Evaluation of forward osmosis efficiency in removal of heavy metals chromium and lead from aqueous

Naghdali, Zohreh and jamali, hamze ali (2019) Evaluation of forward osmosis efficiency in removal of heavy metals chromium and lead from aqueous. Masters thesis, Qazvin University Of Medical Sciences,Qazvin,Iran.

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Background and aim: Considering the carcinogenic effects of heavy metals, such as chromium and lead, it is essential to remove these elements from water and wastewater. Forward osmosis is a new membrane technology, which can be a proper alternative to conventional chromium and lead removal processes. Material and Methods: The wastewater samples were obtained from K2Cr2O7 and Pb(NO3) as feed solutions. KCl, CaCl2 and MgCl2 was used as the draw solutions, and the applied membrane (Aquaporin) was semipermeable. The experiments were designed, using response surface methodology (RSM) and central composite design (CCD). The metals concentration and water flux were also measured, based on atomic absorption spectrophotometry and water flux equations, respectively. Results: The results showed that forward osmosis was highly efficient in chromium and lead removal and water flux. The highest chromium and lead removal efficiency were 99.91% and 99.43%, respectively. The highest water flux and lowest RSF were 19.44 LMH and 0.1 gMH, respectively under optimal conditions. In this conditions the desirability was best (95%) for Cr-CaCl2 experiment. The model in all experiments was significant (P< 0.0001).In terms of validity, the results predicted by the quadratic polynomial model were in good agreement with the responses reported in the laboratory. Conclusion: Forward osmosis resulted in acceptable chromium and lead removal from aqueous solutions. These results revealed the FO process applying an AQP besides the RSM-CCD can be observed to treat wastewaters containing heavy metals. Beyond that, further study will be performed for the removal of most hazardous heavy metals in wastewater to explore the feasibility of practical applications.

Item Type: Thesis (Masters)
Subjects: T Technology > TD Environmental technology. Sanitary engineering
Divisions: University Thesis > Faculty of Health > Environmental Health
Depositing User: Health School Students
Date Deposited: 21 Sep 2019 07:14
Last Modified: 21 Sep 2019 07:14
URI: http://eprints.qums.ac.ir/id/eprint/8965

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