Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Effect of Calcium Ion and Initial pH on Phosphorus Removal using TiCl4 Coagulant

칼슘이온과 초기 pH가 TiCl4 응집제의 인 제거에 미치는 영향

  • Kang, Seong Hyeon (Department of Environmental Engineering, Kangwon National University) ;
  • Kang, Jang Hyeon (Department of Environmental Engineering, Kangwon National University) ;
  • Kim, Han Gyul (Department of Environmental Engineering, Kangwon National University) ;
  • Jeong, Hee Hoon (Department of Environmental Engineering, Kangwon National University) ;
  • Kim, Jong Ho (Department of Chemical Engineering, Chonnam National University) ;
  • Ahn, Johng-Hwa (Department of Environmental Engineering, Kangwon National University)
  • 강성현 (강원대학교 환경공학과) ;
  • 강장현 (강원대학교 환경공학과) ;
  • 김한결 (강원대학교 환경공학과) ;
  • 정희훈 (강원대학교 환경공학과) ;
  • 김종호 (전남대학교 응용화학공학부) ;
  • 안종화 (강원대학교 환경공학과)
  • Received : 2016.11.30
  • Accepted : 2017.03.06
  • Published : 2017.03.31
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Abstract

This study experimentally determined the effect of calcium ion ($Ca^{2+}$) (0-0.55 mM) and intial pH (4.0-10.0) on phosphorus (P) removal in synthetic wastewater (2 mg P/L) using titanium tetrachloride ($TiCl_4$) (0.12-0.18 mM). At TiCl4 concentration ([$TiCl_4$]) = 0.12 mM, the P removal efficiency was the highest (95.1%) at pH 7 but the efficiency decreased to 51.4% at pH 8. The P removal efficiency was 55.6% at $Ca^{2+}$ concentration ([$Ca^{2+}$]) = 0 mM but the efficiency increased to 90.5% at [$Ca^{2+}$] = 0.045 mM at [$TiCl_4$] = 0.12 mM. On the other hand, the P removal efficiency difference was not large (96.5-99.5%) with [$Ca^{2+}$] at [$TiCl_4$] = 0.15-0.18 mM. Within the design boundaries of $0.00{\leq}[Ca^{2+}]{\leq}0.18mM$ and $7.0{\leq}initial$ $pH{\leq}9.0$ at [$TiCl_4$] = 0.12 mM, the 90% P removal efficiency could be achieved at $[Ca2+]{\geq}0.10mM$ with pH 8.0 and $[Ca2+]{\geq}0.12mM$ with pH 9.0.

본 연구에서는 $TiCl_4$ (0.12-0.18 mM)를 이용하여 합성 폐수(2 mg P/L)내 인을 제거할 때, 칼슘이온($Ca^{2+}$) (0-0.55 mM)이 인 제거에 미치는 영향을 알아보았다. $TiCl_4$ 0.12 mM일 때 초기 pH(4.0-10.0)에 따른 실험결과 pH 7에서 인 제거율이 95.1%로 가장 높았고, pH 8에서 인 제거율이 51.4%로 떨어졌다. $TiCl_4$ 0.12 mM에서 $Ca^{2+}$농도 0 mM일 때 인 제거율은 55.6%, $Ca^{2+}$농도 0.045 mM에서는 90.5%로 증가하였다. 반면에 $TiCl_4$ 0.15-0.18 mM에서는 $Ca^{2+}$농도에 따른 인 제거율(96.5-99.5%)의 차이는 미미하였다. $TiCl_4$ 농도를 0.12 mM로 고정하고, 초기 pH 7.0-9.0, $Ca^{2+}$ 농도 0.00-0.18 mM 범위에서 반응표면분석법을 이용하여 분석한 결과, 실험 범위내에서 인 제거율 90%이상을 얻기 위해서는 $Ca^{2+}$ 농도는 pH 8.0에서 0.10 mM, pH 9.0에서 0.12 mM 이상이 필요하다.

Keywords

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