Azud Watertech DW S purifies water with sílex and anthracite media filtration to provide the required standard of potable water for municipalities and industries.
The purification techniques implemented depend on the type of problem or pollutant detection. Typically, in the same water treatment plant, different technologies combine in such a way to ensure gradual and selective water treatment. Each technology “protects the rear,” allowing each to function solely on the technical pollutant for which it was designed, and together provide a comprehensive solution.
Granular bed filters: Water with average turbidity (<10 NTU) passes through a multilayer bed filter with size and specific gravity range; suspended solids larger than 1 µm remain at the filter bed. Cleaning is done automatically through collector arms in the opposite direction of the filtrate flow.
Ultrafiltration membranes: Water with high turbidity (10-50 NTU) passes through a set of PVDF hollow fiber membranes. Water is passed at outside-inside flow. Particles larger than 0.03 µm are retained at fibers (suspended solids, colloids, bacteria and viruses). Permeate and chemical cleaning is done automatically in the opposite direction of the filtrate flow.
WATER CONTAINING PESTICIDES
Activated carbon filter: Water passes through an activated carbon bed filter, (carbonized material with high porosity), which allows water to pass while trapping pesticides, chlorinated compounds, and a precursor of odor, color and taste on the filter surface. Cleaning is done automatically through collector arms in the opposite direction of the filtrate flow.
WATER WITH DISSOLVED SALTS OR HEAVY METALS
Reverse osmosis applies high pressure (osmotic pressure) on a solution with a high concentration of salts that comes in contact with a semipermeable membrane. This reverses the natural process of osmosis to allow the passage of water and retention of salts and results in fresh (salt-free) water.
Reverse osmosis membranes are flat, made of organic materials and spirally wound around a perforated central tube that collects permeate. The membranes have a standard length (1 meter) and diameter (2.5”, 4” o 8”). The membranes are linked together and encapsulated in high-pressure vessels.
WATER WITH IRON OR MANGANESE
Pirolusite/manganese greensand filters: For water with a high concentration of iron or manganese, water passes through manganese greensand bed filter (manganese dioxide) and flint, allows water to pass, while oxidizing and traping iron or manganese presented in the filter material. Cleaning is done automatically through collector arms in the opposite direction of the filtrate flow.