Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing, P.R. China.
Biofouling. 2013;29(5):513-23. doi: 10.1080/08927014.2013.790014. Epub 2013 May 13.
Biofouling causes significant losses in efficiency in heat exchangers recovering waste heat from treated sewage. The influence of the temperature field on biofouling was investigated using a flat plate heat exchanger which simulated the channels in a plate and frame unit. The test surface was a 316 stainless steel plate, and a solution of Bacillus sp. and Aeromonas sp. was used as a model process liquid. The test cell was operated under co-current, counter-current, and constant wall temperature configurations, which gave different temperature distributions. Biofouling was monitored via changes in heat transfer and biofilm thickness. The effect of uniform temperature on biofouling formation was similar to the effect of uniform temperature on planktonic growth of the organisms. Further results showed that the temperature field, and particularly the wall temperature, influenced the rate of biofouling strongly. The importance of wall temperature suggests that fouling could be mitigated by using different configurations in summer and winter.
生物污垢会导致从处理后的污水中回收废热的热交换器效率显著降低。本研究使用平板式热交换器（模拟板式和框架式单元中的通道）来研究温度场对生物污垢的影响。试验表面为 316 不锈钢板，采用芽孢杆菌和气单胞菌的混合溶液作为模型工艺液。试验单元分别在并流、逆流和恒温壁温条件下运行，以产生不同的温度分布。通过传热和生物膜厚度的变化来监测生物污垢。均匀温度对生物污垢形成的影响与均匀温度对浮游生物生长的影响相似。进一步的结果表明，温度场，特别是壁温，强烈影响生物污垢的形成速率。壁温的重要性表明，可以通过在夏季和冬季采用不同的配置来减轻污垢。
