CHANGES IN CHEMICAL PROPERTIES OF STORED ...

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the unturned 2% zeolite-amended substrate. INTRODUCTION. Searching for economically acceptable and ecologically meaningful treatment and disposal of.
CHANGES IN CHEMICAL PROPERTIES OF STORED PIG SLURRY SOLIDS AMENDED WITH ZEOLITE VENGLOVSKÝ, J.*, SASÁKOVÁ, N.*, VARGOVÁ, M.** *

Research Institute of Veterinary Medicine, Hlinkova 1/A, 040 01 Košice, Slovak Republic ** University of Veterinary Medicine, Komenského 73, 041 81 Košice, Slovak Republic

ABSTRACT The solid fraction of pig slurry, separated in the initial stage of slurry treatment, presents a risk due to high concentration of nutrients and contamination with bacteria, viruses and parasites. It should be composted before disposal to cropland. However, under practical conditions, simple storage without adding some bulking agents has been practiced frequently. Substrates (50-55 kg) prepared by mixing the solid fraction of pig slurry with 1% and 2% (by weight) natural powder zeolite (clinoptilolite) mined in Slovakia were stored for 12 weeks under anaerobic conditions and with turning after 3 and 6 weeks. Temperature in the core of substrates recorded in 1 h intervals did not reach the thermophilic range. During the first 6 weeks the highest temperature was in the controls while zeolite-amended substrates reached higher temperature level. This was ascribed to high initial moisture content (76.5-78.5%) and insufficient aeration. Insignificant effect of zeolite on pH, total N and total P was observed. The effect of zeolite-amendment on dry matter and ash content was significant (P

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