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- W2010402042 abstract "Compost stability is one of the most important criteria used to evaluate compost quality.Several of the most popular methods to quantify stability are based on measurements of aerobicrespiration of oxygen to carbon dioxide. This study compared two closed-vessel respirationtechniques. In both methods, the evolved CO2 was absorbed by sodium hydroxide (NaOH), leadingto a pressure drop in the container. The conventional technique measures absorbed CO2 by titratingthe NaOH trap, limiting measurement frequency by the need to manually remove and replace thetrap. The pressure sensor method (PSM) uses a datalogger to record pressure differences in thevessel, allowing several observations each hour. Samples of bedded swine manure compost(n=125) were analyzed using both the PSM and the titration method (TM). Each compost sample was also analyzed for total solids, volatile solids (VS), pH and electrical conductivity. Respirationresults obtained using the PSM were compared with those obtained using the TM, with each methodrun on split compost samples under the same environmental conditions. Respiration rates measuredby PSM and TM were highly correlated (R2 = 0.92). Respiration rates ranged from 3.64 to 10.77 mgCO2-C gVS-1 d-1, varying with feedstock and the extent of prior composting. Decreases in volatilesolids and/or increases in composting time resulted in decreases in the respiration rate, but the effectof pH and electrical conductivity was not clear. For the PSM, detailed time series data also alloweddynamic observation of important changes in the respiration rate throughout the course of incubation.PSM is a sensitive and reliable method to quantify compost respiration and stability." @default.
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- W2010402042 date "2004-01-01" @default.
- W2010402042 modified "2023-09-26" @default.
- W2010402042 title "Determination of Compost Respiration Rates Using Pressure Sensors" @default.
- W2010402042 doi "https://doi.org/10.13031/2013.17011" @default.
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