Modeling Iron Bacteria Fouling Resistance With EMF And Analysising

This article is for the phenomenon of electromagnetic fields anti iron bacteria in industrial cooling water. The mechanism of electromagnetic fields anti iron bacteria is deduced in this article. With the theory of the fracture of H-bonds, water parameters, fluid flow rate and roughness of the inner wall of the pipe as representative factors, which represent characteristics of water quality, characteristics of operate and characteristics of the material. They are used to establish electromagnetic fields anti iron bacteria model. The main research content of this article is two parts.Basing on the theory of microbial growth kinetics, deposit and erosion during microbial growing are related, which is used to model iron bacteria resistance. With the theory of electric double layer, charge density of inner wall of the pipe is determined. Electromagnetic fields with constant size and pipe wall direction is added. With the relationship of colloidal particles experience shear forces are equal to electromagnetic force in electromagnetic fields, model is established. Water parameters, fluid flow rate and roughness of the inner wall of the pipe are introduced. As an index, electromagnetic iron bacteria efficiency is introduced. The influence of three parameters to resistance is analyzed.Growth curve of biofouling is drawed and results are calculated with program in Matlab. Firstly, flow rate and roughness are setted stable. Single water parameter(pH, conductivity, dissolved oxygen and Fe ion concentration) and synthesized water parameters corresponding to biofoul growing curve and electromagnetic anti iron bacteria efficiency with EMF or not. Roughness is setted stable, three successively larger flow rate value are given, biofoul growing curve and electromagnetic anti-fouling efficiency are compared. Influences of flow rates to electromagnetic anti-fouling are summarized. The change trends of roughness and angle θ are consistent. Three successively larger roughness are choosed corresponding to θ. Using control variable, two other parameters are setted stable. Influences of roughness to fouling and electromagnetic anti-fouling efficiency are compared by curve and values.The results show that the effect of different water parameters to electromagnetic anti iron bacteria efficiency is not remarkable though reasonable assumptions and simplification. The model is reasonable. With flow rate increasing, biofouling is reducing with EMF or not. Electromagnetic anti iron bacteria efficiency is reducing. Intensified scour is hard for fouling to attach. The rougher of inner wall of pipe, the faster of fouling’s growth, the smaller of electromagnetic anti iron bacteria efficiency, the attachment of fouling on rough pipe inner wall is faster. But it does not change the final value of fouling.