21.  Studies Regarding the Copper Ions Removal from Waste Waters

Authors: A. Negrea, M. Ciopec, L. Lupa, C. Muntean, P. Negrea


Abstract:

Waste waters resulted from industry usually contain heavy metals salts. During the neutralization process with sodium hydroxide and sodium carbonate these salts are transformed in compounds such as insoluble hydroxides or basic salts. The precipitation process represents one of the most used methods for the removal of heavy metals from waste waters. In the present paper are presented studies on the removal of copper ions from waste waters resulted from industry through precipitation, using 15% NaOH and 20% Na2CO3 solutions as precipitation agents. The studies were carried out on synthetic solutions containing copper in various concentrations (5, 10 and 15 g Cu2+/L). Several aspects of the precipitation process were studied: the dependence of the pH of the reaction mass on the volume of precipitation agent, the evolution of the volume of suspensions in time and the dependence on the pH of the residual concentration of copper ions. The optimum pH value for the removal of cooper ions from the waste waters for both precipitation agents is 7. For all initial copper ions concentrations, pH = 7 assures residual concentrations smaller than the maximum value admitted by the legislation. The copper ions removal using the 20% Na2CO3 solutions was also studied on a pilot installation. Copper residual concentration decreased with installation functioning time; the installation went into constant conditions after ~300 minutes; a constant residual concentration of ~1.1 mg Cu2+/L was reached.


Keywords: waste water, copper removal, precipitation method

PDF Version

 
 
Issues

Articles in Press
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2016
Volume 61(75), Issue 2, 2016
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2016
Volume 61(75), Issue 1, 2016
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2015
Volume 60(74), Issue 2, 2015
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2015
Volume 60(74), Issue 1, 2015
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2014
Volume 59(73), Issue 2, 2014
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2014
Volume 59(73), Issue 1, 2014
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2013
Volume 58(72), Issue 2, 2013
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2013
Volume 58(72), Issue 1, 2013
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2012
Volume 57(71), Issue 2, 2012
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2012
Volume 57(71), Issue 1, 2012
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2011
Volume 56(70), Issue 2, 2011
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2011
Volume 56(70), Issue 1, 2011
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2010
Volume 55(69), Issue 2, 2010
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2010
Volume 55(69), Issue 1, 2010
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2009
Volume 54(68), Issue 2, 2009
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2009
Volume 54(68), Issue 1, 2009
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2008
Volume 53(67), Issue 1 - 2, 2008
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2007
Volume 52(66), Issue 1 - 2, 2007
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2006
Volume 51(65), Item 1 - 2, 2006
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)


2005
Volume 50(64), Item 1 - 2, 2005
Chem. Bull. `POLITEHNICA` Univ. (Timisoara)



   
 
 
  © 2018 Industrial Chemistry and Environmental Engineering Faculty