Abstract
The problem of utilization and management of sewage sludge originating from small wastewater treatment plants is still unsolved in Poland. One of the waste-free technologies of sludge utilization is the reed bed method. Two experimental facilities of this type have been operating for four years in the Gdansk Region: a reed bed in Darżlubie and a reed lagoon in Swarzewo. The investigation was aimed at evaluating the influence of the storage on chemical and biological properties of sewage sludge deposited in beds. Tests were carried out in the period of two years. Moisture, organic matter, total nitrogen and total phosphorus contents as well as coli index, Clostridium perfringens index and number of Ascaris lumbricoides eggs analyzes were measured. Analyses of contents of heavy metals Cu, Pb, Ni, Zn, Cr and Cd for sludge samples from Darżlubie were additionally carried out. Tests proved that the utilization of sludge in reed beds allows using the end product as a fertilizer in agriculture. The most important problem is increasing of heavy metals content and number of Ascaris lumbricoides per mass of sludge during long time storage.
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