Academic Journal
Chromium removal and water recycling from electroplating wastewater through direct osmosis: Modeling and optimization by response surface methodology
| العنوان: | Chromium removal and water recycling from electroplating wastewater through direct osmosis: Modeling and optimization by response surface methodology |
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| المؤلفون: | Naghdali, Zohreh, Sahebi, Soleyman, Ghanbari, Reza, Mousazadeh, Milad, Jamali, Hamzeh Ali |
| المصدر: | Environmental Health Engineering and Management ; volume 6, issue 2, page 113-120 ; ISSN 2423-3765 2423-4311 |
| بيانات النشر: | Maad Rayan Publishing Company |
| سنة النشر: | 2019 |
| الوصف: | Background: Considering the carcinogenic effects of heavy metals, such as chromium, it is essential to remove these elements from water and wastewater. Direct osmosis is a new membrane technology, which can be a proper alternative to conventional chromium removal processes. Methods: The wastewater samples were collected from an electroplating unit, located in Alborz industrial city, Qazvin, Iran. Magnesium chloride was used as the draw solution, and a semipermeable membrane (Aquaporin) was used in this study. The experiments were designed, using response surface methodology (RSM) and central composite design (CCD) with draw solution concentration (0.5- 1.5 M), feed solution concentration (4-12 mg/L), and experiment time (30-90 minutes) as variable factors. The chromium concentration and water flux were also measured, based on atomic absorption spectrophotometry and water flux equation, respectively. Results: Direct osmosis was highly efficient in chromium removal and water recycling. Water flux and chromium removal efficiency were 15.6 LMH and 85.58%, respectively, under optimal conditions (draw solution = 1.27 mol/L, feed solution = 4 mg/L, and experiment time = 90 min). In terms of validity, the results predicted by the quadratic polynomial model were in good agreement with the responses reported in the laboratory. Conclusion: In direct osmosis, the use of magnesium chloride as the draw solution resulted in the acceptable chromium removal from electroplating wastewater. Using this method, chromium concentration in wastewater reduced to a level lower than the discharge standards, established by Iran’s Department of Environment. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.15171/ehem.2019.13 |
| الاتاحة: | http://dx.doi.org/10.15171/ehem.2019.13 http://ehemj.com/article-1-496-en.pdf |
| رقم الانضمام: | edsbas.6388A5AC |
| قاعدة البيانات: | BASE |
| DOI: | 10.15171/ehem.2019.13 |
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