Chromium removal and water recycling from electroplating wastewater through direct osmosis: Modeling and optimization by response surface methodology

Journal Title: Environmental Health Engineering and Management Journal - Year 2019, Vol 6, Issue 2

Abstract

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.

Authors and Affiliations

Zohreh Naghdali1,2 , Soleyman Sahebi3 , Reza Ghanbari4,2 , Milad Mousazadeh1,2 , Hamzeh Ali Jamali4,2* 1Student

Keywords

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  • EP ID EP45472
  • DOI 10.15171/EHEM.2019.13
  • Views 335
  • Downloads 0

How To Cite

Zohreh Naghdali1, 2, Soleyman Sahebi3, Reza Ghanbari4, 2, Milad Mousazadeh1, 2, Hamzeh Ali Jamali4, 2* 1Student (2019). Chromium removal and water recycling from electroplating wastewater through direct osmosis: Modeling and optimization by response surface methodology. Environmental Health Engineering and Management Journal, 6(2), -. https://europub.co.uk/articles/-A-45472