|   | 
Details
   web
Records
Author Alejo, L.; Atkinson, J.; Guzman-Fierro, V.; Roeckel, M.
Title Effluent composition prediction of a two-stage anaerobic digestion process: machine learning and stoichiometry techniques Type
Year 2018 Publication Environmental Science And Pollution Research Abbreviated Journal Environ. Sci. Pollut. Res.
Volume 25 Issue 21 Pages 21149-21163
Keywords Anaerobic digestion; Protein degradation; Machine learning; Prediction methods; Support vector machines
Abstract Computational self-adapting methods (Support Vector Machines, SVM) are compared with an analytical method in effluent composition prediction of a two-stage anaerobic digestion (AD) process. Experimental data for the AD of poultry manure were used. The analytical method considers the protein as the only source of ammonia production in AD after degradation. Total ammonia nitrogen (TAN), total solids (TS), chemical oxygen demand (COD), and total volatile solids (TVS) were measured in the influent and effluent of the process. The TAN concentration in the effluent was predicted, this being the most inhibiting and polluting compound in AD. Despite the limited data available, the SVM-based model outperformed the analytical method for the TAN prediction, achieving a relative average error of 15.2% against 43% for the analytical method. Moreover, SVM showed higher prediction accuracy in comparison with Artificial Neural Networks. This result reveals the future promise of SVM for prediction in non-linear and dynamic AD processes.
Address [Alejo, Luz; Guzman-Fierro, Victor; Roeckel, Marlene] Univ Concepcion, Dept Ingn Quim, Victor Lamas 1290,Casilla 160-C Correo 3., Concepcion, Chile, Email: john.atkinson@uai.cl;
Corporate Author Thesis
Publisher Springer Heidelberg Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0944-1344 ISBN Medium
Area Expedition Conference
Notes WOS:000438830900080 Approved
Call Number UAI @ eduardo.moreno @ Serial 890
Permanent link to this record
 

 
Author Cordova, S.; Canizares, C.; Lorca, A.; Olivares, D.E.
Title An Energy Management System With Short-Term Fluctuation Reserves and Battery Degradation for Isolated Microgrids Type
Year 2021 Publication IEEE Transactions on Smart Grid Abbreviated Journal IEEE Trans. Smart Grid
Volume 12 Issue 6 Pages 4668-4680
Keywords Batteries; Computational modeling; Degradation; Energy management; Microgrids; Generators; Regulation; Energy management system; short-term fluctuations; battery degradation; frequency regulation; microgrid operation
Abstract Due to the low-inertia and significant renewable generation variability in isolated microgrids, short time-scale fluctuations in the order of seconds can have a large impact on a microgrid's frequency regulation performance. In this context, the present paper presents a mathematical model for an Energy Management System (EMS) that takes into account the operational impact of the short-term fluctuations stemming from renewable generation rapid changes, and the role that renewable curtailment and batteries, including their degradation, can play to counter-balance these variations. Computational experiments on the real Kasabonika Lake First Nation microgrid and CIGRE benchmark test system show the operational benefits of the proposed EMS, highlighting the need to properly model short-term fluctuations and battery degradation in EMS for isolated microgrids with significant renewable integration.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1949-3053 ISBN Medium
Area Expedition Conference
Notes WOS:000709090100012 Approved
Call Number UAI @ alexi.delcanto @ Serial 1494
Permanent link to this record
 

 
Author del Rio, A.V.; Stachurski, A.; Mendez, R.; Campos, J.L.; Surmacz-Gorska, J.; Mosquera-Corral, A.
Title Short- and long-term orange dye effects on ammonium oxidizing and anammox bacteria activities Type
Year 2017 Publication Water Science And Technology Abbreviated Journal Water Sci. Technol.
Volume 76 Issue 1 Pages 79-86
Keywords adsorption; anammox; AOB; degradation; orange dye; partial nitritation
Abstract The effects of orange azo dye over ammonia oxidizing bacteria (AOB) and anammox bacteria activities were tested. Performed batch tests indicated that concentrations lower than 650 mg(orange)/L stimulated AOB activity, while anammox bacteria activity was inhibited at concentrations higher than 25 mg(orange)/L. Long-term performance of a continuous stirred tank reactor (CSTR) for the partial nitritation and a sequencing batch reactor (SBR) for the anammox process was tested in the presence of 50 mg(orange)/L. In the case of the partial nitritation process, both the biomass concentration and the specific AOB activity increased after 50 days of orange azo dye addition. Regarding the anammox process, specific activity decreased down to 58% after 12 days of operation with continuous feeding of 50 mg(orange)/L. However, the anammox activity was completely recovered only 54 days after stopping the dye addition in the feeding. Once the biomass was saturated the azo dye adsorption onto the biomass was insignificant in the CSTR for the partial nitritation process fed with 50 mg(orange)/L. However, in the SBR the absorption was determined as 6.4 mg(orange)/g volatile suspended solids. No biological decolorization was observed in both processes.
Address [Val del Rio, A.; Mendez, R.; Mosquera-Corral, A.] Univ Santiago de Compostela, Sch Engn, Dept Chem Engn, E-15782 Santiago De Compostela, Spain, Email: mangeles.val@usc.es
Corporate Author Thesis
Publisher Iwa Publishing Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0273-1223 ISBN Medium
Area Expedition Conference
Notes WOS:000405591400008 Approved
Call Number UAI @ eduardo.moreno @ Serial 748
Permanent link to this record
 

