Sludge

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Sewage pits - according to technical terminology are a by-product of the purification of industrial and municipal sewage (household - economic). They can be of practical importance as they contain organic matter and biogenic elements. The amount of organic matter in the dry matter in sewage sludge varies from 2.6-11.4% in hydrated sediments, and in dehydrated sediments to over 50%. Their chemical composition, therefore, promotes reuse in the soil. However, due to the presence of heavy metals and pathogenic microorganisms (pathogenic bacteria), there is a need to adapt to legal norms that allow the use of only unprocessed sewage sludge in agriculture. Currently, they may be important, as soil improver or for engineering purposes, during the reclamation of devastated areas after checking the permissible levels of heavy metal concentrations, according to the Minister of Environment of 6 February 2015 on municipal sewage sludge (OJ of 2015, item 257),. Sewage sludges with appropriate mixtures are suitable for phytoremediation purposes.



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