DE10025801A1 - Rain water introduction detection in sewage pipeline, involves spraying phenolphthalein and soda solution in rain water and sewage water paths to detect mixing of rain and sewage water by monitoring color reaction - Google Patents

Abstract

Phenolphthalein dissolved in ethanol, is sprayed in rain water collection areas like roofs, terraces etc,. and outlets. Soda solution is sprayed in sewage pipeline and in specific areas where there is possibility of mixing of rain water with sewage water. By monitoring color reaction between phenolphthalein and soda solution, mixing of rain water and sewage water is confirmed.

Description

The invention relates to a method with the help of which a reliable assessment at all times improper movement of rainwater into sewage networks (dirty water line systems) can be given.

With the invention a method is described, which mainly of wastewater treatment is useful, but also wastewater associations, state Environmental agencies or environmental organizations in free ownership and also municipalities interested in this procedure to be described below.

From today's perspective, it is often no longer justifiable that annual rainfall emerging surface waters, in sizes that can only be roughly estimated, together with z. B. Household wastewater from sewage treatment plants be fed. The associated additional costs for cleaning are ultimately over the municipalities / housing associations or homeowners with payment of the Waste water fee financed additionally.

According to the current state of knowledge, it is therefore oriented to the fact that surface water (Rainwater) separated from wastewater either stored directly or by means of separate systems are fed to the receiving water.

Out of increased environmental awareness, the proportion of this separate derivative increases especially when creating new housing developments, although according to conventional ones Methods of checking the actual separation with more or less success is carried out.

A known method in this direction is the fogging of pipeline networks Sewerage. Here, by introducing the mist into the main sewer system the effect achieved that due to the so-called "chimney effect" the fog at a higher point emerges and thus the path of discharges can be traced.

In the "ideal case" this mist should then be on downpipes, for example roof drainage be determined. However, it is not possible to identify discharges that occur in the In connection with odor traps. It is also possible under certain circumstances not possible, when connecting several single conductors, the specific incorrect connection of the respective determine individual.  

There are also methods that use colored liquid to flow the way Evidence of surface water up to the discharge into the municipal sewage network. This Although environmentally compatible one-component solutions have the disadvantage that the for example green and intense color when properly introduced into a Rainwater system leaves an unpleasant visual appearance in the receiving water and other color solutions sustainable and therefore undesirable color changes on tiled roofs or create facades that do not through the use of intensely colored color solutions can be excluded.

Also the particularly simple-looking method of spraying normal water on Roofs of houses contain a number of misinterpretations and can only be proportionate low informative value, for example after long periods of drought. This procedure is not conclusive and can only be used for prior orientation become.

It is therefore an object of the invention to propose a method which overcomes the disadvantages of known state of the art overcomes and with little material and technical equipment Effortful assessment of the exact whereabouts of surface water to be drained off allowed. Another essential criterion for solving the task should be the environmentally friendly aspect of the reagents used in combination with a non color-changed surface wetting.

Other effects that can be achieved in the future in terms of the task would be in particular:

• - Minimizing the amount of dirty water with the consequence of energy and Waste water treatment cost reduction
• - Reduction of investment costs, e.g. B. in the redesign of sewage treatment plants
• - Avoid unnecessary overloading of sewage canals in strong Rainfall.

According to the invention the object is achieved as follows, with regard to the basic inventive thought is referred to claim 1 and the further Embodiment of the method in claims 2 to 6 takes place.

Further explanations are required to explain the invention.

In the area of the creation or collection of paths to be checked and ultimately the initiation of A prepared water sample is applied to surface water. The places of this special  The test mainly concerns roof areas or gutters / downspouts, slot inlets, Floor drains on patios, courtyard areas or other drainage, the whereabouts of the surface water arising here is to be examined.

