Biotechnology Vol 11a Wastewater Treatment Winter

Biotechnology Vol 11a Wastewater Treatment Winter

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Extra resources for Biotechnology Vol 11a Wastewater Treatment Winter

Sample text

Since hydrolysis is not only catalyzed by freely soluble exoenzymes, diluted in the bulk mass of liquid, but to a much higher extent by enzymes which are excreted in the neighborhood of bacterial colonies growing attached to the surface of the particles, the above mentioned description of complex fermentation processes 25 is not always valid. Cellulases, may be arranged in cellulosomes, that attach to the particles, which serve as carrier material until they themselves are solubilized. For this reason, VAVILIN et al.

In a trickling filter system apparently an even higher proportion of the substrate seems to be respired. This might be due to protozoa grazing off part of the biofilm. For comparison, Tab. 1 also summarizes the carbon dissipation for anaerobic methanogenic degradation. Only about 5% of the fermentable substrate are used for cell growth (surplus sludge formation) in anaerobic reactors, whereas 95% are converted to methane and CO,, and most of the energy of the substrates is conserved in the fermentation products.

Since air with almost 80% "ballast nitrogen" is normally used as a source of oxygen in aeration ponds or activated sludge reactors, the heat transfer capacity of the offgas is high enough to prevent a significant increase of the wastewater temperature. Thus, ambient or at least mesophilic temperatures can be maintained. An increasing temperature of several "C would lead to a shift of the population in the reactor and - at least temporarily - would result in reduced process stability, whereas an only slightly increased temperature of a few "C might simply stimulate the metabolic activity of the prevalent mesophilic + 2 Decomposition of Organic Carbon Compounds in Natural and Man-Made Ecosystems population.

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