Cross-border network for knowledge transfer and innovative development in wastewater treatment WATERFRIEND HUSRB/1203/221/196 1st HUSRB Students Meeting

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Cross-border network for knowledge transfer and
innovative development in wastewater
treatmentWATERFRIENDHUSRB/1203/221/1961st
HUSRB Students Meeting
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Inffluence of pH value on adsorption efficiency
of heavy metals from water Mina Jandric
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Introduction
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• Rapidly progress of industry increased
  environmental pollution
• Heavy metals in water and wasterwater-big
  concern and danger for living world

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Characteristics of heavy metals
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• Most common heavy metals in water Zn, Cu, Hg,
  Ni, Cd, Pb, Cr...
• - Heavy metals 1. are toxic
• 2. are non biodegradable
• 3. have ability to accumulate in tissues

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Removal of heavy metals from water
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• - Different methods for removal of heavy metals
  chemical precipitation, activated carbon
  adsorption, ionexchange, electrochemical methods,
  etc.
• - Today, the most researched method is
  biosorption by the means of natural materials ie
  biomass.

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Biosorption
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• - Heavy metal ions accumulate on surface area
  between solution and biosorbent particles
• - Biosorbents have active sites on the surface,
  that are different functional groups (hydroxyl,
  carboxyl...)

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Inffluence of pH value
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• Biosorption depends on biosorbent and adsorbate
  types, contact time of biosorbent and adsorbate
  solution, temperature, ionic strenght of
  solution, pH value, etc.
• pH value affects heavy metal ions and functional
  groups of active sites.
• Removal of copper ions by sugar beet shreds as
  adsorbent, at different pH values of solution, is
  investigated .
• Buffer solutions and hydroxides (NaOH and NH4OH)
  were used for adjustment of pH values.

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Inffluence of pH value
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• -Sugar beet shred fraction is 224-400µm
• -The copper concentration in the solution is
  50mg/l
• -pH value is determine before the addition of
  adsorbent
• -Time of the adsorption is 90 minutes.
• -The adsorbent is separated by filtration (filter
  paper Macherey-Nagel 651/120)
• -The copper concentration in solutions is
  determined by complexometric titration, before
  and after adsorption.

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Adjustment of pH value with sodium hydroxide
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Adjustment of pH value with ammonium hydroxide
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Adjustment of pH value with buffer
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Conclusion
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• Many factors influence process of adsorption.
  Adsorption efficiency also depends on the type of
  substance which is used for adjustment of pH
  value. Before some biosorbent is applied into the
  practice, it is important to determine in detail
  the working conditions in laboratory scale.

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Thanks for your attention!
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Presentation/lecture has been produced with the
financial assistance of the European Union. The
content of the presentation/lecture is the sole
responsibility of University of Novi Sad,
Faculty of Technology and can under no
circumstances be regarded as reflecting the
position of the European Union and/or the
Managing Authority.