Przeżywalność fekalnych indykatorów w procesie kompostowania osadów ściekowych

• Autorzy: Szala B. , Breza-Boruta B.

Warianty tytułu

EN

Survival of faecal indicators in the process of sewage sludge composting

• Języki publikacji: PL

Abstrakty

PL

Badano wpływ procesu kompostowania w technologii kontenerowej na inak-tywacje pałeczek Escherichia coli i streptokoków kałowych. Bakterie w nośnikach wprowadzano do górnej, środkowej i dolnej warstwy kompostowanego materiału. Doświadczenia prowadzono w cyklach letnim i jesiennym. Badania dowiodły, że tempo eliminacji pałeczek coli w nośnikach było szybsze niż paciorkowców kałowych. Higienizacja materiału nastąpiła szybciej w cyklu letnim - po 28 dniach nie stwierdzono obecności pałeczek coli w nośnikach. Koncentracja paciorkowców w tym samym czasie obniżyła się z 2,07-109 NPL∙g-1 do 2,33 103 NPL∙g-1 w warstwie górnej i do 3,83-102 NPL∙g-1 w warstwie dolnej. W cyklu jesiennym zaobserwowano bardzo powolne tempo inaktywacji paciorkowców szczególnie w warstwie dolnej. Tym samym stwierdzono, że dolne warstwy kompostowanej biomasy stanowią strefę zagrożenia. Badania wykazały, że temperatura nie jest jedynym czynnikiem inaktywacji patogenów w czasie procesu kompostowania. Oddziaływania biotyczne także pełnią ważną rolę.

EN

Besides traditional methods of composting in windrows, systems based on closed vessel in which there is a considerably greater possibility of controlling the process and reducing gas emission to the atmosphere, have been receiving particular attention. Due to frequent occurrence of pathogenic organisms in organic wastes, there is a need for a microbiological evaluation of the utilization process in the case of using them for agricultural purposes. The aim of this study was to assess the sanitization effectiveness of the container technology in the process of composting of organic waste with sewage sludge by means of determining the survival rate of indicator bacteria Escherichia coli and faecal streptococci. The study was conducted during the summer and autumn, placing specially prepared carriers at the top, middle and bottom layers of the composted biomass. The successive carriers were removed at intervals of several days and subjected to microbiological analysis. Determination of bacteria number were made on the basis of the most probable number method (MPN). The results obtained were subjected to the statistical analysis using the program Statistica Microsoft. Regression lines were drawn, based on which the theoretical time of bacteria survival in the tested material was calculated. The inactivation rate of the indicator bacteria was considerably varied both in particular cycles and in the layers of the composted material. In all the layers of the biomass, faecal streptococci always survived longer than E. coli. In the summer cycle, their inactivation rate was longer from 7 to 27 days, while in the autumn cycle - from 12 to 28 days. Sanitation of the material proceeded faster in the summer cycle - after 28 days Escherichia coli were not found in the carriers. At the same time, the concentration of streptococci decreased by 6 log10 in the top layer and by 7 log10 in the bottom layer. A very slow inactivation rate of the streptococci was observed in the autumn cycle, particularly in the bottom layer. The theoretical survival time was 159 days and was four times longer than that in the top part of the biomass. The research indicated also sanitation activity of such factors as competition, antagonisms or antibiosis during the process of composting.

• Wydawca: -
• Czasopismo: Zeszyty Problemowe Postępów Nauk Rolniczych
• Rocznik: 2015
• Tom: 580
• Opis fizyczny: s.131-139,rys.,tab.,bibliogr.

Twórcy

autor

Szala B.

• Katedra Mikrobiologii i Technologii Żywności, Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy, ul.Bernardyńska 6/8, 85-029 Bydgoszcz

autor

Breza-Boruta B.

• Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy

Bibliografia

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