Abstract
The increasing number of people who come to enjoy the beauty of the Alps makes it necessary to provide proper disposal of the wastewater produced in the touristic resorts including huts and cabins. Advanced wastewater treatment is not easy to achieve because of the difficult conditions prevailing in this region. Highly variable wastewater flows, low temperature in winter, poor availability of input data for design, energy problems, and the demand for keeping costs for building and maintenance at a minimum level are the key obstacles in the process of implementing wastewater treatment facilities. In the past, trickling filter plants have been commonly applied, since this technology has been assumed to provide fairly high reliability despite the aforementioned conditions. The results of a survey focusing on the efficiency of such systems showed that to take into account only peak loads is insufficient when designing a plant. In addition, it is necessary to provide measures to handle discontinuous load conditions by managing water distribution to the trickling filter, and by a recirculation strategy adapted to each condition scenario. Based on the results obtained a number of process modifications are suggested. The overall performance could be enhanced considerably with only a few process modifications.
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