Sludge Composting

Find an alternative final disposal site for the sludge produced at the WWTPs with a view to producing a fertiliser with agronomic characteristics that can improve the physical-chemical and biological properties of soils.


  • Dimensioning of Composting Plants for WWTP sludge

  • Management of the biological decomposition process of sludge organic matter: aeration, humidity, pH and range of microorganisms similar to humus

  • Operation of the Composting Plant


Luságua, as a service provider of SMEAS in Maia, has been managing the operation and maintenance activities of the Sludge Composting Plant of the Parada WWTP since 1994.

Size of the Maia Plant

12,050 tons per year

Characteristics of the raw materials

Sludge and structuring material

Brief description of the solution

   The sludge composting process involves the biological decomposition of the organic matter in the sludge in the presence of microorganisms (bacteria, actinomycetes and fungi) under aerobic and controlled conditions of pH, humidity and aeration, into a stable product similar to humus.
   Final product: hygienic and odourless product, rich in organic matter, free of seeds and propagules.
   Advantages: Production of compost with commercial value – Reduced transportation costs and disposal of waste and by-products.

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