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Water Practice & Technology © IWA Publishing 2006 |
doi10.2166/wpt.2006.074
An implementation of the hybrid respirometric measurement principle with more reliable oxygen uptake rate (OUR) measurement
Peili Lu1, Daijun Zhang1,2, Xin Zhang1, Haibin Cao1
1Department of Environmental Science, Campus A, Chongqing University, Chongqing, 400030, China
2Key Lab for the Exploitation of South-Western Resources & the Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing, 400030, China
ABSTRACT
The aim of this paper is to realize fully the hybrid respirometric measurement principle with high accuracy and measuring frequency. Based on the knowledge of the difficulty in implementing "ultimate" hybrid respirometer and the drawbacks of the simpler hybrid respirometer, a novel implementation of the hybrid respirometric measurement principle was developed. It was verified that the new hybrid respirometer possessed the advantage of "ultimate" hybrid respirometer while its DO electrodes suffered no effect of flow rate change. Also the accurate and constant temperature of the whole set-up was solved. For the purpose of enhancing the availability of the respirometer proposed in this paper, software with friendly user interface was developed, in which advanced arithmetic and median filter were adopted. Finally the new hybrid respirometer system was evaluated and the accuracy and reliability were satisfied.
Keywords: Development, Filter, Hybrid respirometric measurement principle, Respirometer, Software
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