Abstract：
:A simple Ca(OH)(2)-based replacement-precipitation process was applied to the removal of EDTA-chelated copper from wastewaters. The effect of initial pH of the solution, molar ratio of Ca(2+) to Cu(II), the presence of CO(2) on the removal efficiency was investigated. The experimental results showed that the Ca(OH)(2)-based replacement-precipitation process could efficiently remove the chelated copper from wastewaters. When 12 < or = pH < or = 13 and molar ratio of Ca(2+) to > or = Cu(II)2, the removal efficiency could reach 99% above, also being close to the theoretically simulated results. The presence of CO(2) in the air would exert negative effect on the removal efficiency, but the side effect could be effectively eliminated by the addition of flocculation agent polyacrylamide. Compared with Fe(2+)-based replacement-precipitation technique applied in industrial practice, the method possesses the advantages of less sludge, lower cost, higher removal efficiency and higher controllability.
journal_name
Chemospherejournal_title
Chemosphereauthors
Jiang S,Fu F,Qu J,Xiong Ydoi
10.1016/j.chemosphere.2008.06.010subject
Has Abstractpub_date
2008-10-01 00:00:00pages
785-90issue
5eissn
0045-6535issn
1879-1298pii
S0045-6535(08)00762-5journal_volume
73pub_type
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