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Knowledge-based fuzzy system for diagnosis and control of an integrated biologi...
Pires, O. C.; Palma, C.; Costa, J. C.; Moita, I.; Alves, M. M.; Ferreira, E. C.A supervisory expert system based on fuzzy logic rules was developed for diagnosis and control of a laboratory- scale plant comprising anaerobic digestion and anoxic/aerobic modules for combined high rate biological N and C removal. The design and implementation of a computational environment in LabVIEW for data acquisition, plant operation and distributed equipment control is described. A step increase in ammo...
A fuzzy-logic based expert system for diagnosis and control of an integrated wa...
Pires, O. C.; Palma, C.; Moita, I.; Costa, J. C.; Alves, M. M.; Ferreira, E. C.A supervisory expert system based on fuzzy logic rules was developed for diagnosis and control of a lab- scale plant comprising anaerobic/anoxic/aerobic modules for combined high rate biological N and C removal. The design and implementation of a computational environment in LabVIEW for data acquisition, plant operation and distributed equipment control is described. The Fuzzy Logic toolbox for MATLAB was also ...
Anaerobic biodegradation of oleic and palmitic acids : evidence of mass transfe...
Pereira, M. A.; Pires, O. C.; Mota, M.; Alves, M. M.Palmitic acid was the main long chain fatty acids (LCFA) that accumulated onto the anaerobic sludge when oleic acid was fed to an EGSB reactor. The conversion between oleic and palmitic acid was linked to the biological activity. When palmitic acid was fed to an EGSB reactor it represented also the main LCFA that accumulated onto the sludge. The way of palmitic acid accumulation was different in the oleic and i...
Knowledge-based fuzzy system for diagnosis and control of an integrated biologi...
Pires, O. C.; Palma, C.; Costa, J. C.; Moita, I.; Alves, M. M.; Ferreira, E. C.A supervisory expert system based on fuzzy logic rules was developed for diagnosis and control of a lab- scale plant comprising anaerobic/anoxic/aerobic modules for combined high rate biological N and C removal. The design and implementation of a computational environment in LabVIEW for data acquisition, plant operation and distributed equipment control is described. A step increase in ammonia concentration fro...
Anaerobic degradation of oleic acid by suspended and granular sludge : identifi...
Pereira, M. A.; Pires, O. C.; Mota, M.; Alves, M. M.The aim of the present work was to study the maximum potential methane production in batch assays of sludge samples taken along the operation of two EGSB reactors (RI inoculated with granular sludge and RII inoculated with suspended sludge) fed with increasing oleic acid concentrations between 2 and 8 gCOD/l (HRT = 1 day). After removing the residual substrate, the sludge was incubated in batch vials without an...
Influence of up-flow velocity on the performance of an anaerobic filter under o...
Ribeiro, N. J.; Pires, O. C.; Mota, M.; Ferreira, E. C.; Alves, M. M.An upflow velocity of 0.21 m h−1 was optimal to minimize the effect of organic shocks (from 6 to 30 kg COD m−3 d−1) when operating an upflow anaerobic filter for the treatment of an oleic acid-based effluent (50% w/v COD). This value represented the transition between a mass transfer controlled regime and a kinetic regime. Under hydraulic shock loads, an increase in upflow velocity from 0.3 to 0.4 m h−1 decreas...
Sequencing adsorption and degradation cycles towards the methanization of long ...
Pereira, M. A.; Pires, O. C.; Mota, M.; Alves, M. M.The aim of the present work was to study the maximum potential methane production in batch assays of sludge samples taken along the operation of two EGSB reactors (RI inoculated with granular sludge and RII inoculated with suspended sludge) fed with increasing oleic acid concentrations between 2 and 8 gCOD/l (HRT=1 day). After removing the residual substrate, the sludge was incubated in batch vials without any ...
Extraction and analysis of long chain fatty acids adsorbed onto active and inac...
Pires, O. C.; Pereira, M. A.; Alves, M. M.; Mota, M.Extraction and GC analysis of the adsorbed long chain fatty acids onto active and inactivated sludge taken from two EGSB reactors fed with oleic acid as the sole carbon source at 6 kgCOD/m3.day was determined. No gradual acclimation of sludge to this LCFA was performed. Active sludge had been overloaded with oleic acid in a previous experiment and a possible retrieval of its activity was investigated. However t...
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