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Effect of Polonite used for phosphorus removal from wastewater on soil properties and fertility of a mountain meadow

Cucarella, Victor, Mazurek, Ryszard, Zaleski, Tomasz, Kopeć, Michal, Renman, Gunno
Environmental pollution 2009 v.157 no.7 pp. 2147-2152
wastewater treatment, phosphorus, water filters, physicochemical properties, soil amendments, soil pH, acid soils, soil properties, soil pollution, sorption, grasslands, fertilizer application, nutrient uptake, biomass, Poland
Reactive filter materials used for phosphorus (P) removal from wastewater can be disposed of as soil amendments after treatment, thus recycling P and other macro- and micro-nutrients to plants. In addition, materials with a high pH and Ca content, such as Polonite, are potential soil conditioners, which can be particularly beneficial for acid soils. Polonite previously used for on-site wastewater treatment was applied as a soil amendment to a mountain meadow. The amendment significantly increased soil pH and decreased the hydrolytic acidity, thus reducing Al toxicity risks. The effects were comparable to those of liming. No difference in yield and P uptake by meadow plants was observed. The uptake of metals was lower for amended soils, especially the uptake of Mn. Using Polonite after wastewater treatment as a soil amendment is thus a viable disposal alternative that can replace liming, when necessary, being capable of recycling P and other nutrients to meadow plants. Filter substrate Polonite can benefit acid soils after wastewater treatment.