Technical gazette, Vol. 29 No. 6, 2022.
Original scientific paper
https://doi.org/10.17559/TV-20211122093219
Modelling the Compost Parameters During Mechanized Aerobic Fermentation
Vjekoslav Tadić
orcid.org/0000-0002-2307-9255
; University of J. J. Strossmayer in Osijek, Faculty of Agrobiotehnical Sciences Osijek, Vladimira Preloga 1, 31000 Osijek, Croatia
Kurt Tomantschger
; University of technology Graz, Faculty of Mathematics, Physics and Geodesy, Steyrergasse 30, 8010 Graz, Austria
Dragan V. Petrović
; University of Belgrade, Faculty of Agriculture, Nemanjina 6, 11 081 Belgrade - Zemun, Serbia
Rade L. Radojević
; University of Belgrade, Faculty of Agriculture, Nemanjina 6, 11 081 Belgrade - Zemun, Serbia
Dušan Ž. Radivojević
; University of Belgrade, Faculty of Agriculture, Nemanjina 6, 11 081 Belgrade - Zemun, Serbia
Abstract
The article is focused on the behaviour of the basic properties of dairy cow's solid manure over the maturation period. The manure was exposed to mechanized aerobic processing by mechanically turning-over. Performed analysis comprehended measurements of mass participation percentages of organic components, mineral matters, H2O, N, P2O5 and K2O, as well as measurements of PH-values during the seven weeks of supervised test period of effective aerobic preparation of the composting material. Through maturation, large growth of averaged mass percentages of nitrogen, phosphorous-pentoxide and potassium-oxide, more than triple in comparison to the initial levels in a fresh solid, has been verified. Following a possible common approach in the scientific and technical practice, an analytical semi-empirical approach was used in describing the changes over the time of manure properties during composting, supported by prototype of the machine Kompomat 1. Combining the analytical theory of diffusion partial differential equations and application of numerical methods to non-linear fitting of the experimental output data, it was verified that all acquired manure parameters follow an identical general exponential law (R2all properties = 0,906 - 0,990; RMSEall properties = 0,010 - 2,544). Clear relationships between the values of basic parameters of solid manure under mechanized aerobic fermentation (y) and composting duration lap time (x) have been established.
Keywords
compost; cows machine; diffusion equation; fertilizer; manure; maturation
Hrčak ID:
284900
URI
Publication date:
29.10.2022.
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