Membrane and Water Treatment

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Removal of sulfate ion from semiconductor wastewater by ettringite precipitation

  • Chung, Chong-Min (Department of Environment Science & Biotechnology, Jeonju University)
  • Received : 2022.05.16
  • Accepted : 2022.06.03
  • Published : 2022.07.25
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Abstract

This study seeks towards an optimal way to control sulfate ions in semiconductor wastewater effluent with potential eco-toxicity. We developed a system based on ettringite (Ca6Al2(SO4)3(OH)12·26H2O). The basic idea is that the pH of the water is raised to approximately 12 with Ca(OH)2. After, aluminium salt is added, leading to the precipitation of ettringite. Lab-scale batch and continuous experiment results with real semiconductor wastewater demonstrated that 1.5 and 1 of stoichiometric quantities for Ca2+ and A3+ with pH above 12.7 could be considered as the optimal operation condition with 15% of sludge recycle to the influent. A mixed AlCl3 + Fe reagent was selected as the beneficial Al3+ source in ettringite process, which resulted in 80% of sludge volume reduction and improved sludge dewaterability. The results of continuous experiment showed that with precipitation as ettringite, sulfate concentration can be stably reduced to less than 50 mg/L in effluent from the influent 2,050 ± 175 mg/L on average (1,705 ~ 2,633 mg/L).

Keywords

Acknowledgement

This work was supported by the Technological Innovation R&D Program [S3276954] funded by the Ministry of SMEs and Startups (MSS, Korea) and the Research Grant of Jeonju University in 2021.

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