Influences of drugs on the oxygen uptake rate and biosorption of activated sludge.

To prevent pollution of the water environment by drugs, we evaluated factors affecting the elimination of drugs by inducing reactions between the pharmaceutical chemicals originating from the drugs and activated sludge (AS) in test tubes. Of 30 pharmaceutical chemicals examined, ibuprofen (IBP) as an anti-inflammatory drug most markedly inhibited the oxygen uptake rate (OUR) of AS, and its IC50 was 172 mg/l. The IBP elimination from the wastewater was due to the significant biosorption by AS and was based on the time-response and dose-response relationships.

[Development of the new desiccator system for measuring the removal effect of the formaldehyde as an indoor air pollutant by the adsorbent].

The new desiccator system with measures for the prevention of dew drops and the processing of the formaldehyde (FA) gas discharged from the final desiccator was produced, and the FA removal rate for various adsorbents was examined. For the prevention of dew drops in the desiccator, a hygroscopic bottle containing silica gel was used next to the FA gas generator, and humidity was adjusted by adjusting the interval between the FA gas outlet (a) and the desiccant (b). The removal of the harmful FA gas discharged from the final desiccator (n=5) is an important in the environmental preservation.

[Relation between oxygen uptake rate and biosorption of activated sludge against chemical substance].

In this study, the elucidation of the toxicity mechanism was undertaken regarding the IC(50) of the oxygen uptake rate (OUR) with relevance to the biosorption as a toxicity evaluation of chemical substances for activated sludge (AS). At the IC(50) of<100 mg/l, malachite green (MG) and crystal violet (CV) were confirmed in the group showing relatively strong OUR inhibition. These dyes were markedly biosorbed by AS in a short time.