It is the most efficient and economical solution to treat wastewater containing biodegradable compounds. This plant is based on the use of bacteria and microorganisms, which can destroy organic and polluting matter if they are kept under specific environmental conditions. CO2, water, mineral salts and inorganic compounds are the final products of the metabolism of organic matter that also produces the growth and development of activated biomass.


In addition to a biological plant, they include a series of advanced treatments that permit to remove specific organic or inorganic pollutants, in order to reuse part of the effluent in other industrial processes (the recycling effluent is used as “process water of process”).


They are plants that do not include any liquid discharge, related neither to service water nor to process one. The ZLD is the result of a total recycling of the water discharged from the industrial process, in conjunction with a total reuse of treated water and a partial recycling of some chemical components contained in it. The final residue is composed of the crystals of dissolved salts and a part of the organic and not biodegradable components.


They are plants designed for the primary water treatment. They include simple solutions such as water softening, iron removal, de-chlorination, etc. and more advanced solutions such as demineralization, production of ultra-pure water and water with very low conductivity.


Europrogetti S.r.l. is a company that, for more than 30 years, offers to customers its expertise in the design, installation and management of plants for treatment, purification and reuse of civil and industrial water sewage. We can offer solutions which allow the recycling of more than 90% of treated water and we also guarantee the lowest running costs thanks to the implementation of the most efficient and advanced technologies in the field.

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Phone number: +39 049 6988432
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ISPESSIMENTO1The thickening is a process that increases the solids matter of the sludge, removing part of the water associated with it, and consequently reduces its volume. This treatment is an aid for the next processes of the sludge, such as digestion, dehydration, drying and combustion, in many points of view:

  • Smaller required tanks and equipment
  • Lower quantity of chemical reagents required for conditioning the sludge
  • Lower quantity of heat to be supplied to the digester or the quantity of auxiliary fuel required for the processes of drying or thermal incineration.

The thickening by gravity is the most used system; it is conceptually similar to the conventional clarifier process and it requires a dedicated tank, where the sludge settles and compacts. Once thickened, the sludge is conveyed to the conical pit on the bottom of the tank, through an agitator with scraping blades. Generally, this agitator has also some arms, which keep homogeneous the sludge, avoiding the formation of more or less concentrated areas and, thus, optimizing the feeding to the dehydrator machine.
ISPESSIMENTO2Il surnatante viene estratto dalla parte superiore della vasca e ricircolato in testa alla linea di trattamento acqua. 
Often, to facilitate and speed up the thickening of sludge, it is provided the dosage of polymer (polyelectrolyte) in the tank, which have the additional advantage of mechanically preparing the sludge to the next stages of dehydration.





This technology is an integral part of the treatment process of a Biological plant and Primary water treatment.

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