Decomposition processes in stored pig slurry solids treated with different doses of natural zeolite
2002
Vargova, M. | Ondrasovicova, O. | Ondrasovic, M. | Sasakova, N. | Falis, M. | Silva, J.A. da (University of Veterinary Medicine, Kosice (Slovak Republic))
The study was conducted on pig slurry solids separated in the first stage of pig slurry treatment with activated sludge. Two kg portions of slurry solids were treated with 1, 2, 3, and 4% by weight of natural powder zeolite clinoptilolite and stored for 10 weeks in thermally insulated plastic bags without the access of air except for mixing and sampling after 1, 2, 3, 4, 4, 5, 6, 7, 8, and 10 weeks of storage. The untreated control was handled in the same way. Throughout the experiment, the temperature in the core of substrates remained below 33 degree C, and no positive effect of zeolite was observed. Zeolite treatment affected significantly (P 0.01) the dry matter content and residue on ignition. The pH values of water extracts were the highest (6.43-6.82) in the control and lowest (5.77-5.80) in the substrates with 4% and 3% of zeolite for most of the experiment. The level of extractable ammonia was the lowest in the substrates with zeolite and the highest in the control. The latter indicates considerable potential of zeolite to decrease environmental pollution after the application of pig slurry solids to cropland
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