Removal of heavy metals from aqueous solution biosorption

مقدم أطروحة جامعية

al-Ubaydi, Salah Nuri Farhan

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم الهندسة الكيمياوية

دولة الجامعة

العراق

الدرجة العلمية

دكتوراه

تاريخ الدرجة العلمية

2008

الملخص الإنجليزي

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

التخصصات الرئيسية

الكيمياء

الموضوعات

• الصرف الصحي
• مياه الصرف الصحي
• المعادن الثقيلة
• الجوانب البيئية

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-304988