The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform

Gerba Charles - One of the best experts on this subject based on the ideXlab platform.

  • Laboratory assessment of a gravity-fed ultrafiltration water treatment device designed for household use in low-income settings.
    'American Society of Tropical Medicine and Hygiene', 2009
    Co-Authors: Clasen Thomas, Naranjo Jaime, Frauchiger Daniel, Gerba Charles
    Abstract:

    Interventions to improve water quality, particularly when deployed at the household level, are an effective means of preventing endemic diarrheal disease, a leading cause of mortality and morbidity in the developing world. We assessed the microbiologic performance of a novel water treatment device designed for household use in low-income settings. The device employs a backwashable hollow fiber ultrafiltration cartridge and is designed to mechanically remove enteric pathogenic bacteria, viruses, and protozoan cysts from drinking water without water pressure or electric power. In laboratory testing through 20,000 L (approximately 110% of design life) at moderate Turbidity (15 Nephelometric Turbidity Unit [NTU]), the device achieved log(10) reduction values of 6.9 for Escherichia coli, 4.7 for MS2 coliphage (proxy for enteric pathogenic viruses), and 3.6 for Cryptosporidium oocysts, thus exceeding levels established for microbiological water purifiers. With periodic cleaning and backwashing, the device produced treated water at an average rate of 143 mL/min (8.6 L/hour) (range 293 to 80 mL/min) over the course of the evaluation. If these results are validated in field trials, the deployment of the Unit on a wide scale among vulnerable populations may make an important contribution to public health efforts to control intractable waterborne diseases

Clasen Thomas - One of the best experts on this subject based on the ideXlab platform.

  • Laboratory assessment of a gravity-fed ultrafiltration water treatment device designed for household use in low-income settings.
    'American Society of Tropical Medicine and Hygiene', 2009
    Co-Authors: Clasen Thomas, Naranjo Jaime, Frauchiger Daniel, Gerba Charles
    Abstract:

    Interventions to improve water quality, particularly when deployed at the household level, are an effective means of preventing endemic diarrheal disease, a leading cause of mortality and morbidity in the developing world. We assessed the microbiologic performance of a novel water treatment device designed for household use in low-income settings. The device employs a backwashable hollow fiber ultrafiltration cartridge and is designed to mechanically remove enteric pathogenic bacteria, viruses, and protozoan cysts from drinking water without water pressure or electric power. In laboratory testing through 20,000 L (approximately 110% of design life) at moderate Turbidity (15 Nephelometric Turbidity Unit [NTU]), the device achieved log(10) reduction values of 6.9 for Escherichia coli, 4.7 for MS2 coliphage (proxy for enteric pathogenic viruses), and 3.6 for Cryptosporidium oocysts, thus exceeding levels established for microbiological water purifiers. With periodic cleaning and backwashing, the device produced treated water at an average rate of 143 mL/min (8.6 L/hour) (range 293 to 80 mL/min) over the course of the evaluation. If these results are validated in field trials, the deployment of the Unit on a wide scale among vulnerable populations may make an important contribution to public health efforts to control intractable waterborne diseases

Reza Dabirian - One of the best experts on this subject based on the ideXlab platform.

  • Construcción con tecnología abierta de un sensor de turbidez de bajo costo
    2016
    Co-Authors: Cristhian Román-herrera, David Loza-matovelle, Luis Javier Segura, Reza Dabirian
    Abstract:

    A novel device for measuring Turbidity was designed and built. The device was prepared using low cost components and open source technology such as Arduinos, 3-D printers and open source software. The device consists of two main parts; firstly a LED which emits light and secondly a system that measures the light that passes through the sample holder. The amount of light is quantified to obtain a value of the Turbidity of the sample. A detector setup with two light receptors aligned at 90° with respect to each other was chosen in order to increase the sensitivity of the instrument. The device was calibrated and showed a sensitivity range between 50 and 650 Nephelometric Turbidity Unit (NTU). As part of the system validation test samples of the device were compared with those of a commercial HACH Turbidity sensor and the disparity was just 3.3%. The device is intended to be used to monitor the efficiency of removal of suspended particles in soils as well as treatment of wastewater in rural regions of Ecuador.

