The levels of trace metals Co, Cu, Ni and Zn in both
dissolved and particulate phases of water from six branches
of Shatt Al-Arab River have been investigated during two
seasons, spring and summer 2006 by means of Atomic
Absorption Spectrophotometry. Levels recorded in μg/ml
were: Co (0.019-0.078), Cu(0.163 - 0.240), Ni(0.035 – 0.094)
and Zn (0.130–0.215) in dissolved phase during both seasons
compared to particulate phase in which levels recorded in
μg/g were Co (11.10 – 26.468), Cu(76.340- 376.543), Ni
(7.778 – 150.676) and Zn (222.546 – 654.128). These levels
were higher than most previous studies at the same sites. It is
appeared that all studied branches are highly polluted and
water appears highly turbid, viscose and greenish in color
due to the expected abundance of phytoplanktons.
Here is a study about reed bed treatments and metal removal. It has a number of useful references too
Article Reed beds: Constructed wetlands for municipal wastewater tre...
To know the best plant, you need to construct ponds of the same size and plant different types of reeds. You measure the concentration of the parameters in the effluent and by so doing you will be able to select the best. You try in one pond phragmites, another pond latifola and in another pond you can have the mixture of the two plants.
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