期刊
BIOSENSORS & BIOELECTRONICS
卷 14, 期 12, 页码 883-893出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/S0956-5663(99)00064-0
关键词
BOD sensor; biochemical oxygen demand; activated sludge; microbial consortium; kinetic mode; dynamic mode; wastewater
A biochemical oxygen demand (BOD) sensor, based on an immobilised mixed culture of microorganisms in combination with a dissolved oxygen electrode, has been developed for the purpose of on-line monitoring of the biological treatment process for waste and wastewater. The sensor was designed for easy replacement of the biomembrane, thereby making it suitable for short-term use. The drawbacks of activated sludge based sensor, such as short sensor lifetime, were thereby circumvented. The sensor BOD measurements were carried out in the kinetic mode using a flow injection system, resulting in 25 s for one measurement followed by 4-8 min recovery time. Based on the results of normalised sensor responses, the OECD synthetic wastewater was considered to be a more suitable calibration solution in comparison with the GGA solution. Good agreement was achieved between the results of the sensor BOD measurement and those obtained from BOD, analysis of a wastewater sample from a food-processing factory. Reproducibility of responses using one sensor was below +/- 5.6% standard deviation. Reproducibility of responses using different sensors was within acceptable bias limits, viz. +/- 15% standard deviation. (C) 2000 Elsevier Science S.A. All rights reserved.
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