Schmid T, Panne U, Adams J, Niessner R
Institute of Hydrochemistry, Technical University of Munich, Marchioninistr. 17, 81377 Munich, Germany.
Water Res. 2004 Mar;38(5):1189-96. doi: 10.1016/j.watres.2003.10.057.
The undesired growth of biofilms on solid surfaces is often termed biofouling. Biofilms consist mainly of water and microbial cells which are embedded in a biopolymer matrix. Biofouling lowers the water quality and increases the frictional resistance in tubes. Further, biofilms increase the pressure differences in membrane processes and can clog filtration membranes, valves, and nozzles. For investigation and improvement of biocide efficacy and anti-fouling strategies, on-line and in situ monitoring of the biofilm is necessary. In this study, photoacoustic spectroscopy (PAS) was employed for biofilm monitoring. PAS allows the depth-resolved investigation of growth and detachment processes of biofilms. Strategies based on the oxidant hydrogen peroxide were compared to popular isothiazolinone biocides. Hydrogen peroxide allowed a very fast and efficient removal of attached biofilms, whereas no effect on the biofilm matrix was observed in most cases when isothiazolinone biocides were used.
生物膜在固体表面的不良生长通常被称为生物污染。生物膜主要由水和嵌入生物聚合物基质中的微生物细胞组成。生物污染会降低水质并增加管道中的摩擦阻力。此外，生物膜会增加膜过程中的压力差，并可能堵塞过滤膜、阀门和喷嘴。为了研究和提高杀菌剂的功效以及防污策略，对生物膜进行在线和原位监测是必要的。在本研究中，采用光声光谱法（PAS）对生物膜进行监测。PAS能够对生物膜的生长和脱落过程进行深度分辨研究。将基于氧化剂过氧化氢的策略与常用的异噻唑啉酮类杀菌剂进行了比较。过氧化氢能够非常快速且有效地去除附着的生物膜，而在大多数情况下，使用异噻唑啉酮类杀菌剂时未观察到对生物膜基质有影响。
