Drinking water purification

Drinking water is our most important sustenance

For the preparation of drinking water for human consumption, raw water is processed from different sources that have different qualities. These can be surface waters from dams and streams as well as groundwater. Organic substances (algae, detritus, etc.) are precipitated from surface waters by the addition of inorganic primary flocculants.

Removal of dissolved iron and manganese from groundwater is generally carried out by intensive aeration, after which both metals are precipitated in the form of their hydroxides or oxides. Following these primary processing steps, the following filtration, sedimentation and dewatering processes can be significantly increased by the use of polymeric flocculation based on polyacrylamide.

Eindickung von Filterrückspülwasser über Bandeindicker

Thickening of filter rinsing water by band thickener

Advantages of using polymer flocculants

  • Longer service life and safe separation of solids in fast and slow filters
  • More rapid sedimentation and higher solids contents during static thickening of the filter rinse water
  • Higher concentration in further water separation e.g. on band thickeners
  • Optimized filtration times and a high solids content in the filter cake during dewatering with chamber filter presses

Polymer flocculants in drinking water quality

HeGo Biotec GmbH offers, in the GoFloc® PWG product line based on polyacrylamide, polyamines and polydadmacs (PWG – potable water grade), flocculants which meet all the following European Standards:

  • DIN EN 1407-Anionic and nonionic polyacrylamides
  • DIN EN 1408-Poly (diallyldimethylammonium chloride)
  • DIN EN 1409-Polyamines
  • DIN EN 1410-Cationic polyacrylamides

GoFloc® series: products with drinking water approval

trinkwasser-grafik_engl

Gofloc®-TW products are approved for drinking water treatment among others in the following countries:

  • Germany-TrinkwV
  • United Kingdom-D.W.I.
  • Netherlands-KIWA
  • USA-ANSI/NSF

Anionic and nonionic drinking water products are considerably below the limit for the residual content of monomeric acrylamide of 200 ppm, as set out in the list of preparations and disinfection methods (§11 TrinkwV 2001, 17. Amendment, as of November 2012).

By specific selection of production batches of anionic and nonionic flocculants, residual monomer contents below 150 ppm can be reached for particularly sensitive applications.