Efficacy Survey of Some Sewage-Treatment Plant-Systems on Pig Farms in Slovakia

Veterinarni Medicina 39, 1994, 677-686

Bacteriological, helminthological and physico-chemical examinations were carried out to investigate the technological procedure in three water treatment plants treating slurry from large-capacity pig farms (Kosicka Polianka, Spisske Vlachy, Velky Dur). Our investigations were focused on the testing of effectiveness of mechanical, chemical and biological treatment system most frequently used in Slovakia. Our investigations revealed that water-treatment plants, operating on pig farms, fulfil only the supplies management requirements concerning the treated water, discharged into the recipient. From the hygienic viewpoint further processing or utilization of the solid fraction remains unsolved. This fraction contains considerable concentrations of bacteria and parasitic germs (Ascaris suum, Trichuris suis, Isospora sp., Eimeria sp.) most of which exhibit high tenacity in the environment. It is recommended to process this solid fraction by composting before it is applied as a manure. However, the measured values did not exceed the reference hygienic limits. The technological stage of chemical treatment, which follows after the separation and utilizes some coagulants (aluminium sulphate, ferrous sulphate), can increase the chemical load of water stripped of crude organic pollutants, by some undesirable chemical elements

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