Abstract:

A slime-forming bacterial strain N1 was isolated from Songhua River，which was identified as Micrococcus according to morphological observation，as well as identification of physiological and biochemical indexes. A dynamic simulation system with stainless steel tube heat exchanger was used to study the influences of the total number of bacteria change on the fouling resistance of the heat transfer surface at industrial working environment. On-line monitoring results showed that the total number of bacteria changes are positively related to the fouling resistance. The sticky mud on the tube wall was analyzed and proved containing 10⁷ cfu/mL of the micro-organisms. Elemental analysis indicated that the major ingredients of sticky mud are C，O，N and Cl similar to the essential composition of micro-organisms. Thus，the strain N1 was proved to have the characteristics of adhesion to heat transfer surface and forming the sticky mud，which is very significant for understanding the formation mechanism of microbial fouling，especially the changes at the start-up phase of fouling formation. These results may provide a basis for the design of heat transfer equipments with high-performance.

摘要：

从松花江水中分离纯化出黏液形成菌N1，形态学及生理生化指标鉴定其为微球菌属。利用动态模拟实验装置，研究此菌株在工业运行环境下细菌总数的变化对不锈钢管式换热器传热表面污垢热阻的影响。在线监测结果显示，细菌总数与污垢热阻变化成正相关；对管壁黏泥分析的结果显示，其中含有约10⁷ cfu/mL的微生物；元素分析结果发现，黏泥内主要成分为C、O、N和Cl，这与微生物基本元素组成相似，表明菌株N1有黏附于传热表面形成黏泥的特性。这对认识微生物污垢形成机制，尤其是形成起始阶段的变化有重要意义，将为新型高效换热设备的设计提供依据。