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Luo J.,Wuhan University | Qi S.,Wuhan University | Peng L.,Wuhan University | Xie X.,Guangdong Hydrogeology Battalion
Bulletin of Environmental Contamination and Toxicology | Year: 2015

The objective of this research was to determine the phytoremediation potential of Eucalyptus globulus in Cd contaminated soil through two different harvest methods. Although replanting is more expensive than coppicing and produces less aboveground biomass, more Cd can be removed from the soil with roots removal at each harvest as the E. globulus absorbs vast majority of heavy metals in non-metabolically active parts like roots. Despite the higher cost of replanting in a single harvest, when phytoremediation efficiency and total duration are considered as important factors, the replanting treatment should be recommended as an appropriate method which can decrease the phytoremediation time obviously. © 2014 Springer Science+Business Media New York. Source

Luo J.,Wuhan University | Qi S.,Wuhan University | Gu X.W.S.,University of Melbourne | Hou T.,Guangdong Hydrogeology Battalion | Lin L.,Guangdong Hydrogeology Battalion
Bulletin of Environmental Contamination and Toxicology | Year: 2016

A long-term field experiment was designed to assess remediation efficiency and ecological risk of phytoremediation of Cd under different cultivation systems with or without ethylene diamine tetraacetic acid (EDTA). EDTA can significantly improve the phytoremediation effectiveness of a historically polluted e-waste dismantling site through enhancing Cd uptake by plants in all cultivation systems along with higher ecological risks to different receptors especially in the presence of Cicer arietinum (chickpea). Moisture content at each layer of soil profile under Eucalyptus globules L. cultivated sites was consistently lower than under chickpea monoculture as a result of E. globules' high water use efficiency. Besides low soil moisture, E. globules can intercept more Cd-rich leachate than chickpea regardless of the presence of EDTA. E. globules could be used for Cd phytoremediation as they can take full advantage of EDTA and decrease ecological risk caused by the chelator. © 2015 Springer Science+Business Media. Source

Luo J.,Wuhan University | Qi S.,Wuhan University | Gu X.W.S.,University of Melbourne | Wang J.,Guangdong Hydrogeology Battalion | Xie X.,Guangdong Hydrogeology Battalion
Ecotoxicology | Year: 2016

Previous studies have shown that phytoremediation usually requires soil amendments, such as chelates, to mobilize low bioavailability heavy metals for better plant absorption and, consequently, for remediation efficiency. A total dry biomass of 3.39 and 0.0138 kg per plant was produced by a phytoremediator, Eucalyptus globulus, and a nitrogen fixing crop, Cicer arietinum (chickpea), respectively. The accumulation of Pb in E. globulus and chickpea reached 1170.61 and 1.33 mg per plant (700 and 324 mg kg−1), respectively, under an ethylene diamine tetraacetic acid (EDTA) treatment, which was a five and sixfold increase over the value in untreated experiments, respectively. EDTA enhanced the phytoremediation efficiency and increased the heavy metal concentration in the soil solution. In pot experiments, approximately 27 % of the initial Pb leached from the spiked soil after EDTA and 25 mm artificial precipitation additions into soil without plants, which was considerably larger than the value under the same conditions without EDTA application (7 %). E. globulus planted in a mixed culture had higher water use efficiency than monocultures of either species in field experiments, and E. globulus intercepted almost all of the artificial precipitation in the pot experiments. This study demonstrates that E. globulus can maximize the potential of EDTA for improving the phytoremediation efficiency and minimizing its negative effects to the environment simultaneously by absorbing the metal-rich leachate, especially in a mixed culture of E. globulus and chickpeas. © 2016 Springer Science+Business Media New York Source

Luo J.,Wuhan University | Qi S.,Wuhan University | Gu X.W.S.,University of Melbourne | Wang J.,Guangdong Hydrogeology Battalion | Xie X.,Guangdong Hydrogeology Battalion
Journal of Cleaner Production | Year: 2016

Remediation effectiveness and environmental risks caused by phytoremediation processes under different cultivation systems were assessed at an electronic waste dismantling site. Non-nitrogen-fixing Eucalyptus globulus Labill. and nitrogen-fixing Cicer arietinum (chickpea) were selected for phytoremediation, while Eisenia foetida and Gus gallus were chosen as impacted receptors. Chickpea monoculture was least effective for soil remediation, and soil cadmium under this cultivation system had the most potential threats to the environment. The chickpea monoculture cultivation system needs 132 years to reduce the initial soil cadmium concentration to the quality guidelines of China. The environmental risk index of receptors was greater than in other cultivation systems. The greatest remediation effectiveness occurred in the E. globulus monoculture with earthworm addition. This approach decreases the decontamination time of cadmium in the soil by 80% compared to chickpea monoculture without earthworms. In addition to a favorable phytoremediation effect, this cultivation system was accompanied by a more acceptable environmental risk index value because E. globulus are evergreen trees, unpalatable by livestock, with less litterfall production than chickpeas. E. globulus monoculture with an earthworm addition system is especially suitable for remedying cadmium-polluted soil, as it causes the least environmental risk and reduces the time required to decontaminate the cadmium in the soil by 30% compared to the next most effective system. The decision of which cultivation system is more suitable for an anthropogenically influenced site should be balanced between the capacity of the plant to remove pollution and environmental preservation. Data from the present research have provided a new methodology of efficient phytoremediation with relatively low environmental risks. © 2016 Elsevier Ltd. Source

Luo J.,Wuhan University | Qi S.,Wuhan University | Peng L.,Guangdong Hydrogeology Battalion | Wang J.,Guangdong Hydrogeology Battalion
International Journal of Phytoremediation | Year: 2016

The capacity of plants to uptake heavy metals from contaminated soils has shown great phytoremediation potential. The development, resistibility and Cd extraction of Eucalyptus globulus individuals from metalliferous and clean sites in different years were analyzed under a specific environment. Eucalyptus globulus planted in Guiyu for phytoremediation or cultivated in an uncontaminated, natural environment for economic purposes were transplanted to Yuecheng town, which, in recent years, has been involved in the e-waste dismantling and recycling business, to compare the phytoremediation efficiency of Eucalyptus globulus trees grown in different environments. Trees cultivated in polluted areas can remove far more Cd and Hg from the contaminated soil than the individuals from clean soils because metalliferous Eucalyptus globulus can produce more biomass and uptake more heavy metals than nonmetalliferous plants per year. As polluted environments negatively affect the growth of plants, we speculated that the phytoremediation efficiency of metalliferous Eucalyptus globulus should decrease over time and that nonmetalliferous trees should adapt to the local environment. © 2016, © Taylor & Francis Group, LLC. Source

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