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Treatment of a synthetic solution of galvanization effluent via the conversion of sodium cyanide into an insoluble safe complex.
J Hazard Mater. 2009 Jul 30; 166(2-3):978-83.JH

Abstract

Wastewater discharged from metal-finishing processes usually contains cyanide, a hazardous substance that is used extensively in the surface finishing industry. In the present study, a synthetic solution resembling the contaminated wastewater was chemically treated using ferrous sulfate. This simple one-step process was applied successfully to remove cyanide from metal finishing wastewater. The experiments were carried out on a synthetic solution containing ions of cyanide and zinc. The effects of mixing velocity, ratio of ferrous ions to cyanide ions, ferrous ions concentration, initial cyanide concentration, pH of solution, temperature, mixing time and zinc ions concentration were studied. The results showed that the removal efficiency of cyanide increased as the mixing velocity increased, ferrous ion molar ratio to cyanide ions increased, temperature increased and time of mixing increased at an optimum of pH 8. The reduction of cyanide concentration reached the allowable limit for wastewater discharge according to the Egyptian Environmental Law decree 44/2000, which is 0.2mg/l. The formed complexes were analyzed and the stability of each complex was studied under different pH value solutions after 7 days of contact. A typical example of electroplating wastewater from a local company in the field of metal finishing, which contains 18 mg/lCN(-) and 12 mg/l Zn(2+), was treated according to the determined optimum conditions for the treatment process and the concentration of CN(-) was reduced to 0.095 mg/l after 15 min of agitation.

Authors+Show Affiliations

Department of Chemical Engineering, Cairo University, Giza, Egypt. dr_ismail@instruchem.orgNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

19135781

Citation

Ismail, Ibrahim, et al. "Treatment of a Synthetic Solution of Galvanization Effluent Via the Conversion of Sodium Cyanide Into an Insoluble Safe Complex." Journal of Hazardous Materials, vol. 166, no. 2-3, 2009, pp. 978-83.
Ismail I, Abdel-Monem N, Fateen SE, et al. Treatment of a synthetic solution of galvanization effluent via the conversion of sodium cyanide into an insoluble safe complex. J Hazard Mater. 2009;166(2-3):978-83.
Ismail, I., Abdel-Monem, N., Fateen, S. E., & Abdelazeem, W. (2009). Treatment of a synthetic solution of galvanization effluent via the conversion of sodium cyanide into an insoluble safe complex. Journal of Hazardous Materials, 166(2-3), 978-83. https://doi.org/10.1016/j.jhazmat.2008.12.005
Ismail I, et al. Treatment of a Synthetic Solution of Galvanization Effluent Via the Conversion of Sodium Cyanide Into an Insoluble Safe Complex. J Hazard Mater. 2009 Jul 30;166(2-3):978-83. PubMed PMID: 19135781.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Treatment of a synthetic solution of galvanization effluent via the conversion of sodium cyanide into an insoluble safe complex. AU - Ismail,Ibrahim, AU - Abdel-Monem,Nabil, AU - Fateen,Seif-Eddeen, AU - Abdelazeem,Waleed, Y1 - 2008/12/06/ PY - 2008/07/08/received PY - 2008/11/26/revised PY - 2008/12/01/accepted PY - 2009/1/13/entrez PY - 2009/1/13/pubmed PY - 2009/8/6/medline SP - 978 EP - 83 JF - Journal of hazardous materials JO - J Hazard Mater VL - 166 IS - 2-3 N2 - Wastewater discharged from metal-finishing processes usually contains cyanide, a hazardous substance that is used extensively in the surface finishing industry. In the present study, a synthetic solution resembling the contaminated wastewater was chemically treated using ferrous sulfate. This simple one-step process was applied successfully to remove cyanide from metal finishing wastewater. The experiments were carried out on a synthetic solution containing ions of cyanide and zinc. The effects of mixing velocity, ratio of ferrous ions to cyanide ions, ferrous ions concentration, initial cyanide concentration, pH of solution, temperature, mixing time and zinc ions concentration were studied. The results showed that the removal efficiency of cyanide increased as the mixing velocity increased, ferrous ion molar ratio to cyanide ions increased, temperature increased and time of mixing increased at an optimum of pH 8. The reduction of cyanide concentration reached the allowable limit for wastewater discharge according to the Egyptian Environmental Law decree 44/2000, which is 0.2mg/l. The formed complexes were analyzed and the stability of each complex was studied under different pH value solutions after 7 days of contact. A typical example of electroplating wastewater from a local company in the field of metal finishing, which contains 18 mg/lCN(-) and 12 mg/l Zn(2+), was treated according to the determined optimum conditions for the treatment process and the concentration of CN(-) was reduced to 0.095 mg/l after 15 min of agitation. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/19135781/Treatment_of_a_synthetic_solution_of_galvanization_effluent_via_the_conversion_of_sodium_cyanide_into_an_insoluble_safe_complex_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(08)01810-4 DB - PRIME DP - Unbound Medicine ER -