Fecal Malodor Detection Using Low-Cost Electrochemical Sensors
| Autor: | Sonia Grego, Siddharth Kawadiya, Marc A. Deshusses, Claire M. Welling |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
electronic nose
010504 meteorology & atmospheric sciences odor 010501 environmental sciences lcsh:Chemical technology 01 natural sciences Biochemistry Article Analytical Chemistry Unmet needs Feces Ammonia Humans lcsh:TP1-1185 Hydrogen Sulfide Sanitation Electrical and Electronic Engineering Technology innovation Instrumentation 0105 earth and related environmental sciences malodor Electronic nose Electrochemical Techniques Pulp and paper industry Atomic and Molecular Physics and Optics Odor Odorants low-cost sensors Environmental science psychological phenomena and processes |
| Zdroj: | Sensors (Basel, Switzerland) Sensors, Vol 20, Iss 2888, p 2888 (2020) Sensors Volume 20 Issue 10 |
| ISSN: | 1424-8220 |
| DOI: | 10.3390/s20102888 |
| Popis: | Technology innovation in sanitation is needed for the 4.2 billion people worldwide, lacking safely managed sanitation services. A major requirement for the adoption of these technologies is the management of malodor around toilet and treatment systems. There is an unmet need for a low-cost instrumented technology for detecting the onset of sanitation malodor and triggering corrective actions. This study combines sensory data with low-cost gas sensor data on malodor emanating from feces. The response of 10 commercial electrochemical gas sensors was collected alongside olfactometric measurements. Odor from fecal specimens at different relevant dilution as well as specimens with pleasant odors as a control were evaluated for a total of 64 responses. Several of the sensors responded positively to the fecal odor, with the formaldehyde, hydrogen sulfide, and ammonia sensors featuring the highest signal to noise ratio. A positive trend was observed between the sensors&rsquo responses and the concentration of the odorant and with odor intensity, but no clear correspondence with dilution to threshold (D/T) values was found. Selected sensors were responsive both above and below the intensity values used as the cutoff for offensive odor, suggesting the possibility of using those sensors to differentiate odor offensiveness based just on the magnitude of their response. The specificity of the sensors suggested that discrimination between the selected non-fecal and fecal odors was possible. This study demonstrates that some of the evaluated sensors could be used to assemble a low-cost malodor warning system. |
| Databáze: | OpenAIRE |
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