 
Author Donoso, R.A.; Ruiz, D.; Garate-Castro, C.; Villegas, P.; Gonzalez-Pastor, J.E.; de Lorenzo, V.; Gonzalez, B.; Perez-Pantoja, D.
Title Identification of a self-sufficient cytochrome P450 monooxygenase from Cupriavidus pinatubonensis JMP134 involved in 2-hydroxyphenylacetic acid catabolism, via homogentisate pathway Type
Year 2021 Publication Microbial Biotechnology Abbreviated Journal Microb. Biotechnol.
Volume 14 Issue 5 Pages 1944-1960
Keywords COMPLETE GENOME SEQUENCE; ELECTRON-TRANSFER; GENE; DEGRADATION; SYSTEM; STRAIN; P450BM3; GROWTH; DOMAIN; HYDROXYLATION
Abstract The self-sufficient cytochrome P450 RhF and its homologues belonging to the CYP116B subfamily have attracted considerable attention due to the potential for biotechnological applications based in their ability to catalyse an array of challenging oxidative reactions without requiring additional protein partners. In this work, we showed for the first time that a CYP116B self-sufficient cytochrome P450 encoded by the ohpA gene harboured by Cupriavidus pinatubonensis JMP134, a beta-proteobacterium model for biodegradative pathways, catalyses the conversion of 2-hydroxyphenylacetic acid (2-HPA) into homogentisate. Mutational analysis and HPLC metabolite detection in strain JMP134 showed that 2-HPA is degraded through the well-known homogentisate pathway requiring a 2-HPA 5-hydroxylase activity provided by OhpA, which was additionally supported by heterologous expression and enzyme assays. The ohpA gene belongs to an operon including also ohpT, coding for a substrate-binding subunit of a putative transporter, whose expression is driven by an inducible promoter responsive to 2-HPA in presence of a predicted OhpR transcriptional regulator. OhpA homologues can be found in several genera belonging to Actinobacteria and alpha-, beta- and gamma-proteobacteria lineages indicating a widespread distribution of 2-HPA catabolism via homogentisate route. These results provide first time evidence for the natural function of members of the CYP116B self-sufficient oxygenases and represent a significant input to support novel kinetic and structural studies to develop cytochrome P450-based biocatalytic processes.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1751-7915 ISBN Medium
Area Expedition Conference
Notes WOS:000664134700001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1426
Permanent link to this record
 

 
Author Pabon-Pereira, C.P.; Hamelers, H.V.M.; Matilla, I.; van Lier, J.B.
Title New Insights on the Estimation of the Anaerobic Biodegradability of Plant Material: Identifying Valuable Plants for Sustainable Energy Production Type
Year 2020 Publication Processes Abbreviated Journal Processes
Volume 8 Issue 7 Pages 23 pp
Keywords anaerobic digestion; biodegradability; lignocellulosics; fiber degradation
Abstract Based on fifteen European plant species, a statistical model for the estimation of the anaerobic biodegradability of plant material was developed. We show that this new approach represents an accurate and cost-effective method to identify valuable energy plants for sustainable energy production. In particular, anaerobic biodegradability (B-o) of lignocellulosic material was empirically found to be related to the amount of cellulose plus lignin, as analytically assessed by the van Soest method, i.e., the acid detergent fiber (ADF) value. Apart from being theoretically meaningful, the ADF-based empirical model requires the least effort compared to the other four proposed conceptual models proposed, as individual fractions of cellulose, hemicellulose, and lignin do not need to be assessed, which also enhances the predictive accuracy of the model's estimation. The model's results showed great predictability power, allowing us to identify interesting crops for sustainable crop rotations. Finally, the model was used to predictB(o)of 114 European plant samples that had been previously characterized by means of the van Soest method.
Address [Pabon-Pereira, Claudia P.] Univ Adolfo Ibanez, Fac Engn & Sci, Diagonal Las Torres 2700, Penalolen 2700, Santiago De Chi, Chile, Email: claudia.pabon@uai.cl;
Corporate Author Thesis
Publisher Mdpi Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2227-9717 ISBN Medium
Area Expedition Conference
Notes WOS:000556716400001 Approved
Call Number UAI @ eduardo.moreno @ Serial 1217
Permanent link to this record