Application of a modified OxiTop® respirometer for laboratory composting studies

• Autorzy: Malińska K.

Identyfikatory

DOI

10.1515/aep-2016-0007

Warianty tytułu

PL

Wykorzystanie zmodyfikowanego systemu OxiTop® do laboratoryjnych badań procesu kompostowania

• Języki publikacji: EN

Abstrakty

EN

This study applied a modified OxiTop® system to determine the oxygen uptake rate during a 2-day respiration test of selected composting materials at different moisture contents, air-filled porosities and composition of composting mixtures. The modification of the OxiTop® respirometer included replacement and adjustment of a glass vessel (i.e. a 1.9-L glass vessel with wide mouth was used instead of a standard 1-L glass bottle, additionally the twist-off vessel lid was adjusted to attach the measuring head) and application of a closed steel mesh cylinder of 5 cm in diameter and 10 cm in height with the open surface area of the mesh of approximately 56.2%. This modification allowed obtaining different bulk densities (and thus air-porosities) of the investigated composting materials in laboratory composting studies. The test was performed for apple pomace and composting mixtures of apple pomace with wood chips at ratios of 1:0.5, 1:1, 1:1.5 (d.w), moisture contents of 60%, 65% and 75% and air-filled porosities ranging from 46% to 1%. Due to diverse biodegradability of the investigated apple pomace and composting mixtures this test allows for the determination of the effects of different air-porosities (due to compaction in a pile) on the oxygen uptake rate for mixtures with a fixed ratio of a bulking agent. The described method allows for laboratory determination of the effects of moisture content and compaction on biodegradation dynamics during composting.

PL

W przedstawionych badaniach wykorzystano zmodyfikowany system OxiTop® do wyznaczenia szybkości oddychania w oparciu o zużycie tlenu podczas 2-dniowego testu respirometrycznego dla wybranych materiałów przeznaczonych do kompostowania o różnym składzie mieszanek, zawartości wody i porowatości. Modyfikacja systemu OxiTop® dotyczyła dostosowania szklanego naczynia oraz jego wyposażenie w cylinder w kształcie walca o średnicy 5 cm i wysokości 10 cm, wykonanego z siatki stalowej (oczka siatki stanowiły ok. 56,2% całkowitej powierzchni). Ta modyfikacja pozwoliła na uzyskiwanie różnych gęstości nasypowych (a tym samym porowatości) badanych materiałów w skali laboratoryjnej. Test respirometryczny został przeprowadzony dla wytłoków jabłkowych i mieszanek wytłoków jabłkowych i ścinek drzewnych w stosunku 1:0,5, 1:1, 1:1,5 (s.m) i zawartości wody 60%, 65% i 75% oraz porowatości w zakresie od ok. 46% do ok. 1%. Z uwagi na różną podatność badanych mieszanek na biodegradację, możliwe było określenie wpływu zmian porowatości powietrznej (spowodowanych kompakcją) na szybkość zużycia tlenu dla mieszanki o stałym udziale czynnika strukturotwórczego. Przedstawiona metoda pozwala na laboratoryjne badanie wypływu zawartości wody i kompakcji na biodegradację podczas kompostowania.

Słowa kluczowe

EN

respiration tests; oxygen respiration rate; pressure drop method; OxiTop® respirometer; composting; biodegradation

PL

test oddychania; test respirometryczny; szybkość oddychania tlenem; metoda spadku ciśnienia; system OxiTop®; kompostowanie; biodegradacja

• Wydawca: Institute of Environmental Engineering, Polish Academy of Sciences
• Czasopismo: Archives of Environmental Protection
• Rocznik: 2016
• Tom: Vol. 42, no. 1
• Strony: 56--62
• Opis fizyczny: Bibliogr. 33 poz., tab., wykr.

Twórcy

autor

Malińska K.

• Czestochowa University of Technology, Poland Faculty of Environmental Engineering and Biotechnology Institute of Environmental Engineering

Bibliografia

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