某厂清水池壁细菌生长特性研究

On feature of biomass growing on wall of clear water tank

附着在清水池壁生长的生物膜可能使出厂水的细菌数增加,对饮用水的安全性造成威胁。以北京市某水厂清水池壁上自然生成的生物膜为样本,研究了构成该生物膜的微生物种类,形成了比较系统的菌种鉴定方法。研究发现清水池壁的生物膜中存在细菌、放线菌、真菌和酵母菌等多种微生物,这些微生物以革兰氏染色阳性菌为主。这是因为革兰氏阳性菌细胞壁和细胞膜的通透性比较低,不易被消毒剂杀灭,而革兰氏阴性菌的细胞壁和细胞膜的通透性比较高,消毒剂容易透过细胞壁和细胞膜把细菌杀灭。

The biofilm adhering to the wall of the clear water tank can probably resulted in the occurrence of bacteria in waterworks output, thus deteriorate the biological safety of drinking water. The compositions of the bacterial biofilm in clear water tank of a waterworks in Beijing was identified in this paper. The separation and identification of the species in the bacterial biofilm showed that there were still many bacterial species on the wall of the clear water tank even though high disinfectant residuals maintained in it, such as bacteria, actinomyces, fungi and yeast. The G^＋ bacteria were the domain over the whole species. The reasons could contributed to that the cell wall and pericellular membrane of G^＋ bacteria are lower permeable thus the bacteria could resist disinfectants, while the G^- bacteria are higher permeable thus the disinfectants could permeate the cell wall and kill the bacteria.