Portable and Low-Cost Respirometric Microsystem for the Static and Dynamic Respirometry Monitoring of Compost

Bermúdez, J. F. Quant; Saldarriaga, Juan F.; Osma, Johann F.

doi:10.3390/s19194132

Cited by 8 publications

(7 citation statements)

References 48 publications

(67 reference statements)

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“…This trend was also observed in other impact categories considered in this study. Although energy spent in the laser cutting had the highest contribution in the impact assessment, this technology reduced the micromixer manufacturing time compared to other wet chemical etching processes [22]. Also, this technique facilitated maintaining consistent dimensions and the appropriate device functionality due to its resolution and flexibility in terms of the variety of materials that can be handled [23].…”

Section: Life Cycle Impact Assessment Of the Manufacturing Stagementioning

confidence: 99%

Micromixers for Wastewater Treatment and Their Life Cycle Assessment (LCA)

Fuentes¹,

Noguera²,

Peñaranda³

et al. 2021

Advances in Microfluidics and Nanofluids

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The use of micromixers and catalytically active nanocomposites can be an attractive alternative for the treatment of wastewaters from the textile industry, due to their high activity, low consumption of such nanocomposites, short reaction times and the possibility to work under continuous operation. In this study, 6 different designs of micromixers were modeled and evaluated for the treatment of wastewaters. Velocity profiles, pressure drops, and flows were analyzed and compared for the different devices under the same mixing conditions. In addition, Life cycle assessment (LCA) methodology was applied to determine their performance in terms of environmental impact. Considering the high environmental impact of water sources contaminated by dyes from the textile industry, it becomes critically important to determine when the proposed micromixers are a suitable alternative for their remediation. The LCA and operational efficiency studies results shown here provide a route for the design of novel wastewater treatment systems by coupling low-cost and high-performance micromixers.

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Section: Life Cycle Impact Assessment Of the Manufacturing Stagementioning

confidence: 99%

Micromixers for Wastewater Treatment and Their Life Cycle Assessment (LCA)

Fuentes¹,

Noguera²,

Peñaranda³

et al. 2021

Advances in Microfluidics and Nanofluids

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“…Several studies considered oxygen consumption as a reliable variable for evaluating the development of composting due to its correlation with the metabolic potential of compost [6,35,36]. Additionally, oxygen is directly responsible for the oxidation of organic matter [8]. This can be measured through respirometry, a recognized method for measuring the oxygen consumption of microorganisms [37].…”

Section: Determination Of Compost Quality and Its Measurementmentioning

confidence: 99%

“…Composting is a safe method of waste management [6] and has the potential to improve soil structure, texture, and aeration, as well as improve the water retention capacity of the soil [7]. In addition, the Environmental Protection Agency (EPA) of the United States declared that composting reduces methane emissions in landfills, lowering their carbon footprint [8]. Therefore, composting is an environmentally friendly alternative applied to recycle organic waste and obtain products used as amendments in agriculture [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Quality of Backyard Compost and Its Potential Utilization as a Circular Bio-Waste Source

et al. 2021

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The use and quality analysis of household compost have become very important issues in recent years due to the increasing interest in local food production and safe, self-produced food. The phenomenon was further exacerbated by the COVID-19 pandemic quarantine period, which gave new impetus to the growth of small home gardens. However, the knowledge associated with making high-quality compost is often lacking in home gardeners. Therefore, the objective of this research was to find answers to the following questions: can the quality of backyard compost be considered safe in terms of toxicity and nutrient content? Can weed seed dispersion affect the usability of backyard compost? In general, can the circulation of organic matter be increased with the spread of home composting? In this study, 16 different house composts were analysed for stability, weed seed contamination, toxic elements, and nutrient content using analysis of variance. The results of the research showed that the quality properties of the composts (including their weed seed dispersion effect) were greatly influenced by the different techniques and raw materials used. The toxicity levels, as well as the content of macro and microelements, were within the parameters of safe-quality compost. The specific macronutrient (Ca, Mg) and micronutrient (Fe, Mn) contents of the tested composts have a similar and, in some cases, more favorable nutrient supply capacity in crop production than the frequently-used cow manure-based composts. With a plan of basic education on composting, there is potential to encourage farmyard composting.

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“…Many previous studies reported the design of lab-or pilot-scale bioreactors used for composting biomass, whose stability was evaluated by measuring the respirometric index. A first group regards studies where the respirometric tests were performed in a separate equipment, on solid samples periodically withdrawn from the composting piles [18][19][20][21][22], also resorting to portable and low-cost respirometric systems [23].…”

Section: Introductionmentioning

confidence: 99%

Composting Hydrochar-OFMSW Digestate Mixtures: Design of Bioreactors and Preliminary Experimental Results

2021

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An increasing number of industrial plants integrate the anaerobic digestion (AD) of the organic fraction of municipal solid waste (OFMSW) with a subsequent composting phase. To improve the plant productivity, a fraction of OFMSW digestate can be converted into a carbonaceous material, called hydrocar (HC), through Hydrothermal Carbonization (HTC), and then composted together with the OFMSW digestate itself, to produce “hydrochar co-compost”. The aim of this paper is to present the design and assembly of batch bioreactors, built in-house to investigate the co-composting process of OFMSW digestate and its HC, and to provide some preliminary results. The OFMSW digestate from an industrial plant was carbonized at 200 °C for 3 h in a 2 L HTC reactor, to produce wet HC after filtration. The ratio of OFMSW digestate and green waste (1:1) used as bulking medium was reproduced in four bioreactors with an increasing percentage of HC substituting the OFMSW digestate (0, 25, 50, 75%). The bioreactors managed to effectively compost the solid wet biomasses in a wet environment with temperature and oxygen control, while measuring online the oxygen consumption and thus the dynamic respirometric index (DRI). The DRI24,max measured with AIR-nl solid respirometer (standardized offline measurement) started from values above 800 mg O2 kgVS−1 h−1 before composting and dropped at the end of the process to values in the range 124–340 mg O2 kgVS−1 h−1 for the four mixes, well below the recommended limit of 500 mg O2 kgVS−1 h−1 for high-quality compost stability. These offline DRI values were confirmed by the online DRI measurements. This research is part of the international C2Land Project funded by the European Institute of Innovation and Technology Climate Knowledge and Innovation Community (EIT Climate-KIC), which is greatly acknowledged.

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Portable and Low-Cost Respirometric Microsystem for the Static and Dynamic Respirometry Monitoring of Compost

Cited by 8 publications

References 48 publications

Micromixers for Wastewater Treatment and Their Life Cycle Assessment (LCA)

Micromixers for Wastewater Treatment and Their Life Cycle Assessment (LCA)

Analysis of Quality of Backyard Compost and Its Potential Utilization as a Circular Bio-Waste Source

Composting Hydrochar-OFMSW Digestate Mixtures: Design of Bioreactors and Preliminary Experimental Results

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