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Improved Precision and Efficiency of a Modified ORG0020 Dynamic Respiration Test Setup for Compost Stability Assessment

Guillen Ferrari, Diana; Howell, Graham and Aspray, Thomas J. (2017). Improved Precision and Efficiency of a Modified ORG0020 Dynamic Respiration Test Setup for Compost Stability Assessment. Sustainability, 9(12), article no. 2358.

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The ORG0020 dynamic respiration test is effective at distinguishing source segregated organic waste derived composts across a wide range of stabilities when compared to other standard tests; however, using the original diaphragm pump and manifold setup, the test is affected by variability in flow rate with time and across sample replicate vessels. Here, we demonstrate the use of a multichannel peristaltic pump to deliver a more consistent air flow to individual vessels. Using finished and unfinished industry compost samples from different sites with varying stabilities, we provide evidence of greater precision of the modified setup compared to the original. Furthermore, the reduced need for air flow adjustment resulted in improved running cost efficiency with less labour demand. Analysis of compost sample oxygen demand supports the current test air flow rate of 25–75 mL min−1, although the improved air flow control will enable future narrowing of the acceptable range for better inter-laboratory performance.

Item Type: Journal Item
Copyright Holders: 2017 The Authors
ISSN: 2071-1050
Keywords: compost stability; dynamic; respiration; carbon dioxide; compost quality; running cost analysis
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 52818
Depositing User: Graham Howell
Date Deposited: 08 Jan 2018 09:45
Last Modified: 05 May 2019 00:06
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