Terms used in official statistics

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Sewage sludge from wastewater treatment and pre-treatment plants generated


Sludge from wastewater treatment plants coming from fermentation tanks and other equpment used for treatment municipal sewage. Sewage sludge is the product of sewage treatment and is formed through a series of physical, physico-chemical and biological processes occuring in wastewater treatment and pre-treatment plants.

In facilities for wastewater treatment, the following types of hydrated sewage sludge are generated:

  • sludge pumped from putrid settling tanks,
  • sludge removed from Imhoff's tanks,
  • excessive sludge removed from activated sludge devices and rinsed from biofilters,
  • polluted sand filers, so called fen soils.

Contact person on methodology:
GUS – Departament Rolnictwa i Środowiska