دانلود مقاله Removal of Cu2+ and Ni2+ from wastewater by reverse osmosis processes and chelating agent
سال انتشار: ۱۳۸۵
محل انتشار: اولین همایش تخصصی مهندسی محیط زیست
تعداد صفحات: ۸
Montazeri – Department of Chemistry, Kashan University, Kashan, Iran
Mohsen Nia – Thermodynamic Research Laboratory, Kashan University, Kashan, Iran
The performance of a thin film composite spiral wound type membrane in reverse osmosis process is studied for rejecting theandfrom single-salt and mixed-salt systems. The experimental results for the systems including sulfate salts, indicated thatremoved from the sample solutions was more than , however for both ions the salts concentration had a decreasing effect on ions removal. Also the ion rejection in the different operating pressure was calculated and reported. The obtained results indicated that the ion rejection depends on hydraulic and osmosis pressures, however, by considering the operation limitations the ion rejection factor is less than the unit. To examine the effect of size of the ions on the rejection by the membrane, the ionsandwere chelated by disoduim salt ethylene diamine tetraacetic acid (Na2EDTA) as a chelating agent. The obtained results indicate that Na2EDTA can increase the rejection efficiency of the membrane used in the process ofandremoval from industrial wastewater.