（≥50%）随着污水浓度的增加而增加，然后转移到地上部分。所有植物对所有重金属的 BCF 均大于 1.0，其中水鳖对锌（91.2）和镉（75.2）的 BCF 最高，芋头对铬（97.9）和铅（103）的 BCF 最高。除了螺旋藻外，其他所有植物的 TF 均小于 1.0。水鳖对锌的最大去除效率为 82.8%，而在 50%污水中芋头对铬、镉和铅的去除效率最高，表明水鳖和芋头对处理含有重金属的混合工业废水具有广泛的适用性。
