Laboratory of Forest Ecology, National Institute for Research in Rural Engineering, Water and Forests (INRGREF), University of Carthage, 2080, Ariana, Tunisia.
Department of Biology, Faculty of Sciences of Tunis, University of Tunis El Manar, 1060, Tunis, Tunisia.
Environ Monit Assess. 2021 Sep 16;193(10):653. doi: 10.1007/s10661-021-09438-8.
The use of fast-growing tree species, such as Casuarina glauca for wastewater treatment could improve the quality of wastewater and offer an ecological and sustainable system. A hydroponically experiment was conducted to evaluate C. glauca ability to remove heavy metals from secondary treated urban wastewater (SWW). The effect of the SWW on plant biomass, some physiological parameters, heavy metals (Cd, Pb, Ni and Zn) bioaccumulation and removal from wastewater was evaluated. After 28 days, wastewater treatment C. glauca showed high efficiency for the removal of pathogenic bacteria such as faecal coliforms and faecal streptococci from SWW. A significant reduction was found for electrical conductivity, biochemical oxygen demand, chemical oxygen demand and suspended solids with 31%, 92%, 83% and 31% respectively. Casuarina glauca plants were able to remove heavy metal ions Cd, Pb, Ni and Zn from SWW and the removal efficiency was 92%, 77%, 83% and 73%, respectively. Casuarina glauca plants accumulated concentrations of heavy metals (Cd, Pb, Ni and Zn) in their roots higher than the shoots. SWW had a remarkable effect on plant growth and photosynthetic capacity in C. glauca compared with plants grown in tap water (control). The results indicated that C. glauca can act as scavengers of heavy metal ions from polluted water and confirms their ability for wastewater treatment.
速生树种如木麻黄用于废水处理可以提高废水质量，并提供生态和可持续的系统。进行了水培实验，以评估木麻黄从二级处理城市废水中（SWW）去除重金属的能力。评估了 SWW 对植物生物量、一些生理参数、重金属（Cd、Pb、Ni 和 Zn）生物累积和从废水中去除的影响。28 天后，废水处理的木麻黄对从 SWW 中去除粪大肠菌群和粪链球菌等致病菌表现出很高的效率。电导率、生化需氧量、化学需氧量和悬浮物分别显著降低了 31%、92%、83%和 31%。木麻黄能够从 SWW 中去除重金属离子 Cd、Pb、Ni 和 Zn，去除效率分别为 92%、77%、83%和 73%。木麻黄植物根部积累的重金属（Cd、Pb、Ni 和 Zn）浓度高于茎叶。与在自来水中（对照）生长的植物相比，SWW 对木麻黄的生长和光合作用能力有显著影响。结果表明，木麻黄可以作为受污染水中重金属离子的清除剂，并证实了它们处理废水的能力。
