Enrique La Motta | University of New Orleans (original) (raw)
Papers by Enrique La Motta
Journal of ship production and design, May 1, 2013
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Ingeniería del agua, 2020
Este artículo presenta herramientas gráficas para diseño de tuberías de alcantarillado sanitario ... more Este artículo presenta herramientas gráficas para diseño de tuberías de alcantarillado sanitario con autolimpieza por tensión de corte, para diámetros entre 100 y 400 mm, usando dos diferentes criterios: primero, considerando la suposición que con el caudal mínimo se desarrollará un esfuerzo cortante igual al generado por la tubería llena a una velocidad de 0.6, 0.7 y 0.8 m/s, y segundo, usando tensiones de corte mínimas de 0.867, 1.4 y 2 N/m2. Estas herramientas consisten en curvas para determinar la pendiente de autolimpieza, la profundidad relativa, el caudal máximo que puede ser transportado con una profundidad relativa de 0.8D, y las velocidades para flujo lleno y parcialmente lleno para un caudal mínimo dado. También se incluyen ecuaciones para determinar tanto un valor aproximado de la pendiente de autolimpieza, como la pendiente exacta. Se consideró un coeficiente de rugosidad de Manning constante de 0.009 s/m1/3, correspondiente a tuberías nuevas de PVC.
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Most of the activated sludge models developed for the substrate removal kinetics have commonly as... more Most of the activated sludge models developed for the substrate removal kinetics have commonly assumed that the organic matter is dissolved, and do not include an identification of the fraction of the total COD (TCOD) that is truly dissolved (DCOD), nor the fraction that is particulate COD (PCOD). Recognizing that not all the COD in wastewater is dissolved, recent research efforts have concentrated on modeling the hydrolysis of particulate organic matter once it is trapped in the biological floc particles. However, little effort has been made in identifying how the particulate matter is actually removed form the liquid phase. Research performed at the University of New Orleans experimental station at Marrero, Louisiana, USA, has revealed that most of the TCOD in wastewater is PCOD, and that only 20% is DCOD. Therefore, biological flocculation must play an important role on PCOD removal. To ascertain this role, carefully controlled experiments were run using a 6 m3/d continuous flow ...
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Journal of the Environmental Engineering Division, 1982
In certain biofilm processes, such as nitrification and anaerobic carbon removal, biofilm attachm... more In certain biofilm processes, such as nitrification and anaerobic carbon removal, biofilm attachment and growth may take several weeks or even months. This research focuses on determining the effect of synthetic and naturally produced polymers, used as surface conditioners, on the rate of biofilm attachment and growth. Partial success was obtained, and the only practical alternative seems to be to precondition the surface of the media by growing an easy-to-develop biological film before the final biofilm is induced to grow. This paper also reviews the literature which describes the factors affecting the attached growth of bacteria.
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Journal of the Sanitary Engineering Division, 1971
The variation in concentration of flocculent particles in the sludge blanket of an upflow clarifi... more The variation in concentration of flocculent particles in the sludge blanket of an upflow clarifier or reactor is a function of the upflow velocity of the liquid. The nature of this functional relationship for discrete particles has been determined by others. The experimental work of this investigation demonstrates that the same general type of relationship applies to flocculent particles. The results should prove useful in the further investigation of the behavior of upflow units as physical-chemical reactors.
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Heliyon
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Journal of Environmental Engineering
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International Journal of Engineering Research and Applications, 2017
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J Am Water Resour Assoc, 1995
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Journal of Environmental Engineering, Mar 15, 2012
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Journal of Environmental Engineering, Apr 1, 1995
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Journal of Environmental Engineering, 1996
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Applied and environmental microbiology, 1976
The rates of growth and substrate uptake in a biological film continuous-flow reactor were studie... more The rates of growth and substrate uptake in a biological film continuous-flow reactor were studied. The experiments were performed with high fluid velocities to bring the reactor operation to the reaction-controlled regime, thus avoiding external diffusional resistances. The glucose uptake experiments were performed with small film thicknesses so that full substrate penetration within the entire film thickness could be obtained. In this way, the catalyst effectiveness factor was 1.0 and the observed rate was the true, or intrinsic, rate. The results of the experiments indicate that both the intrinsic rate of substrate uptake and the rate of film growth are independent of the substrate concentration remaining in the reactor (zero-order reactions). However, the value of the initial substrate concentration when the film is in the early stages of growth defines the magnitude of both the rate of uptake and growth. This effect of the initial substrate concentration follows a saturation-fu...
