Role of waste-based geopolymer spheres addition for pH control and efficiency enhancement of anaerobic digestion process

Gameiro, Tânia; Novais, Rui M.; Correia, Catarina L.; Carvalheiras, João; Seabra, M.P.; Tarelho, L.A.C.; Labrincha, J.A.; Capela, Isabel

doi:10.1007/s00449-021-02522-w

Cited by 6 publications

(6 citation statements)

References 44 publications

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“…The authors also tested the performance of high porosity geopolymer spheres comparatively to the addition of alkaline chemicals for pH control. Once again, the spheres presented very good anaerobic performance after four cycles, with an improvement in methane yield produced of 25% (Gameiro et al, 2021).…”

Section: Ph Bufferingmentioning

confidence: 84%

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Review of recycling alternatives for paper pulp wastes

Vilarinho

Gameiro²,

Capela³

et al. 2022

Front. Mater.

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The demand for products derived from the pulp and paper industry has been increasing over the past years and is projected to further increase over the coming decades. Although being one of Portugal’s most relevant industrial activities, contributing to nearly 2.3% of the GDP, this sector is known to generate a variety of wastes including fly ashes, exhausted bed sands, green liquor dregs, grits, lime muds, biological and pulp and paper mill sludges, which have been mostly disposed of in landfills. This strategy is not aligned with the circular economy vision, and therefore it is imperative to develop new recycling routes for the different waste streams. This scenario has driven a significant research effort in the attempt to design sustainable recycling alternatives for the distinct wastes. This study summarizes the investigations focusing on the valorisation of these wastes in a wide range of applications, including the production of low carbon footprint binders or mortars for the construction sector, but also the production of novel materials for high added-value applications such as wastewater treatment and pH regulation. The present work also highlights the main bottlenecks and future prospects for the studied wastes.

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Section: Ph Bufferingmentioning

confidence: 84%

“…The influence of the sphere's porosity in long-term methane production from cheese whey by an anaerobic system was studied by Gameiro et al (2019Gameiro et al ( , 2021. The authors tested two anaerobic cycles, to evaluate the spheres' capacity to continuously regulate the pH, even in stressful environmental conditions.…”

Section: Ph Bufferingmentioning

confidence: 99%

Review of recycling alternatives for paper pulp wastes

Vilarinho

Gameiro²,

Capela³

et al. 2022

Front. Mater.

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“…Regarding research that has been developed about the use of CW and its connections to the principles of the CE, it was found that only eight articles have been published during the period under consideration [9,16,[41][42][43]. Of these publications, seven are from Europe (Spain, Greece, Ireland, Italy, Portugal, the United Kingdom, and the Czech Republic) and one from Oceania (Australia).…”

Section: Geographical Location Of the Studies And Its Evolution Over ...mentioning

confidence: 99%

“…It is observed that the author Rodrigues J.A.D., Ratusznei, S.M., Lovato, G., and Albanez, R. are the ones who hav Studies related to CW anaerobic degradation, from the perspective of the CE, appeared for the first time in 2017 [41]. However, it was only in 2020 when the largest number of publications appeared [9,16,42,43,48]. This finding allows the inference that the subject has not been extensively studied, which represents an opportunity for research in the context of Latin America and especially in countries such as Colombia, with a long tradition of dairy industries.…”

Section: Author and Word Co-occurrence Top Journals Main Articles And...mentioning

confidence: 99%

“…For their part, Gameiro et al [43] developed a CW AD process where they introduced inorganic polymer spheres based on red mud to regulate the pH. The researchers found that the spheres not only buffered the pH, but also increased the methane yield (90%), making it possible to substitute typical alkalinizers, that is, virgin raw materials, showing different alternatives for the application of CE.…”

Section: Advances In the Inclusion Of Ce In The Biological Use By Ad/...mentioning

confidence: 99%

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Opportunities for Waste to Energy in the Milk Production Industry: Perspectives for the Circular Economy

et al. 2021

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Cheese whey is a waste produced in the dairy industry which generates problems if it is dumped directly into the sewer due to its high organic load. An alternative for cheese whey management is anaerobic digestion, a biological process that transforms organic matter into biogas and digestate, two products with significant energy and agricultural potential. This work was aimed at contributing to the building of knowledge about the anaerobic degradation of cheese whey, developing a bibliometric analysis, and tracing trends in related research from 2010 up to the present, using PRISMA® to develop a systematic review based on Scopus® and using Excel® and bibliometric software (VosViewer® and RefViz®) for the identification of information. Our results show that the research around cheese whey is relatively recent and that the highest percentage of publications is from 2018 onwards. Twelve variables of the anaerobic cheese whey degradation process were identified and grouped into five factors: substrate, reactor configuration, digestate analysis, microbiological analysis, and inoculum. Likewise, it was identified that most of the anaerobic processes allow the implementation of the circular economy into the dairy sector. In conclusion, the application of anaerobic digestion in the dairy sector can help to close the productive cycles, produce biofuels, and reduce pollution.

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