María C. Veiga

Universidade da Coruña

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Christian Kennes

Universidade da Coruña

202

Eldon R. Rene

IHE Delft Institute for Water Education

Haris Nalakath Abubackar

Universidade da Coruña

M. Eiroa

Universidade da Coruña

Yaomin Jin

Purdue University West Lafayette

M. Estefanía López

IHE Delft Institute for Water Education

Carlos Peinador

Universidade da Coruña

Carla Fernández‐Blanco

Universidade da Coruña

José M. Quintela

Universidade da Coruña

Raúl Robles‐Iglesias

Universidade da Coruña

Cooperative Institutions

Universidade da Coruña

Universidade de Santiago de Compostela

RELX Group (Netherlands)

Shiraz University

Universidade de Vigo

Instituto Politécnico Nacional

Universidade de São Paulo

Centre National de la Recherche Scientifique

University of Minho

Chinese Academy of Sciences

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Cheese whey fermentation into volatile fatty acids in an anaerobic sequencing batch reactor

Bioresource Technology (2020)

Borja Lagoa‐Costa Christian Kennes María C. Veiga

Acidogenesis

Sequencing batch reactor

Hydraulic retention time

Volatile fatty acids

10.1016/j.biortech.2020.123226

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Citations (55)

ChemInform Abstract: Synthesis of New Pyridazino(4′,3′:4,5)thieno(3,2-d)-1,2,3-triazine and Pyrimido(4′,5′:4,5)thieno(2,3-c)pyridazine Derivatives.

ChemInform (1997)

José M. Quintela María C. Veiga Rafael Alvarez-Sarandés L. González Carlos Peinador

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Pyridazine

Triazine

10.1002/chin.199712151

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Hydrothermal extraction of ulvans from Ulva spp. in a biorefinery approach

The Science of The Total Environment (2024)

Pablo Rodríguez-Iglesias Kai L Baltrusch Beatriz Díaz-Reinoso Miriam López‐Álvarez Ramón Novoa-Carballal

A simple cascade process based on the hydrothermal fractionation of Ulva spp. biomass was proposed. Considering the overall extraction yields (50 %), ulvan recovery (23 %), and ulvan composition, structural, mechanical and cytotoxic properties, the selected optimal final heating temperature was 160 °C. Ethanol precipitation provided the highest ulvan recovery yields but choline chloride precipitated ulvans showed stronger mechanical properties, G´ moduli 1.5·104 Pa and 3·104 Pa for ethanol and for choline chloride, respectively. Both products were safe on NCTC 929 mouse fibroblasts and after a cooling stage, formed films without requiring any additives. From the ulvan-free liquid fraction, one product with 43 % (wt, d.b.) phenolics and moderate antiradical properties and a byproduct containing nutrients and minerals were separated. The methane potential of the corresponding residual solids was influenced by the hydrothermal heating temperature and was doubled compared to than for the untreated seaweed biomass (60 mL/g VS). This scheme could be also applied to the wet algal biomass, in a chemical free alternative to provide ready to use ulvan biopolymers, bioactives, nutrients, salts and biogas, conforming a biorefinery approach.

Ethanol precipitation

10.1016/j.scitotenv.2024.175654

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Emisiones de gases de efecto invernadero desde los sistemas de saneamiento

María C. Veiga Christian Kennes

Source

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Effect of pH and medium composition on chain elongation with Megasphaera hexanoica producing C4-C8 fatty acids

Frontiers in Microbiology (2023)

Carla Fernández‐Blanco María C. Veiga Christian Kennes

Chain elongation technology, which involves fermentation with anaerobic bacteria, has gained attention for converting short and medium chain substrates into valuable and longer-chain products like medium chain fatty acids (MCFAs). In the recent past, the focus of studies with pure chain elongating cultures was on species of other genera, mainly Clostridium kluyveri. Recently, other chain elongators have been isolated that deserve further research, such as Megasphaera hexanoica.In this study, batch studies were performed in bottles with two different media to establish the optimal conditions for growth of M. hexanoica: (a) a medium rich in different sources of nitrogen and (b) a medium whose only source of nitrogen is yeast extract. Also, batch bioreactor studies at pH values of 5.8, 6.5 and 7.2 were set up to study the fermentation of lactate (i.e., electron donor) and acetate (i.e., electron acceptor) by M. hexanoica.Batch bottle studies revealed the yeast extract (YE) containing medium as the most promising in terms of production/cost ratio, producing n-caproate rapidly up to 2.62 ± 0.24 g/L. Subsequent bioreactor experiments at pH 5.8, 6.5, and 7.2 confirmed consistent production profiles, yielding C4-C8 fatty acids. A fourth bioreactor experiment at pH 6.5 and doubling both lactate and acetate concentrations enhanced MCFA production, resulting in 3.7 g/L n-caproate and 1.5 g/L n-caprylate. H2 and CO2 production was observed in all fermentations, being especially high under the increased substrate conditions. Overall, this study provides insights into M. hexanoica's behavior in lactate-based chain elongation and highlights optimization potential for improved productivity.

Yeast extract

Growth medium

10.3389/fmicb.2023.1281103

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Citations (3)

Valorisation of food wastes through acidogenic fermentation

Journal of Bioremediation & Biodegradation (2016)

María C. Veiga

Valorisation

Acidogenesis

Food Waste

10.4172/2155-6199.c1.003

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Effect of phenol on the biological treatment of wastewaters from a resin producing industry

Bioresource Technology (2007)

M. Eiroa José A. Vilar Christian Kennes María C. Veiga

Kjeldahl method

10.1016/j.biortech.2007.07.045

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Citations (19)

Effects of pH, CO2, and flow pattern on the autotrophic degradation of hydrogen sulfide in a biotrickling filter

Biotechnology and Bioengineering (2005)

Yaomin Jin María C. Veiga Christian Kennes

In this study, the effects of pH, CO2, and flow pattern on the performance of a biotrickling filter (BTF) packed with plastic Pall rings and treating a H2S-polluted waste gas were investigated to establish the optimum operating conditions and design criteria. The CO2 concentration had no effect on the biodegradation at H2S concentrations below 50 ppm. In the range of 50–127 ppm H2S, CO2 concentrations between 865 and 1,087 ppm enhanced H2S removal, while higher concentrations of 1,309–4,009 ppm CO2 slightly inhibited H2S removal. The co-current flow BTF presented the advantage of a more uniform H2S removal and biomass growth in each section than the counter-current flow BTF. Examination of the pH-effect in the range of pH 2.00–7.00 revealed optimal activity for autotrophs at pH 6.00. Under optimal conditions, the elimination capacity reached 31.12 g H2S/m3/h with a removal efficiency exceeding 97%. In the present research, autotrophic biomass was developed in the BTF, performing both a partial oxidization of H2S to elemental sulfur and a complete oxidization to sulfate, which is favorable from an environmental point of view. Results showed that around 60% of the sulfide concentration fed to the reactor was transformed into sulfate. Such autotrophic trickling filters may present other advantages, including the fact that they do not release any CO2 to the atmosphere. Besides, the limited growth of autotrophs avoids potential clogging problems. Experimental performance data were compared with data from a mathematical model. Comparisons showed that the theoretical model was successful in predicting the performance of the biotrickling filter. Copyright © 2005 Wiley Periodicals, Inc.

Autotroph

Trickling filter

Degradation

10.1002/bit.20607

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Citations (69)

Biogas

Marta Ben Christian Kennes María C. Veiga

10.1002/9781118523360.ch14

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Performance optimization of the fungal biodegradation of α-pinene in gas-phase biofilter