Invasive Species Compendium

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Abstract

Reclamation of irrigation fields in Bydgoszcz with the use of phytoremediation methods.

Abstract

The irrigation fields in Bydgoszcz city were exploited within the years 1907-2003. The Management of Municipal Water Supply and Sewerage Systems in Bydgoszcz began to investigate the condition of ground-water environment in July 2002, i.e. still in the course of exploitation; investigations were continued until 2009. Sewage sludges from the municipal outfalls have been classified as dangerous owing to high contents of heavy metals (Zn, Pb, Cr, Cd, Hg, Ba) and three pesticides (DDD, DDE, y-HCH). The reclamation was begun by dislocation of the sludges from ground settling tanks on concrete trays, demolition of concrete elements, cutting of redundant vegetation, levelling of the dykes and settling tanks. On the terrain prepared in such a way, the basket willow (Salix viminalis), brome grass (Bromus inermis) and nettle (Urtica dioica) were introduced in 2008. All mentioned plants revealed particular abilities to accumulate the heavy metals in their tissues. The contents of heavy metals were also tested in biomass of hovel plant species, such as the orach (Artiplex nitens), hemp (Cannabis sativa) and Canada goldenrod (Solidago canadensis), appearing spontaneously on the terrain under investigation.