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Evaluation of Mixing Efficiency in Coagulation-Flocculation Process in Wastewater Treatment

Journal of Environmental Science and Engineering(A) 2012年第7期1卷 898-903页

作者： tamas karches Department of Sanitary and Environmental Engineering Budapest University of Technology and Economics (BME) BudapestH-1111 Hungary

Fluid flow and mixing phenomenon have a significant impact on coagulation and flocculation processes. Particles dissipating the turbulent kinetic energy increase the efficiency of collision, grow in size and incorporate phosphate from the wastewater Only certain flocks can be separated depending on their stability, size, density, etc.. According to the literature the velocity gradient of the flow （G-value） is the main design parameter of the flocculators, but there is a need to take into account at least the flocks age, too. In this paper, it presents a novel approach to determine the efficiency of flocculators using local mean age theory, residence time distribution and dimensional analysis. Calculations were performed for two constructions of cascade reactors---one with small baffles and one without these; hydraulical performance and the achievable conversion were compared. As a result, the flocculator with small baffles proved to be more efficient than the traditional construction.

关键词： Flocculation kinetics fluid dynamics G-value local mean age wastewater treatment.

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Estimation of GHG Emissions of a Fixed Bed Biofilm Reactor Cascade in Wastewater Treatment

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Journal of Environmental Science and Engineering(A) 2015年第11期4卷 559-566页

作者： Daniel Bencsik tamas karches Department of Chemical and Environmental Process Engineering Budapest University of Technology and Economics Budapest 1111 Hungary Institute of Water Supply and Environmental Engineering EOtvOs Jozsef College Baja 6500 Hungary

A pilot scale fixed bed biofilm reactor used for treating municipal wastewater was modelled to examine greenhouse gas emissions under different operational parameters. For the calculations, GPS-X 6.3 commercial simulation tool was applied, which coupled the biokinetic modelling with a GHG estimator. Model calibration was based on a twelve-day set of measurements, where the system was operated under near steady-state condition. Simulation results reflected that direct emissions from biological processes are more significant than indirect emissions originating from energy consumption. Optimizing the operational parameters of a wastewater treatment system, a significant amount of GHG emission can be spared （e.g. optimal setup for internal recycle flow and dissolved oxygen levels）, whereas, environmental factors such as temperature can also have a remarkable effect on GHG emissions： rising temperature causes faster biological reactions, increasing the production of greenhouse gases, especially methane, from the inner layers of the thick biofilm.

关键词： Biofilm biokinetic modelling greenhouse gas emission wastewater treatment.

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