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Phytocapping : an alternative technique for landfill remediation

journal contribution
posted on 06.12.2017, 00:00 by Nanjappa AshwathNanjappa Ashwath, Kartik VenkatramanKartik Venkatraman
An alternative technique of landfill remediation known as 'Phytocapping' was trialled at Rockhampton, Australia. Twenty one tree species were established on two types of phytocaps (thick cap; 1400 mm soil and thin cap; 700 mm). The trial was monitored for plant growth, transpiration loss, canopy rainfall interception and methane oxidation. The results show that the tree species can intercept ca. 30% of the rainfall and they transpire 1-2 mm day−1. The phytocaps also lowered methane emission by 4-5 times compared to an adjacent non-vegetated landfill. The HYDRUS 1D simulation revealed a percolation rate of 16.7 mm yr−1 in thick phytocap and 23.8 mm yr−1 in thin phytocap. These values are significantly lower than those expected from compacted clay capping (78 mm yr−1; i.e. 10% of the rainfall). Overall, this study demonstrated that the phytocaps are effective in minimising percolation of water into buried waste. Further research is being conducted (http://www.wmaa.com.au/aacap/aacap.html), to seek approval of regulatory authorities to use phytocapping as an alternative technique of landfill remediation.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

6

Issue

1-2

Start Page

51

End Page

70

Number of Pages

20

ISSN

1478-9876

Location

UK

Publisher

Inderscience Publishers

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Centre for Plant and Water Science; Institute for Resource Industries and Sustainability (IRIS);

Era Eligible

Yes

Journal

International journal of environment and waste management.