Naslov
Removal of heavy metals from pig slurry by activated sludge treatment.

Autori
Vargova, Milada ; Venglovský, Jan ; Sasáková, Nada ; Ondrašovičevá, Olga ; Ondrašovič, M. ; Saviatko, P. ; Vučemilo, Marija ; Tofant, Alenka

Izvornik
Stočarstvo (0351-0832) 55 (2001), 6; 411-417

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, kongresno priopcenje, znanstveni

Ključne riječi
slurry treatment; heavy metals; influent; effluent; pig slurry solids

Sažetak
The presence and levels of heavy metals in pig excrements are a subject of concern as they may pass to those products of the treatment which are either discharged into the recipient ( effluent) or are applied to the soil (solid fraction) and may pollute the environment. Through contamination of surface water and soil the metals can penetrate in the food chain of animals and humans. The aim of our study was to investigate the levels of some metals of interest in different stages of treatment of pig slurry by activated sludge (influent, effluent and solid fraction) in relation to their release to the environment and its possible contamination. Our results showed that the effectiveness of removal of metals by the activated sludge system was high. Although the limits for presence of some metals (Pb, Hg, Cu, Zn) in surface water were exceeded in some samples of the effluent, with regard to its further considerable dilution in the recipient no serious risk to surface water quality is envisaged. The levels of dangerous heavy metals (Cd, Pb, Hg) in the separated solid fraction were far below the limits required for composted biosolids intended for application to agricultural land.

Izvorni jezik
Engleski

Znanstvena područja
Šumarstvo

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