Near-infrared spectroscopy (NIRS) for a real time monitoring of the biogas process

Stockl, Andrea; Lichti, Fabian

doi:10.1016/j.biortech.2017.09.173

Cited by 41 publications

(11 citation statements)

References 18 publications

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“…Nowadays, FTIR techniques are becoming widespread in monitoring wastewater treatment processes. Several parameters can be measured with this technique as alcohols and volatile organic acids (Nespeca et al, 2017), biogas production (Stockl and Lichti, 2018), biochemical oxygen demand, chemical oxygen demand (COD), turbidity, total organic carbon (TOC) and volatile fatty acids (VFA), among others (Mesquita et al, 2017). On the other hand, the quantification of pharmaceuticals, and other emerging pollutants, in wastewaters by FTIR and chemometrics is just starting to have the attention of the scientific community (Quintelas et al, 2019).…”

Section: Remarks and Perspectivementioning

confidence: 99%

Environmentally-friendly technology for rapid identification and quantification of emerging pollutants from wastewater using infrared spectroscopy

Quintelas

Melo

Costa

et al. 2020

Environmental Toxicology and Pharmacology

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The monitoring of emerging pollutants in wastewaters is nowadays an issue of special concern, with the classical quantification methods being time and reagent consuming. In this sense, a FTIR transmission spectroscopy based chemometric methodology was developed for the determination of eight of these pollutants. A total of 456 samples were, therefore, obtained, from an activated sludge wastewater treatment process spiked with the studied pollutants, and analysed in the range of 200 cm −1 to 14,000 cm −1. Then, a k-nearest neighbour (kNN) analysis aiming at identifying each sample pollutant was employed. Next, partial least squares (PLS) and ordinary least squares (OLS) modelling approaches were employed in order to obtain suitable prediction models. This procedure resulted in good prediction abilities regarding the estimation of atrazine, desloratadine, paracetamol, β-estradiol, ibuprofen, carbamazepine, sulfamethoxazole and ethynylestradiol concentrations in wastewaters. These promising results suggest this technology as a fast, eco-friendly and reagent free alternative methodology for the quantification of emerging pollutants in wastewaters.

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Section: Remarks and Perspectivementioning

confidence: 99%

Environmentally-friendly technology for rapid identification and quantification of emerging pollutants from wastewater using infrared spectroscopy

Quintelas

Melo

Costa

et al. 2020

Environmental Toxicology and Pharmacology

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“…Several electrochemical, chromatographic and spectroscopic devices (UV, VIS, IR/NIRS) can be used for on-line monitoring in order to generate early warning signals and permit specific actions of correction. Among them, the most promising method is NIRS spectroscopy because a large number of parameters can be measured at the same time [30]. However, in the case of small plants (i.e., below 100 kW) this method is still too expensive.…”

Section: Monitoring and Control Of Plant Efficiencymentioning

confidence: 99%

Recent Updates on the Use of Agro-Food Waste for Biogas Production

et al. 2019

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The production of biogas from anaerobic digestion (AD) of residual agro-food biomasses represents an opportunity for alternative production of energy from renewable sources, according to the European Union legislation on renewable energy. This review provides an overview of the various aspects involved in this process with a focus on the best process conditions to be used for AD-based biogas production from residual agro-food biomasses. After a schematic description of the AD phases, the biogas plants with advanced technologies were described, pointing out the strengths and the weaknesses of the different digester technologies and indicating the main parameters and operating conditions to be monitored. Subsequently, a brief analysis of the factors affecting methane yield from manure AD was conducted and the AD of fruit and vegetables waste was examined. Particular attention was given to studies on co-digestion and pre-treatments as strategies to improve biogas yield. Finally, the selection of specific microorganisms and the genetic manipulation of anaerobic bacteria to speed up the AD process was illustrated. The open challenges concern the achievement of the highest renewable energy yields reusing agro-food waste with the lowest environmental impact and an increment of competitiveness of the agricultural sector in the perspective of a circular economy.

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“…However, because of the electronic structures needed to be applied, laser is quite expensive rather than the LED, it might not be a better option to use lasers in some applications especially in real-time and clinical applications where a restricted budget has been dedicated. 34,[37][38][39][40] The technology of the secondary optics including the lenses and reflectors have come to help us in this regard so that they have been applied into LED hardware configuration in order to magnify the intensity of the light towards the desired target. 41,42 To our best knowledge, there is a gap in studies of light focus in spectroscopic applications, especially for the human brain.…”

Section: Introductionmentioning

confidence: 99%

Simulation and in vivo investigation of light-emitting diode, near infrared Gaussian beam profiles

Mirbagheri

Hakimi

Ebrahimzadeh

et al. 2019

Journal of Near Infrared Spectroscopy

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Near infrared spectroscopy is an optical imaging technique which offers a non-invasive, portable, and low-cost method for continuously measuring the oxygenation of tissues. In particular, it can provide the brain activation through measuring the blood oxygenation and blood volume in the cortex. Understanding and then improving the spatial and depth sensitivity of near infrared spectroscopy measurements to brain tissue are essential for designing experiments as well as interpreting research findings. In this study, we investigate the effect of applying two common light beam profiles including Uniform and Gaussian on the penetration depth of an LED-based near infrared spectroscopy. In this regard, two Gaussian profiles were produced by adjusting plano-convex and bi-convex lenses and the Uniform profile was provided by applying a flat lens. Two experiments were conducted in this study. First, a simulation experiment was carried out based on scanning the intra space of a liquid phantom by using static and pulsating absorbers to compare the penetration depth of the configurations applied on the LED-based near infrared spectroscopy with that of a laser-based near infrared spectroscopy. Second, to show the feasibility of the best proposed configuration applied, an in vivo experiment of stress assessment has been performed and its results have been compared with that results obtained by laser one. The results showed that the LED-based near infrared spectroscopy equipped with bi-convex lens provides a penetration depth and hence quality measurements of near infrared spectroscopy and its extracted heart rate variability signals as well as laser-based near infrared spectroscopy especially in the application of stress assessment.

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Near-infrared spectroscopy (NIRS) for a real time monitoring of the biogas process

Cited by 41 publications

References 18 publications

Environmentally-friendly technology for rapid identification and quantification of emerging pollutants from wastewater using infrared spectroscopy

Environmentally-friendly technology for rapid identification and quantification of emerging pollutants from wastewater using infrared spectroscopy

Recent Updates on the Use of Agro-Food Waste for Biogas Production

Simulation and in vivo investigation of light-emitting diode, near infrared Gaussian beam profiles

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