Importance of Ecological Considerations on Design and Operation of Trickling Filters,
KARLSRUHE UNIV (GERMANY F R) INST E OF BIOENGINEERING
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The experimental results described above support the general idea that the establishment of consecutive environmental zones within a wastewater treatment process is technologically feasible, and economically beneficial. But that is not a surprise at all since we did nothing but copy patterns typical for natural aquatic systems. As sanitary engineers, we have always tried to copy these patterns. But with increasing emphasis on single sludge, extended aeration system - whatever the reason for that emphasis may have been - the connection to the ecological fundamentals were lost. With single sludge systems we have attempted to solve all problems, and evidence process we can almost do it, but we have to pay for it. The choice of environmental factors necessarily favors only particular biocommunites, and is usually disadvantaguous for the other biocummunites of concern. It is impossible to establish a biocommunity which is simultaneously as active in soluble organics removal as it is in nitrification. Thus, the system size must be enlarged, making tremendous costs, especially energy costs, inevitable. Two-stage biological systems favoring the establishment of a succession of biocommunities for specific duties is a promissing alternative.