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Abstract

The paper contains a micobiological characteristic of sewage sludge composted in controlled conditions together with bio-wastes (straw, sawdust, bark). An experiment was carried out in which the composted material was mixed up in adequate weight proportion and placed in biorcactor chambers with a constant air flow. The composting process aimed at defining the development dynamics and the survival of pathogenic microorganisms in the sewage sludge composted with different additions in a cybernetic bioreactor. Samples of compost necessary for microbiological analyses were taken at the same time, in reference to the actual temperature value. Bacteriological studies were carried out on selected substrates by plate method determining the number of pathogenic bacteria from the species: Salmonella, Clostridium perfringens, as well as from Enterobacteriaccac family. In the experiments, the presence of living eggs or intestinal ATT pathogens was determined by floatation method, as well. Il was found that the sewage sludge used in composting process did not contain any Salmonella spp. bacteria or any living eggs of intestinal ATT pathogens. Composting process completely eliminated the number or bacteria from Enterobactcriaccae family, bul it did not contribute lo the elimination of Clostridium perfringens bacteria. On the basis of the obtained results, it was found that the elimination of the studied groups of microorganisms, in all studied composts took place with the increase of temperature. In the case or Enterobacteriaceae, it was found that their complete removal from the composted material took place in chamber K3, while in the remaining chambers, it followed 48 hours later. Elimination ofthe vegetative forms ofC!oslridium perfringens bacteria followed after 96 hours of composting, in all composts at the same time. The obtained composts met the sanitary norms according lo the regulations of the EC Commission No. I 85/2007 of February 20, 2007 which changed the regulation of WE No. 809/2003 and WE No. 810/2003 referring to the extension of the validity period of transitional means for composting plants and biogas producing plants according to the instruction orWE No. 1774/2002 of European Parliament and Council and according to the instruction of the Minister for Agriculture and Country Development (2004).
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Authors and Affiliations

Agnieszka Wolna-Maruwka
Jacek Dach
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Abstract

In this article, we look at the subjectless sentences with a copula, non‑verbal part of the predicate and a dative constituent. We call them ‘dative‑predicative structures’ (DPS). They express a state or attitude towards a certain situation from the dative referent’s perspective. The main goal is to determine the role of the dative in the semantic and pragmatic features of the construction. There are four types of lexemes used in the predicative position in DPS. They are related to the three types of situations that are expressed: direct involvement, indirect involvement and external observation. The comparison of the DPS with the corresponding constructions without a dative argument (predicative structures – PS) shows that the dative introduces a subjective tone which softens the claim. This is especially evident in the third type of meaning, where judgement and assessment is expressed. In that respect Macedonian shows similar tendencies as Serbian and Slovenian: DPS is expanding more for expressing assessment of the situation, and less for characterizing the current situation.
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Bibliography

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Gradinarova A., 2010, Bezlichnyye konstruktsii s datel'nym sub''yekta i predikativom na ‑o v ruskom i bolgarskom jazykakh, „Bolgarskaya rusistika“, No. 3–4, pp. 34–55.
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Authors and Affiliations

Liljana Mitkovska
1 2
ORCID: ORCID

  1. University of Ss. Cyril and Methodius, Skopje
  2. Silesian University, Katowice
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Abstract

A particle-level simulation technique has been developed for modelling fibre suspension flow in a converging channel of a papermachine headbox. The fibre model is represented by a chain of elements connected together. The model was verified by the simulation of rigid fibre dynamics in a simple shear flow. The period of rotation was found to be in a very good agreement with theory and reference data. The model was then employed to simulate fibre motion in a converging channel of a papermachine headbox. Fibre suspension motion was resolved using two-step procedure. Velocity field was calculated by means of a commercial CFD code ANSYS Fluent with RSM turbulence model applied and used as an input to the in-house code allowing to simulate fibre dynamics. Results of the calculations were used to construct the fibre orientation probability distribution (FOPD) which was found to be consistent with available experimental data.

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Authors and Affiliations

Grzegorz Kondora
Dariusz Asendrych

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