Dynamic Simulation Experimental Study on Biofouling Formation of Iron Bacteria in Heat Transfer Equipment

In order to investigate the typical scale microbial Iron Bacteria of growth properties in circulating cooling water and water quality parameters factors on biofouling formation, this paper is purposed to deal with the slime which was obtained from the cooling tower bottom of circulating water, then a pure strain of Iron Bacteria was obtained through the separation, purification and enrichment culture. According to the morphological observation, as well as the physiological and biochemical indexes identification, the strain was identified as Sphaerotilus. The tubular heat exchanger dynamic simulation was used to study the biofouling formation with Iron Bacteria in circulating cooling water system. The experimental conditions were as follows: the water temperature 30 ± 0.2 °C, the flow rate 0.4m / s. This paper selected Iron ion concentration, CODcr, pH value, ORP, temperature and the total number of bacteria as the effect factors of biofouling formation, researching the link between Iron Bacteria, water quality parameters and biofouling formation. The results show that: the existence and content of iron bacteria results in directly increasing of fouling resistance; interacting among the parameters, and together determining the formation of biofouling.