Application of Phytoremediation Technology to Typical Mining Sites in China
In situ phytoextraction projects using Pteris vittata have been established with high removal rates of As. The first phytoextraction project in the world was established in Chenzhou of Hunan Province. Afterwards, more phytoextraction projects were establi
- PDF / 1,241,837 Bytes
- 19 Pages / 439.37 x 666.142 pts Page_size
- 71 Downloads / 193 Views
Application of Phytoremediation Technology to Typical Mining Sites in China
Abstract In situ phytoextraction projects using Pteris vittata have been established with high removal rates of As. The first phytoextraction project in the world was established in Chenzhou of Hunan Province. Afterwards, more phytoextraction projects were established in Guangxi Zhuang Autonomous Region, Yunnan Province, and Henan Province. Through the phytoremediation practices, phytoremediation is confirmed to be an economical, easy and green technology, which well fit for the current farmland contamination status. Besides, the strengthening measures have expanded the application range of phytoextraction from south China to North China. And the utilization of this technology is not limited to farmland but also works for the brown sites. However, there are still a lot of questions waiting for further study. These questions proposed new demands for the science and technology development of phytoremediation technology. Keywords Agricultural land · Application · Field · Mining site
4.1 In Situ Phytoremediation Projects by P. vittata In situ phytoremediation projects using P. vittata have been established on both farmlands in China and residential areas in America, with high As removal rates achieved (Chen et al. 2007; Ebbs et al. 2010). The first phytoextraction project in the world was established in Chenzhou, Hunan Province. After the cultivation of P. vittata for seven months, As concentration in the soil decreased by 5.0 mg kg−1 , with remediation efficiency reaching 7.84% (Liao et al. 2004). Afterwards more phytoextraction projects were established in the Guangxi Zhuang Autonomous Region, Yunnan Province, Henan Province, Guangdong Province, and Hebei Province (Chen et al. 2018a, b). In these projects, the main targeted contaminant is As, accompanied by cadmium (Cd) and lead (Pb) under most conditions. Table 4.1 summarizes the representative phytoremediation projects of arsenic contaminated soil in China. The main technologies are phytoextraction and intercrop. The As removal rate reached ~18%.
© The Author(s) 2020 T. Chen et al., Phytoremediation of Arsenic Contaminated Sites in China, SpringerBriefs in Environmental Science, https://doi.org/10.1007/978-981-15-7820-5_4
51
52
4 Application of Phytoremediation Technology to Typical Mining …
Table 4.1 Phytoremediation projects of arsenic contaminated soil in China Place
Contaminant
Technology
Remediation efficiency
Chenzhou, Hunan Province
As
Phytoextraction
Through 3–5 year remediation, soil As content decreased from 50 mg kg−1 to Pb > Cd > Zn > Cu. The spatial distribution of As, Pb, Zn, Cu, Ni and Fe was very similar, indicating their same pollution source. Phytoextraction using hyperaccumulator P. vittata was conducted there (Fig. 4.5). The Pb concentration in P. vittata reached 1303 mg kg−1 in fronds, meeting the requirement of Pb hyperaccumulator. P. vittata can remove 15.5 kg ha−1 As and 8.5 kg ha−1 Pb from soil per year (2 harvests). When the concentrations of As and
Data Loading...
