Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2008
Volume 11
Issue 4
Topic:
Environmental Development
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Wolna-Maruwka A. , Jędru¶ A. 2008. EFFECT OF SEWAGE SLUDGE COMPOSTING PROCESS IN CYBERNETIC BIOREACTOR ON THE NUMBER OF SELECTED MICROORGANISMS GROUPS AND PROTEASES ACTIVITY, EJPAU 11(4), #27.
Available Online: http://www.ejpau.media.pl/volume11/issue4/abs-27.html

EFFECT OF SEWAGE SLUDGE COMPOSTING PROCESS IN CYBERNETIC BIOREACTOR ON THE NUMBER OF SELECTED MICROORGANISMS GROUPS AND PROTEASES ACTIVITY

Agnieszka Wolna-Maruwka1, Aleksander Jędru¶2
1 Department of Agricultural Microbiology, University of Life Sciences, Poznań, Poland
2 Institute of Agricultural Engineering, University of Life Sciences, Poznań, Poland

 

ABSTRACT

Microbiological chatracteristics of sewage sludge
from mechanical and biological sewage treatment plant composted in controlled
conditions with straw and sawdust are presented. Prepared composts were placed
in four bioreactors with air flow 4 l O2 · min-1. In bioreactor
K1, K2 and K3 the composted mass consisted of 65 % sewage sludge (K1-sewage sludge
1, K2 – sludge 2, K3 – sludge 3) + 30 % sawdust + 5 % straw, while in bioreactor
K4 the proportion was: 45 % sludge 2 + 50 % sawdust + 5 % straw. Compost samples
were taken from all chambers at the same time depending on the actual temperature. Microbiological analyses consisted in the determination by plate method on selective medium the numbers of cellulolitic,
proteolitic and solving phosphates microorganisms. Furthermore, in the experiment,
the activity levels of proteases were determined using 1 % sodium caseinate as
substratum. Studies have shown that the most intensive reproduction of cells of the studied
groups of microorganisms were recorded after 20 hours of composting (term II),
while the maximal level of proteolitic activity occurred between the 20th and
66th hour of the composting process. Furthermore, it was found that the composting
process caused a decrease in the number of the analysed microorganism groups
in the majority of composts.

Key words: microorganisms, proteolitic activity, biowaste, sewage sludge.

Agnieszka Wolna-Maruwka
Department of Agricultural Microbiology,
University of Life Sciences, Poznań, Poland
Szydłowska 50, 60-656 Poznań, Poland
email: amaruwka@interia.pl

Aleksander Jędru¶
Institute of Agricultural Engineering,
University of Life Sciences, Poznań, Poland
Wojska Polskiego 50; 60-625 Poznań
email: aljed@interia.pl

Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.

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