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Journal of Environmental Management, 2014
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International Journal of Engineering Research and Applications, 2017
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Journal of ship production and design, May 1, 2013
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Ingeniería del agua, 2020
Este artículo presenta herramientas gráficas para diseño de tuberías de alcantarillado sanitario ... more Este artículo presenta herramientas gráficas para diseño de tuberías de alcantarillado sanitario con autolimpieza por tensión de corte, para diámetros entre 100 y 400 mm, usando dos diferentes criterios: primero, considerando la suposición que con el caudal mínimo se desarrollará un esfuerzo cortante igual al generado por la tubería llena a una velocidad de 0.6, 0.7 y 0.8 m/s, y segundo, usando tensiones de corte mínimas de 0.867, 1.4 y 2 N/m2. Estas herramientas consisten en curvas para determinar la pendiente de autolimpieza, la profundidad relativa, el caudal máximo que puede ser transportado con una profundidad relativa de 0.8D, y las velocidades para flujo lleno y parcialmente lleno para un caudal mínimo dado. También se incluyen ecuaciones para determinar tanto un valor aproximado de la pendiente de autolimpieza, como la pendiente exacta. Se consideró un coeficiente de rugosidad de Manning constante de 0.009 s/m1/3, correspondiente a tuberías nuevas de PVC.
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Most of the activated sludge models developed for the substrate removal kinetics have commonly as... more Most of the activated sludge models developed for the substrate removal kinetics have commonly assumed that the organic matter is dissolved, and do not include an identification of the fraction of the total COD (TCOD) that is truly dissolved (DCOD), nor the fraction that is particulate COD (PCOD). Recognizing that not all the COD in wastewater is dissolved, recent research efforts have concentrated on modeling the hydrolysis of particulate organic matter once it is trapped in the biological floc particles. However, little effort has been made in identifying how the particulate matter is actually removed form the liquid phase. Research performed at the University of New Orleans experimental station at Marrero, Louisiana, USA, has revealed that most of the TCOD in wastewater is PCOD, and that only 20% is DCOD. Therefore, biological flocculation must play an important role on PCOD removal. To ascertain this role, carefully controlled experiments were run using a 6 m3/d continuous flow ...
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Journal of the Environmental Engineering Division, 1982
In certain biofilm processes, such as nitrification and anaerobic carbon removal, biofilm attachm... more In certain biofilm processes, such as nitrification and anaerobic carbon removal, biofilm attachment and growth may take several weeks or even months. This research focuses on determining the effect of synthetic and naturally produced polymers, used as surface conditioners, on the rate of biofilm attachment and growth. Partial success was obtained, and the only practical alternative seems to be to precondition the surface of the media by growing an easy-to-develop biological film before the final biofilm is induced to grow. This paper also reviews the literature which describes the factors affecting the attached growth of bacteria.
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Journal of the Sanitary Engineering Division, 1971
The variation in concentration of flocculent particles in the sludge blanket of an upflow clarifi... more The variation in concentration of flocculent particles in the sludge blanket of an upflow clarifier or reactor is a function of the upflow velocity of the liquid. The nature of this functional relationship for discrete particles has been determined by others. The experimental work of this investigation demonstrates that the same general type of relationship applies to flocculent particles. The results should prove useful in the further investigation of the behavior of upflow units as physical-chemical reactors.
Bookmarks Related papers MentionsView impact
Heliyon
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Journal of Environmental Engineering
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International Journal of Engineering Research and Applications, 2017
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J Am Water Resour Assoc, 1995
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Journal of Environmental Engineering, Mar 15, 2012
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Journal of Environmental Engineering, Apr 1, 1995
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Journal of Environmental Engineering, 1996
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Applied and environmental microbiology, 1976
The rates of growth and substrate uptake in a biological film continuous-flow reactor were studie... more The rates of growth and substrate uptake in a biological film continuous-flow reactor were studied. The experiments were performed with high fluid velocities to bring the reactor operation to the reaction-controlled regime, thus avoiding external diffusional resistances. The glucose uptake experiments were performed with small film thicknesses so that full substrate penetration within the entire film thickness could be obtained. In this way, the catalyst effectiveness factor was 1.0 and the observed rate was the true, or intrinsic, rate. The results of the experiments indicate that both the intrinsic rate of substrate uptake and the rate of film growth are independent of the substrate concentration remaining in the reactor (zero-order reactions). However, the value of the initial substrate concentration when the film is in the early stages of growth defines the magnitude of both the rate of uptake and growth. This effect of the initial substrate concentration follows a saturation-fu...
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Journal of Environmental Management, 2014
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International Journal of Engineering Research and Applications, 2017
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Solved Examples on the Design of Water Supply and Wastewater Collection Systems, 2020
This book is designed to be a complement to regular textbooks on the subject matter, for use in s... more This book is designed to be a complement to regular textbooks on the subject matter, for use in senior design undergraduate courses in civil/environmental engineering programs. The usual prerequisites for such courses are an introductory environmental engineering course and a first
course in fluid mechanics. Senior civil/environmental engineering students taking Design of Water Supply and Wastewater Collection Systems are also expected to have a basic understanding of statistics and a good handling of Microsoft Excel.
This book includes the class notes the author has used for more than 40 years of teaching this course, as well as the detailed solution of about 130 solved practical design problems, which emphasize the application of Microsoft Excel tools, such as Solver, Goal Seek and the NORMDIST function, for the solution of simultaneous non-linear equations and non-linear
regression analysis problems frequently encountered in the field.
Each chapter includes a bullet summary of the main topics covered, followed by solved examples, some of which address design issues encountered in the field.
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