Rottebehaelter
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Rottebehaelter as a component of decentral systems has been increasingly used in Austria, Germany and Switzerland for domestic wastewater pre-treatment. Since its application is until now only limited to German speaking countries, there is no English word for it, but can be called pre-composting tank. However, in this work the term “Rottebehaelter� is used to make clear to which system it refers. A Rottebehaelter consists usually of an underground monolithic concrete tank having two filter beds at its bottom or two filter bags that are hung side by side and used alternately in an interval of 6-12 months.
It is watertight and structurally sound in order to avoid entering of extraneous groundwater in it and leakage of the filtrate into the groundwater which would cause groundwater pollution. The top opening is covered by a prefabricated concrete slab and provided with ventilation so that air can enter. A shutter for changing the filter bag or emptying treated material, adding bulking agents such as straw, bark etc. into the retained materials, inspection and cleaning has been provided on the covering of the tank.
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