A MEMS approach to determine the biochemical oxygen demand (BOD) of wastewaters

Recoules, Loic; Migaou, Amani; Dollat, Xavier; Thouand, Gérald; Gué, Anne Marie; Boukabache, Ali

doi:10.1088/1361-6439/aa710e

Cited by 4 publications

(5 citation statements)

References 18 publications

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“…For example, oxygen optodes have already been used in oceanography for measurements of community respiration rates in the mesopelagic and surface waters of the oligotrophic open ocean (48)(49)(50). They have also been used for measuring BOD in wastewater (55,56). Here, we propose a novel, modern BOD method using oxygen optodes instead of the traditional Winkler titration for the measurement of dissolved oxygen concentration [O 2 ] in the BOD bottles.…”

Section: Proposed New Technique For Bod Determinationmentioning

confidence: 99%

Correcting a major error in assessing organic carbon pollution in natural waters

et al. 2021

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Microbial degradation of dissolved organic carbon (DOC) in aquatic environments can cause oxygen depletion, water acidification, and CO2 emissions. These problems are caused by labile DOC (LDOC) and not refractory DOC (RDOC) that resists degradation and is thus a carbon sink. For nearly a century, chemical oxygen demand (COD) has been widely used for assessment of organic pollution in aquatic systems. Here, we show through a multicountry survey and experimental studies that COD is not an appropriate proxy of microbial degradability of organic matter because it oxidizes both LDOC and RDOC, and the latter contributes up to 90% of DOC in high-latitude forested areas. Hence, COD measurements do not provide appropriate scientific information on organic pollution in natural waters and can mislead environmental policies. We propose the replacement of the COD method with an optode-based biological oxygen demand method to accurately and efficiently assess organic pollution in natural aquatic environments.

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Section: Proposed New Technique For Bod Determinationmentioning

confidence: 99%

Correcting a major error in assessing organic carbon pollution in natural waters

et al. 2021

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“…Based on a PDMS/Glass technology [8], we have designed and fabricated chips having five wells to test different bacteria strains or, for a given bacteria, different nutrients concentrations [3]. Each of these micro chambers is equipped with optical sensor 'optod' whose fluorescence intensity changes with the quantity of oxygen present in the water sample [3].…”

Section: Bod Principles and Microsystem Chipmentioning

confidence: 99%

“…Knowing that the PDMS is partially permeable to gas [3], we have coated the walls of the micro-chambers with a SU8 polymer film.…”

Section: Bod Principles and Microsystem Chipmentioning

confidence: 99%

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Towards a Miniaturized Device to Evaluate the BOD Parameter of Wastwater

Recoules

Jouanneau

Thouand

et al. 2019

IJESD

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The concentration of organic pollutants present in wastewater is classically evaluated by measuring the quantity of dissolved oxygen during five days; it is quantified by the so called BOD5 parameter (Biological Oxygen Demand). This work constitutes the first step of an overall strategy targeting to improve the monitoring of this indicator of the water quality. We focus on the development of a microsystem approach allowing monitoring the O 2 consumption induced by the biodegradation process of organic matter. To evaluate the organic pollutants concentration, we use Escherichia coli as bacterial indicator, confined in a PDMS-glass chip. Their metabolic activity in presence of organic molecules is deduced from their oxygen consumption. These measurements are ensured by optical sensors present in each of the five instrumented chambers of the chip. The results show that the microsystem approach is suitable to measure simultaneously different concentrations of organic load, and that it is possible to reduce the analysis time. By examining the O 2 diffusion towards the walls of the device, we analyze the different part of the experimental results; it allows, on the basis of a theoretical model, to predict a precise evaluation of the BOD value within few hours.

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“…Similar to the monitoring the acute water toxicity, the miniaturization of the BOD system was another active field for the rapid BOD determination. − For example, Torrents et al constructed microfluidic respirometer for the continuous determination of short time BOD with a flow cell separated by a thin oxygen permeable membrane from a bioreactor and simulated the effect of membrane material and thickness on oxygen supply rate …”

Section: Environmentmentioning

confidence: 99%

Tackling Grand Challenges of the 21st Century with Electroanalytical Chemistry

Peng

Wang

2018

J. Am. Chem. Soc.

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Modern electroanalytical chemistry, based on an intimate coupling of electrochemical techniques and spectroscopic and imaging methodologies, contains a broad range of very powerful research tools that are invariably characterized by descriptors of in situ, in vivo, real-time, online, etc. This Perspective offers a viewpoint of the authors on part of the grand challenges facing society and our planet in the 21st century, where contemporary analysts, armed with modern electroanalytical chemistry, have the ability to tackle these challenges with unprecedented levels. Prominent research topics such as energy, environment and biology are highlighted to manifest the capability and indispensability of modern electroanalytical chemistry when addressing these pressing challenges and beyond.

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A MEMS approach to determine the biochemical oxygen demand (BOD) of wastewaters

Cited by 4 publications

References 18 publications

Correcting a major error in assessing organic carbon pollution in natural waters

Correcting a major error in assessing organic carbon pollution in natural waters

Towards a Miniaturized Device to Evaluate the BOD Parameter of Wastwater

Tackling Grand Challenges of the 21st Century with Electroanalytical Chemistry

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