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Możliwości przyrodniczego wykorzystania osadów ściekowych z miejskich oczyszczalni ścieków na terenie Polski Północnej

Siedlecka E., Downar D., Bojanowska I.

Ekologia i Technika

2002

R. 10, nr 5

148-159

Natural utilization of sewage sludge from big municipal treatment plants for reclamation of degraded lands as well as for fertilization of the green areas is a rational and cheap method of the sewage sludge disposal. However, the care about the sewage quality is required. Accomplishment of this task calls for collaboration among research centers, land administration and industrial plants in order to reduce the pollution at its source (sewage pretreatment in factories) resulting in reduction of heavy metals concentration in sewage i.e. also in sludge. Agricultural utilization of sludge is a difficult problem in the Żuławy region. The soils are fertile there and they do not need to be fertilized. Taking into account the fact that the amounts of sludge in this region are not high (from several to a dozen or so of m3 per day), they can be locally managed in forest nurseries, parks or green areas without equilibrium disturbances in the individual ecosystems. The sludge from sewage treatment plants in Gdańsk, Gdynia and Sopot have been utilized for many years for reclamation of degraded land in industrial areas (areas around Siarkopol, phosphogypsum disposal site in Wiślinka, disposal site for ashes from heat and power generating plant EC-11 in Przegalin and Wiślinka, Gdynia Shipyard and Northern Shipyard areas). The sewage sludge can be utilized for fertilization of non-arable lands, for example forest nurseries, lawns in new housing estates, parks and green areas. This method of sewage sludge utilization is worth recommending since the areas in the "Three-towns" region destined for housing are situated on poor soils.