Arsenic removal

Funding:

DAAD, TUHH
Duration:01.10.2016 – 30.09.2020

project management / project work:

Prof. Dr.-Ing. M. Ernst / M. Usman, M.Sc.

Situation:

Arsenic is internationally one of the major pollutants in municipal drinking water and a worldwide concern because of its toxicity and chronic effects on human health. To remove arsenic from drinking water several techniques including adsorption onto iron oxide-based adsorbents exist. Granular ferric hydroxide (GEH, Wasserchemie GmbH & Co. KG, Osnabrück) with individual particle size ranges between 0.320 – 2.0 mm can be applied in fixed bed columns for continuous media filteration. However, this porous media is relatively cost intensive. During industrial production of GEH a fine fraction of grains with particle size less than 0.25 mm is generated that cannot be applied in continuous filtration systems as it leads to rapid clogging of fixed-bed columns. In the current project, arsenic removal is to be achieved using adsorption-low pressure membrane filtration hybrid system.
Methodology:

The fine fractions of GEH and other adsorbents are used for arsenic removal from drinking water in adsorption-membrane hybrid system at various operation conditions. In hybrid system the entire treatment activity (such as adsorption, liquid-solid separation, and sludge accumulation and withdrawal) will be carried out in a single unit. The results will be compared with known transport models (homogeneous surface diffusion model) and, if necessary, model adjustments will be carried out. Model predictions will be based on adsorption equilibrium and kinetic parameters determined from isotherm and batch experiments, respectively.