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Title: Response of selected aquatic macrophytes towards textile dye wastewaters
Authors: Sharma, K P
Sharma, Kamayani
Kumar, Suresh
Sharma, Shweta
Grover, Ruby
Soni, Pratima
Bhardwaj, S M
Chaturvedi, R K
Sharma, Subhasini
Keywords: dye wastewaters
emergent macrophytes
free floating macrophytes
submerged macrophytes
Issue Date: Oct-2005
Publisher: CSIR
IPC CodeInt.Cl.7 C02F3/32; 103:30
Abstract: Ten aquatic macrophytes, Ceratophyllum demersum, Hydrilla verticillata (submerged), Azolla pinnata, Eichhornia crassipes, Lemna aequinoctialis, Spirodela polyrhiza (free-floating), Cyperus alopecuroides, Phragmites karka, Polygonum barbatum and Typha angustata (emergent) were screened for tolerance towards textile dye wastewaters, released during processing (dye fixing and washing) of printed cloth, to raise constructed wetlands for their phytoremediation. The concentrated dye wastewaters of first wash were found toxic to plant growth. The free-floating plant species were almost dead in dilute acidic-azo water (pH 4.3-6.2), while their growth was adversely affected in neutral-azo (pH 7) and silicate waters (pH 9-10). Amongst emergent macrophytes; Polygonum died in acidic-azo and silicate waters, while its growth in neutral-azo was adversely affected. Cyperus too did not grow well in dye wastewaters, especially the acidic-azo water, whereas growth of Typha in wastewaters was similar to control plants. Phragmites was the only plant species growing better than the control plants in dye wastewaters, both in laboratory and field studies. Lemna and Spirodela are recommended for assessing the toxicity of textile dye wastewaters, and Phragmites for raising constructed wetlands to treat the same.
Page(s): 538-545
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Source:IJBT Vol.04(4) [October 2005]

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