A Case Study for Removing Highly Concentrated Chlorides from Industrial Wastewater

Document Type : Original Article

Authors

Chemical Engineering and Pilot Plant Department, National Research Centre, Cairo, Egypt El-Bohouth Street, Dokki; P.O. Box 12622 Phone: +201111227080, Fax: +20-2-3370931

Abstract

Removal of chloride ions is necessary to improve water quality before being reused for irrigation of non-edible trees. The objective of this study is to remove chloride ions from acidic industrial wastewater using ultra high lime aluminate (UHLA) process. Treated wastewater was generated from National Egyptian Renewable Chinese Laboratory for solar energy plate’s manufacture. A set of experiments have been conducted to predict the optimum operating conditions for optimization the chlorides removal.

In experiments, alum (aluminum sulfate) and/or CaO (lime) was added to adjust wastewater pH. The reagent dosages, lime and alum doses, reaction times, pH levels, and starting chloride concentrations in the removal of chloride ions have been examined. According to experimental findings, complex precipitation of calcium aluminate chloride hydroxide Ca4 Al2Cl2 (OH)12 was responsible for controlling the removal of chloride ions, and highest removal has been achieved at doses of lime to alum that ends to an acceptable limit. In this investigation, about 84% was the highest removal of chloride ions occurred at a dosage of 2.9 molar lime/alum at a high pH (10.5). Therefore, it was discovered that elimination depends on both aluminum content and an alkaline pH.

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History

  • Receive Date: 29 March 2023
  • Revise Date: 14 June 2023
  • Accept Date: 25 June 2023

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