SGS-Polymers (Application fields)
                         Purification of Aqueous Solutions
Containing Dissolved and Emulsified
Organic Compounds

 

 
 


 
 
 
Purification of aqueous solutions containing
dissolved and emulsified organic compounds
zu: Reinigung wäßriger Lösungen von gelösten und emulgierten Organika
Removal of zinc, lead, copper, cadmium and mercury
from waste water
zu: Abtrennung von Zink, Blei, Kupfer, Cadmium und Quecksilber aus Abwasser
Removal of arsenic from wash solutions
of the sulphuric acid production
zu: Abtrennung von Arsen aus Waschlösungen der Schwefelsäureproduktion

 


Purification of aqueous solutions containing

dissolved and emulsified organic compounds



 

The pollution of water with dissolved and emulsified organic compounds is an important environmental problem.
SGS-polymers with lipophilic groups in their structure were developed. These SGS-polymers can be used for the adsorption of dissolved organic compounds from water. Furthermore, they can be applied for the destruction of emulsions. Typical compounds, which can be sorbed or separated, are e.g. greases, oils, products of mineral oil and detergents. Both dissolved salts and acids do not influence the purification process.

The regeneration is carried out by countercurrent pressing of air or water steam through the filter cartridges. Another regeneration method is the solvent extraction. Low-molecular alcohols or ketones are used in this process.

There are two possibilities for extracting emulsified organic compounds by the help of SGS-polymer type 8:

Adsorption (removal of organic compounds by attaching these organic compounds on the inner surface of SGS-polymers):
Organic compounds in the water are sorbed on the polymers up to the attainable maximum load. In this case the regeneration of the sorbent is carried out by steam (overheated water vapour). The concentration of organic compounds can be reduced to less than 0.1 mg/l.

Coalescence (deemulsification by enlarging the surface):
After reaching the maximum load of the organic compounds on the polymer the emulsion is nearly immediately separated into an aqueous and an organic phase within the polymer. The concentration of the organic compounds in the water phase as well as the content of water in the organic phase depend on the solubilities. In this case any steam regeneration is not necessary.
 
 
 

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October 2001
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