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39. Physicochemical and biochemical actions in natural systems for refractory pollutants removal and safe water reuse

Author

Wang, Xiaochang, speaker

Abstract

Safety control of effluent quality from a wastewater treatment plant is the long-last topic for the selection of treatment processes and/or designing a comprehensive system to achieve the goal of ecological and human health risk reduction, especially when the treated water is to be reused for various purposes. In order to understand what kind of functions natural systems may perform, studies were conducted targeting trace pollutants removal through a mimic natural water cycle where the secondary effluent is the sole source for water landscaping and multifunctional reuse. Attentions were paid to four categories of trace organics and their associated biotoxicities. The study results revealed that physicochemical actions, such as adsorption by soil particles and sunlight induced photolysis, performed the most important role. Aquatic life, including plants and animals, effectively enhanced the reduction of certain antibiotics, while many organics refractory to biodegradation became biodegradable during longer hydraulic retention. Hybridization of engineered and natural/ecological processes can thus be a direction of system optimization to secure safe water reuse under lower treatment costs.

Published
2023
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40. A Global Hartman-Grobman Theorem

Author

Wang, Xiaochang

Subjects
Mathematics - Dynamical Systems
Abstract

We showed that for any bounded neighborhood of a hyperbolic equilibrium point $x_0$, there is a transformation which is locally homeomorphism, such that the system is changed into a linear system in this neighborhood. If the eigenvalues of $Df(x_0)$ are all located in the left-half complex plane, then there is a homeomorphism on the whole region of attraction such that the nonlinear system on the region of attraction is changed into a linear system under such a coordinate change.

Published
2020

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