Biofilm growth in response to various concentrations of biodegradable material in drinking water.
In: Water Science and Technology, Jg. 55 (2007) ; 8-9, Biofilm Systems VI, S. 191-195
Zeitschriftenaufsatz / Fach: Chemie
Biol. stability is one of the most important aspects of safe drinking water. It depends crucially on the availability of biodegradable org. carbon (BDOC). Measurement of BDOC is time-consuming and only performed if an increase is suspected. In this study, a fiber optical sensor (FOS) was used to detect changes in BDOC, detected as an increase in biofilm growth. The FOS consists of a sending and a receiving optical fiber, the latter connected to a detector. When material is deposited at the tip of the fiber, an increase of backscattered light is detected. In a system fed with drinking water, the signal was correlated to biofilm growth which was confirmed by independent surface colonisation detn. When 1 and 3 mg L-1 of BDOC resp. was added, the increment of the FOS signal over a period of 1 wk could be distinguished. Interference by planktonic components and humic substances could be excluded. The biofilm on the FOS could be used as a means to detect changes in BDOC in drinking water and the signal has an early warning capacity.
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