Removal of dissolved Zn(II) using coal mine drainage sludge: Implications for acidic wastewater treatment

Mingcan Cui, Min Jang, Fred Scott Cannon, Seunmin Na, Jeehyeong Khim, Jae Kwang Park

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The mechanism for the removal of Zn(II) by using coal mine drainage sludge (CMDS) was investigated by spectroscopic analysis and observations of batch tests using model materials. Zeta potential analysis showed that CMDS 25 (dried at 25 °C) and CMDS 550 (dried at 550 °C) had a much lower isoelectric point of pH (pH IEP ) than either goethite or calcite, which are the main constituents of CMDS. This indicates that the negatively charged anion (sulfate) was incorporated into the structural networks and adsorbed on the surface of CMDS via outer-sphere complexation. The removal of Zn(II) by CMDS was thought to be primarily caused by sulfate-complexed iron (oxy)hydroxide and calcite. In particular, the electrostatic attraction of the negatively charged functional group, FeOH-SO 4 2- , to the dissolved Zn(II) could provide high removal efficiencies over a wide pH range. Thermodynamic modeling and Fourier transform infrared spectroscopy (FT-IR) demonstrated that ZnSO 4 is the dominant species in the pH range 3-7 as the sulfate complexes with the hydroxyl groups, whereas the precipitation of Zn(II) as ZnCO 3 or Zn 5 (CO 3 ) 2 (OH) 6 through the dissolution of calcite is the dominant mechanism in the pH range 7-9.6.

Original languageEnglish (US)
Pages (from-to)107-112
Number of pages6
JournalJournal of Environmental Management
Volume116
DOIs
StatePublished - Feb 5 2013

Fingerprint

mine drainage
Coal mines
Wastewater treatment
coal mine
Drainage
sludge
Calcite
calcite
sulfate
Spectroscopic analysis
Zeta potential
Complexation
goethite
FTIR spectroscopy
complexation
model test
Functional groups
functional group
Fourier transform infrared spectroscopy
hydroxide

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law

Cite this

Cui, Mingcan ; Jang, Min ; Cannon, Fred Scott ; Na, Seunmin ; Khim, Jeehyeong ; Park, Jae Kwang. / Removal of dissolved Zn(II) using coal mine drainage sludge : Implications for acidic wastewater treatment. In: Journal of Environmental Management. 2013 ; Vol. 116. pp. 107-112.
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Removal of dissolved Zn(II) using coal mine drainage sludge : Implications for acidic wastewater treatment. / Cui, Mingcan; Jang, Min; Cannon, Fred Scott; Na, Seunmin; Khim, Jeehyeong; Park, Jae Kwang.

In: Journal of Environmental Management, Vol. 116, 05.02.2013, p. 107-112.

Research output: Contribution to journalArticle

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