2013•Procedia Environmental SciencesOpen access

A Study of the Determination of Dimensionless Number and its Influence on the Performance of a Combination Wastewater Reactor

Shiqiang Ding, Lei Liu, XU Ji-run

Abstract

Dimensionless Peclet number is applied to describe the flow behavior in a specially designed wastewater reactor with compound flow pattern of plug-flow, baffled-flow and mixed-flow. A set of Peclet numbers is obtained for different fluid conditions by measuring the residence time distribution of a tracer in the reactor. Some experiments were made to examine the quantitative influence of on the removal efficiency of COD, NH4+-N and TP, and the results shown that there is an optimum number representing a certain flow pattern at which best removal rates of COD, NH4+-N and TP are obtained.

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Key concepts: Péclet number, Residence time distribution, Dimensionless quantity, Plug flow, Wastewater, Flow (mathematics), Residence time (fluid dynamics), Plug flow reactor model