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EEWR Brown Bag Seminar with Mohammad Allouche and Yanhong Bian, Graduate Students

Speaker: Mohammod Allouche and Yanhong Bian, Graduate Students
Series: EEWR Brown Bag Seminars
Location: Engineering Quad E225
Date/Time: Friday, March 1, 2019, 12:00:00 p.m. - 01:00:00 p.m.

Abstract:

Mohammad Allouche: Characterizing Intermittency in the Stable Arctic Atmospheric Boundary Layer

Mohammad AlloucheThe stable atmospheric boundary layer (SABL) remains one of the most challenging topics in boundary layer meteorology in terms of modeling and parameterization. A specific challenge is to understand the intermittent turbulence regime observed in the strongly stable case. The atmospheric surface layer (ASL) under such regime is characterized by transitions between turbulent and laminar states, known as “intermittency”. We analyze field experimental data from Barrow, Alaska to understand the “bimodal feature” of these transitions and to identify a statistical metric to detect and quantify intermittency, and then we investigate the origins of these bursts based on analyses of the Turbulent Kinetic Energy budget equation. Finally, the eddy diffusion theory during intermittent periods is  investigated, and different approaches for turbulence closure based on the vertical velocity variance and proposed mixing length scales are examined.

Yanhong Bian: Nutrients removal and recovery in wastewater through flow-electrode capacitive deionization

Yanhong BianMunicipal wastewater contains significant amount of nitrogen and phosphorus nutrients. Traditionally they have been removed by using biological nutrient removal processes, which can be complex and energy intensive. Removing and recovering nutrients in wastewater can mitigate challenges of both environmental systems and fertilizer demands while improving water quality. Since any charged ion species can be adsorbed by the electric double layer on the surface of carbon electrodes, which can be released and concentrated via regeneration. Electrochemical processes carry good potentials to remove and recover ionic nutrients such as ammonium and phosphate in wastewater. In this study, we explore the feasibility to remove and recover nutrients through electrochemical process flow-electrode capacitive deionization (FCDI). The effects of carbon  loadings, different operation modes and competition between various nutrients in FCDI were investigated. Results showed that FCDI could provide a new alternative nutrients removal and recovery solution especially for distributed systems.