Hydraulic and earth engineering – Fluid control – treatment – or containment – Flow control
Patent
1999-11-29
2000-12-26
Will, Thomas B.
Hydraulic and earth engineering
Fluid control, treatment, or containment
Flow control
251121, E02B 716, E02B 806, F15D 100, F16L 5502
Patent
active
061648698
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for influencing a wastewater flow in a residential area wastewater management system, in particular for reducing the peak outflows in these wastewater systems.
Wastewater systems or sewer systems are marked by an extremely discontinuous input, which for the most part makes the operating sequences impossible to calculate. The only route left to the planner is therefore to provide capacities which are based on the sizing guidelines for peak precipitation levels and are able to absorb even such relatively large amounts of precipitation. It becomes clear in this case that these capacities contain enormous volume reserves under normal operation, and that it was hitherto not possible to make optimum use of said reserves because of a lack of suitable technical equipment.
GB Patent 1 543 374 discloses a system in which retaining sections are connected into a wastewater system. To this end, separate retaining basins are formed, and the wastewater is held back in these. At the end of the retaining section, a manhole is provided, from which the normal wastewater sewer leads on, while at the side the overflow is led off to an outfall.
Also known are throttle slides which, on the one hand, are controlled manually, without additional technical equipment, on the other hand are controlled electrically or pneumatically on the basis of flow measurements. A drainage system of this type is shown, for example, in German Offenlegungsschrift 34 18 813. As a result of a throttling device, the wastewater in the collector backs up, until an overflow, which is arranged upstream of the collector, is reached. The wastewater then passes from this overflow into an outfall. Here, too, separate sewers are necessary for the overflow to the outfall.
Nowadays, however, the introduction of peak rain-water discharges, and hence also of dirt loading, which gets into the watercourses via the rainwater overflows, is intended to be reduced to a minimum, and to be matched to the loading of the respective outfall. By this means, it is intended to reduce the ecological "stress" in outfalls.
The present invention is based on the object of offering a cost-effective solution in order to make existing sewer reservoirs usable and to improve the entire management of wastewater.
The way to achieve this object is by activating existing reservoirs in the wastewater system over a large area in order to retard the outflow.
Present-day wastewater systems, which, on account of being dimensioned to match the sizing guidelines, have transport capacities which are used only a few times per year, specifically about 5-10%, conceal enormous volume reserves which were hitherto unused. Since, within the sense of the sizing guidelines for the configuration of rainwater relief systems in mixed sewers [German ATV A 128], it is permissible to include such storage chambers in the calculation, given clever use of these available retention volumes, it is possible to redimension the previously planned rainwater basins and to reduce them to a minimum size.
The above-mentioned objectives may be realized by intelligent outflow control by means of the throttling elements in the sewer network. In this case, the intention is to produce retardation of the outflow via the selected throttling element, decentrally and in a simple manner, by means of the use of suitable throttling elements, without complicated measurement, control and remote-control engineering. At the same time, this has the result that the sewer network is used as a retention sewer network, and hence the enormous volume reserves can have their function changed to storage volumes which can be included in the calculation in the sense of rainwater treatment.
As a result of the present invention, the peak outflow values, which have been demonstrated using the course of the characteristic curve, for the lower-lying regions are reduced, and hence the frequency and quantity of water when entering the watercourses is reduced. At the same time, there is the possibility that, in this way, existing
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Guthler Harald
Muhlhaupt Ralf
Mayo Tara L.
Renate Guthler
Will Thomas B.
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