Removal of heavy metals from aqueous solution biosorption
Dissertant
University
University of Technology
Faculty
-
Department
Department of Chemical Engineering
University Country
Iraq
Degree
Ph.D.
Degree Date
2008
English Abstract
The discharge of heavy metals into aquatic ecosystems has become one of the most serious environment problems.
Heavy metals are introduced to ecosystem as results of several industries (electroplating, petroleum industries).
Biosorption, use of biomaterials, such as bacteria, fungi, yeast, and algae, is regarded as a cost effective biotechnology for the treatment of high volume wastewaters and low concentration of heavy metals.
The present study evaluates the potential of the yeast Saccharomyces Cerevisiae to remove lead, cadmium, chrome, copper, cobalt, and zinc from aqueous solutions.
The effect of pH, temperature, initial concentration, contact time, and bicsorbent dosage on biosorption capacity is studied in batch experiments, the el feet of pretreated and immobilized yeast is also studied.
Experiment results show that metal uptake is a rapid process at pH values (5.0-6.0), the order of accumulated metal ions is Pb > Zn > Cr > Co > Cd > Cu.
Pretreatment using NaOH and Na2CO2 enhances biosorption capacity of the yeast.
Batch and column studies show that immobilized yeast is able to remove metal ions.
Sorption isotherms are studied to explain the removal mechanisms of metal ions by tilting isotherm data into Langmuir and Freundlich equations, the biosorption of lead, cadmium, chrome, copper, cobalt, and zinc from aqueous solutions on live yeast at an initial pH of (5.0-6.0) could be described by both the Freundlich and the Langmuir adsorption isotherms.
The kinetics of metal ions biosorption could be described by Lagergren and Ho models.
Nitric acid with low concentration of 0.05 N is effective in desorbing the biosorbed metal ions.
Sodium hydroxide solution of 0,2 M is
Main Subjects
Topics
American Psychological Association (APA)
al-Ubaydi, Salah Nuri Farhan. (2008). Removal of heavy metals from aqueous solution biosorption. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-304988
Modern Language Association (MLA)
al-Ubaydi, Salah Nuri Farhan. Removal of heavy metals from aqueous solution biosorption. (Doctoral dissertations Theses and Dissertations Master). University of Technology. (2008).
https://search.emarefa.net/detail/BIM-304988
American Medical Association (AMA)
al-Ubaydi, Salah Nuri Farhan. (2008). Removal of heavy metals from aqueous solution biosorption. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-304988
Language
English
Data Type
Arab Theses
Record ID
BIM-304988
