Simultaneous reduction of copper and toxicity in semiconductor wastewater using protonated alginate beads

Sunghwan Bang, Jae Woo Choi, Kangwoo Cho, Chongmin Chung, Hojeong Kang, Seok Won Hong

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Using protonated alginate (HA) beads, copper (Cu2+) levels and toxicity were concurrently reduced in semiconductor wastewater produced from the chemical mechanical planarization process. The beneficial effect of protonation could be explained by a reduction in the release of Ca2+, which is a competitive cation during sorption of Cu2+, leading to an increased in the sorption capacity from 107 to 189 mg/g. Monitoring of the acute toxicity of two different types of semiconductor wastewater toward Daphnia magna suggested that Cu2+ was the cause of toxicity. The toxicity identification evaluation using D. magna indicated that Cu2+ was a major toxicant in the raw wastewater with concentrations of 1.97 and 3.37 mg/L for two different raw wastewater samples with initial toxicities of 14.2 and 23.6 toxic unit (TU), respectively. This relationship was verified by the correlation coefficients between Cu2+ concentration and acute toxicity (r2 = 0.829 at P < 0.05 and 0.894 at P < 0.05 for two types of semiconductor wastewater) in mass balance tests. The laboratory continuous column test using HA beads showed that the Cu2+ concentration in effluent was proportional to the acute toxicity. In particular, the TU values increased sharply when the residual concentration of Cu2+ exceeded 0.1 mg/L. The test battery results indicated that D. magna was more sensitive than other aquatic species, i.e., algae and bacteria, to Cu2+ in semiconductor wastewater.

Original languageEnglish
Pages (from-to)525-531
Number of pages7
JournalChemical Engineering Journal
Volume288
DOIs
Publication statusPublished - 2016 Mar 15

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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