Document Detail

A simple method for removing chelated copper from wastewaters: Ca(OH)(2)-based replacement-precipitation.
MedLine Citation:
PMID:  18653210     Owner:  NLM     Status:  MEDLINE    
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.
Shuxian Jiang; Fenglian Fu; Junxiong Qu; Ya Xiong
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-07-23
Journal Detail:
Title:  Chemosphere     Volume:  73     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2008 Oct 
Date Detail:
Created Date:  2008-09-15     Completed Date:  2008-12-22     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  785-90     Citation Subset:  IM    
School of Environmental Science and Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
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MeSH Terms
Calcium Hydroxide / chemistry*
Chelating Agents / chemistry*
Chemical Precipitation
Copper / isolation & purification*
Edetic Acid / chemistry*
Hydrogen-Ion Concentration
Waste Disposal, Fluid / methods
Water Pollutants, Chemical / isolation & purification*
Water Purification / methods*
Reg. No./Substance:
0/Chelating Agents; 0/Water Pollutants, Chemical; 1305-62-0/Calcium Hydroxide; 60-00-4/Edetic Acid; 7440-50-8/Copper

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