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

.. 1st Students Meeting Waterfriend Inffluence of pH value on adsorption efficiency of heavy metals from water Mina Jandrić

.. 1st Students Meeting Waterfriend INTRODUCTION  Rapidly progress of industry –increased environmental pollution  Heavy metals in water and wasterwater-big concern and danger for living world

.. 1st Students Meeting Waterfriend Characteristics of heavy metals -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

.. 1st Students Meeting Waterfriend Removal of heavy metals from water - 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.

.. 1st Students Meeting Waterfriend Biosorption - 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...)

.. 1st Students Meeting Waterfriend Inffluence of pH value  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 NH 4 OH) were used for adjustment of pH values.

.. 1st Students Meeting Waterfriend Inffluence of pH value -Sugar beet shred fraction is μm -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.

.. 1st Students Meeting Waterfriend Adjustment of pH value with sodium hydroxide

.. 1st Students Meeting Waterfriend Adjustment of pH value with ammonium hydroxide

.. 1st Students Meeting Waterfriend Adjustment of pH value with buffer

.. 1st Students Meeting Waterfriend Conclusion 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.

.. 1st Students Meeting Waterfriend 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. Thanks for your attention!