Blessing B, Fritz-Langen H, Krebs F
Schriftenr Ver Wasser Boden Lufthyg. 1992;89:247-54.
A commercially available bacterial toxicity monitor ("Toxiguard", BTG Anlagentechnik, Bochum, Germany) was tested for continuous river monitoring. Operating with biofilms, this system shall detect toxic substances in the water. River water passes through two bioreactors forming a biofilm of characteristic river bacteria. The indicating parameter of the biomonitor is the respiration rate of this bacterial biofilter. The remaining oxygen content in the effluent from the biofilter is measured continuously by an oxygen electrode. This value is related to the dissolved oxygen (DO) of the river water measured in a by-pass. In presence of inhibitory substances the DO content in the biofilter increases because of the reduced respiration activity of the bacteria. The addition of nutrients may lead to an increase of biomass and of respiration activity. This results in an increasing oxygen difference between DO contents in the biofilter influent and effluent. Therefore, the degree of poisoning is better perceptible. Moreover each nutrient causes a distinct biofilm with a specific sensitivity against chemicals. This effect will be shown for Sodium-Pentachlorophenolate (Na-PCP).
一种市售的细菌毒性监测仪（“Toxiguard”，BTG Anlagentechnik，德国波鸿）被用于河流连续监测测试。该系统利用生物膜运行，旨在检测水中的有毒物质。河水通过两个生物反应器，形成具有典型河流细菌的生物膜。生物监测仪的指示参数是这种细菌生物滤池的呼吸速率。生物滤池流出物中的剩余氧气含量由氧电极连续测量。该值与旁路中测量的河水溶解氧（DO）相关。在存在抑制物质的情况下，由于细菌呼吸活动降低，生物滤池中的溶解氧含量会增加。添加营养物质可能会导致生物量和呼吸活动增加。这会导致生物滤池进水和出水的溶解氧含量之间的氧差增大。因此，中毒程度更容易察觉。此外，每种营养物质都会形成具有特定化学敏感性的独特生物膜。五氯酚钠（Na-PCP）将展示这种效果。