  • The construction of an open source based low cost Turbidity sensor
    2016
    Co-Authors: Cristhian Román-herrera, David Loza-matovelle, Luis Javier Segura, Reza Dabirian
    Abstract:

    A novel device for measuring Turbidity was designed and built.  The  device  was  prepared  using low cost  components  and  open  source  technology  such  as Arduinos, 3-D printers and open source software. The device consists of two main parts; firstly a LED which emits light and secondly a system that measures the light that passes through the  sample  holder. The amount of  light is quantified to obtain a value of the Turbidity of the sample. A  detector  setup  with  two  light  receptors  aligned at  90o  with  respect  to  each  other  was  chosen  in  order to increase the sensitivity of the instrument. The device was calibrated and showed a sensitivity range between 50 and 650 Nephelometric Turbidity Unit (NTU). As part of the system validation test samples of the device were compared with those of a commercial HACH Turbidity sensor and the disparity was just 3.3%. The device is intended  to  be  used  to  monitor  the  efficiency  of  removal of  suspended  particles  in  soils  as  well  as  treatment  of wastewater in rural regions of Ecuador.

Dabirian Reza - One of the best experts on this subject based on the ideXlab platform.

  • Construcción con tecnología abierta de un sensor de turbidez de bajo costo
    'Universidad Santo Tomas', 2016
    Co-Authors: Román-herrera Cristhian, Loza-matovelle David, Segura Luis, Dabirian Reza
    Abstract:

    A novel device for measuring Turbidity was designed and built.  The  device  was  prepared  using low cost  components  and  open  source  technology  such  as Arduinos, 3-D printers and open source software. The device consists of two main parts; firstly a LED which emits light and secondly a system that measures the light that passes through the  sample  holder. The amount of  light is quantified to obtain a value of the Turbidity of the sample. A  detector  setup  with  two  light  receptors  aligned at  90º  with  respect  to  each  other  was  chosen  in  order to increase the sensitivity of the instrument. The device was calibrated and showed a sensitivity range between 50 and 650 Nephelometric Turbidity Unit (NTU). As part of the system validation test samples of the device were compared with those of a commercial HACH Turbidity sensor and the disparity was just 3.3%. The device is intended  to  be  used  to  monitor  the  efficiency  of  removal of  suspended  particles  in  soils  as  well  as  treatment  of wastewater in rural regions of Ecuador.Un dispositivo para medir turbidez fue desarrollado incorporando componentes de bajo costo y tecnología abierta, como Arduino, impresoras 3D y software libre. El dispositivo consta de un LED que emite luz y un sensor que recepta la luz que atraviesa el líquido por medir. Se cuantifica la cantidad de luz que se recepta para obtener una medida. Se analizaron diferentes alternativas y se seleccionó un sistema con dos receptores dispuestos a 90º para obtener los resultados requeridos. Para su calibración se realizaron diferentes pruebas y se obtuvo un rango efectivo entre 50 NTU hasta 650 unidades nefelométricas de turbidez (NTU). Para validar el equipo se comparo con un turbidímetro comercial modelo HACH 2100Q obteniendo resultados con un error 3.3%. La aplicabilidad de este equipo va dirigida al control de la eficiencia de remoción de sólidos suspendidos en plantas de tratamiento de aguas servidas en regiones rurales del Ecuador

M. Mameri - One of the best experts on this subject based on the ideXlab platform.

  • Electrocoagulation of chemical mechanical polishing wastewater
    Desalination, 2007
    Co-Authors: Nadjib Drouiche, Noreddine Ghaffour, Hakim Lounici, M. Mameri
    Abstract:

    Treatment of chemical mechanical polishing (CMP) wastewater was investigated. The CMP wastewater, as obtained from surface treatment of photovoltaic wafers, was characterized by high suspended solids, high Nephelometric Turbidity Unit (NTU), chemical oxygen demand (COD) and green color. This study determines the feasibility of CMP wastewater treatment by the electrocoagulation process. The COD concentration of the CMP wastewater was found in the range of 700 mg/l which is below the discharge standards. The analysis of the wastewater before and after electrocoagulation shows that the electrochemical process was a total barrier for the metal species, color and a significant reduction in the concentration of the fluoride and sulfate ions.