Stabilisation of the solid fraction of pig slurry at the presence of natural zeolite
1998
Vargova, M. | Ondrasovicova, O. | Ondrasovic, M. (Univerzita Veterinarskeho Lekarstva, Kosice (Slovak Republic)) | Sasakova, N. | Venglovsky, J. | Galajda, R. (Ustav Experimentalnej Veterinarnej Mediciny, Kosice (Slovak Republic))
The influence on decomposition processes of 1% and 2% natural zeolite (clinoptilolite) added to the solid fraction of pig slurry was investigated during 12 weeks of storage at 18-25 deg C. The presence of zeolite affected the course of temperatures in the core of the substrates as well as the chemical parameters investigated (pH, dry matter, loss on ignition, N sub(c), P sub(c)). Temperatures in the core of substrates 1-3 (S1 - control, S2 - 1% of zeolite, S3 - 2% of zeolite) differed during most of the period investigated. The highest temperature in the substrate was recorded in the control (37.1 deg C) in week 4 of the experiment. Maximum temperatures in the core of substrates amended with zeolite (32.5 deg C and 33.1 deg C) were recorded in weeks 9 and 10 of the experiment, respectively. The pH in the extracts of substrates 2 and 3 after 3 weeks of storage, substrate 3 after 6 weeks of storage and substrate 2 after 12 weeks of storage were significantly different than the control and corresponded to the temperatures in the core of substrates dependent on microbial decomposition processes. In the first stage of the experiment, the dry matter content of the substrates was affected predominantly by the release of the retained water and later on by fermentation processes. The determination of the influence of zeolites on total nitrogen must take into account other factors not published in this study. An important influence of zeolite was observed with regard to the values of total phosphorus, mainly in the substrate 3 in which the content of P sub(c) was twice as high as that in the control after 6 and 12 weeks storage. The values of parameters determined and course of temperatures in the core of the substrates point to the different influence of 1% and 2% zeolite on microbial decomposition processes in the medium studied
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