| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程研究所 === 81 === The purpose of this research is to study the effect of
chelating agents, such as EDTA, NTA and citrate, on the
removal of copper from synthetic wastewaters by reverse
osmosis treatment. Experimental results are presented for the
removals of both copper ion and chelating agents. The
revelant parameters, such as permeate flux, transport
parameter, rejection, etc. under various operating conditions
were studied and discussed. Experimental indicate that the
presence of chelating agents severely inhibit the removal of
copper by reverse osmosis for neutral and basic solutions
where the formation of copper chelates predominates. The
copper ion and chelating agent exhibit somewhat different
separation properties by reverse osmosis for acidic solutions ,
for instance,the removals of chelating agent were found to be
lower than that of copper ion.The removals of copper
decrease with decreasing pH value in the range of pH for 2.0
to 5.0 but the effect of solution pH on the removal of EDTA
was not significant in the experimental pH range. The
increasing operation pressure made the removal efficiecies of
solute worese, which had different effect on each solution
system. The solution-diffusion model and Langmuir adsorption
model were both explained well in the transport behavior of
species through the membrane. The technical feasibility of
reverse osmosis treatment of chelated heavy metal from
wastewaters were evaluated with an understanding of metal
coordination concepts.
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