The removal of copper in water using manganese activated saturated and unsaturated sand filters

Chedly Tizaoui, Sugihhartati Dj Rachmawati, Nidal Hilal

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Activated unsaturated sand filter (AUSF) is one among the few of the filtration technologies utilised to treat metal bearing waters. AUSF utilises activated sand as its filter media and operates under naturally flowing air to ensure unsaturated condition. In this study, manganese-activated sand was used for the removal of copper. Activation of the sand increased its BET surface area by 21% at 0.071. mg Mn/g sand and Mn leaching was significant only at pH < 4.5. SEM/EDS showed clusters of crystalline manganese oxides coating the sand surface and newborn copper hydroxides occupying sand surface after exposure to copper-bearing-water. A tracer study revealed that the gas voidage in the filter increased from 0.143 to 0.294 as the water flow rate reduced from 74.4 to 16.4. mL/min, which ensured better water aeration and increased copper removal. The ratio of manganese to sand was a key parameter as it increased almost exponentially the removal capacity of the AUSF. On the other hand, copper removal increased linearly with the inverse of the sand particle size, which indicates the importance of the surface area in the process. However, unexpectedly, when the inlet copper concentration increased from 3 to 20. mg/L, the filter capacity reduced by about 50% from 0.020 to 0.011. mg Cu/g sand. Based on the results obtained, mechanisms by which copper was removed in AUSF were proposed and they were found to vary as function of time [electrostatic attraction (t< 2. min); precipitation (t< 3.8. min), and adsorption/ion exchange (t< 60. min)].

Original languageEnglish
Pages (from-to)334-344
Number of pages11
JournalChemical Engineering Journal
Volume209
DOIs
Publication statusPublished - 5 Oct 2012
Externally publishedYes

Fingerprint

Manganese
Copper
manganese
Sand
copper
filter
sand
Water
water
Bearings (structural)
removal
surface area
Water aeration
Manganese oxide
manganese oxide
Leaching
hydroxide
Energy dispersive spectroscopy
Electrostatics
water flow

Keywords

  • Activated unsaturated sand filter
  • Adsorption
  • Copper removal
  • Electrostatic attraction
  • Manganese
  • Precipitation

ASJC Scopus subject areas

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

Cite this

The removal of copper in water using manganese activated saturated and unsaturated sand filters. / Tizaoui, Chedly; Rachmawati, Sugihhartati Dj; Hilal, Nidal.

In: Chemical Engineering Journal, Vol. 209, 05.10.2012, p. 334-344.

Research output: Contribution to journalArticle

Tizaoui, Chedly ; Rachmawati, Sugihhartati Dj ; Hilal, Nidal. / The removal of copper in water using manganese activated saturated and unsaturated sand filters. In: Chemical Engineering Journal. 2012 ; Vol. 209. pp. 334-344.
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