|
(79-07) Toxicity reduction evaluation of groundwater using on-line biomonitoring. Küster, Eberhard*,1, Dorusch, Falk1, Weiss, Holger1, Altenburger, Rolf1, 1 UFZ Centre for Environmental Research Leipzig-Halle, Leipzig, Germany ABSTRACT- On-line biomonitoring is commonly used as an early warning system for controlling the water quality for unexpected waves of toxicity. An on-line biomonitor to be used in controlling remediation success has to meet different requirements. Instead of measuring the "absence" of toxicity a biomonitor controlling remediation is usually testing for non-toxic effects which is the reversal of the common situation. The technical prerequisites for testing toxic samples have to be adapted. The material of the on-line biomonitor, like the piping, the pumps, measuring devices etc. have to cope with higher strains or chemical burden. The risk of sample mixing and cross contamination in and before the biomonitor have to be minimized. Other requirements are the obligations to test not only for the compounds to be remediated but also to differentiate between contaminant correlated and non-correlated toxicity. If there is more than one remediation technique to be monitored the software also has to be adapted. An on-line biomonitor which is already used for toxicity reduction evaluation (TRE) and remediation control of highly contaminated groundwater in the Bitterfeld area (Germany, SAFIRA-http://safira.pro.ufz.de/) is presented. The technical improvements for the parallel monitoring of two and more remediation techniques are shown. The implementation of measuring devices for the on-line observation of confounding factors -which might be responsible for a certain basal toxicity- are presented. Advantages, drawbacks and disadvantages of the on-line biomonitors using luminescent bacteria are discussed. Key words: on-line biomonitoring, groundwater , remediation, vibrio fischeri |