The prepared water sample, as a strongly aqueous solution, contains an alcoholic phenol phthalein solution, hereinafter referred to as R (reagent) 1 and is apparently colorless, being applied externally by spraying it onto the roof of a house or introducing it into suspected / known inflow of surface water occurs. Depending on the size the roof area or the capacity of the drain pipes in land should be guaranteed be that any existing siphons are rinsed sufficiently and the incoming Amount of liquid at measuring points is sufficient to carry out the method. Usually 101 is sufficient.

In a further process step, this is not otherwise contained in the dirty water Mixture R1 examined with regard to its path to be covered in that on typical Points (measuring points) of entry into pipelines leading away from built-up properties, here on the one hand on the inspection shaft or via the basic pipeline and the connection duct on On the other hand, inlet into the dirty water main line, by adding a reagent R2 can be recognized by a clearly marked color reaction.

This optical color reaction can take place on the inspection shaft within a built-up plot can be determined without further aids, whereas in the area of the inlet of the Connecting duct into the main sewage pipe laid in a street by means of a remote-controlled video camera or by means of the inspection shaft suitable image acquisition technology within a built-up plot of evidence additionally documented.

It should again be expressly pointed out that the Kon concentrations of both components used no impairment of the building fabric and Environmental impact and the harmlessness of the water can be certified.

In one embodiment, the invention will be explained in more detail.

A solution R1 heavily diluted with water with an alcoholic phenolphthalein solution is dissolved in a first process step on roof surfaces or inlets of a property in one Amount spent up to approx. 10 l of liquid, which is colorless and sufficient to take the path Evidence of possible incorrect initiation.  

The concentration of the phenolphthalein solution should be 0.001%, and using a 1% phenolphthalein solution in alcohol, one liter of this solution should be diluted with 1 m ^{3 of} water.

At the location of the investigation / review of the possible flow of the misguided (Waste water) surface water, namely the inspection shaft in the area of the built-up area Property or in the area of the discharge from the connection channel into the dirty water main Line is either manually (in the first application) or with the help of a spray lance (in second application) the reagent R2, for example dilute sodium hydroxide solution added. In the case of using the aforementioned dilute sodium hydroxide solution, the if applicable, red color reaction, the proof is provided by an incorrect introduction. Here is enough usually the addition of a few ml.

As reagents R1 and R2 (phenolphthalein dissolved in ethanol and dilute sodium hydroxide solution) other suitable substances can also be used, but always on all sides Environmental compatibility, with regard to the known water hazard classes, must be observed.

Finally, it should be pointed out that the 2-stage examination procedure also in reverse order of the substances to be used is feasible.

The checking of a possible color reaction at the transition of the connecting channel into the Dirty water main pipe is carried out by using a remote-controlled and movable Channel camera.

Claims (6)

1. A method for determining the incorrect introduction of rainwater in sewage pipes, characterized in that in surface water-draining systems or on surfaces with existing inlets such as roofs, terraces, courtyard areas, etc., a specified amount of a mixture consisting of the reagent R1 manually given or sprayed and in the area the expected flow at measuring points, e.g. B. a reagent R2 is added to the inspection shaft of a built-up property or at the transition of the connecting duct into the dirty water main line and documentation is carried out using image recording or automatic, movable film technology. 2. A method for determining the incorrect discharge of rainwater according to claim 1, characterized characterized in that the mixture referred to as reagent R1 from an aqueous solution with phenolphthalein dissolved in alcohol. 3. A method for detecting a faulty discharge of rainwater according to claim 1, characterized characterized in that dilute sodium hydroxide solution is used as reagent R2. 4. A method for determining incorrect discharge of rainwater according to claim 1, 2 and 3 characterized in that at inaccessible places of the presumed introduction by means of Spray lance spent the reagent R2 and the expected color reaction using a suitable movable channel cameras can be documented. 5. A method for determining incorrect discharge of rainwater according to claim 1 to 4 characterized in that the order of use of the reagents used can also be done vice versa. 6. A method for determining incorrect discharge of rainwater characterized in that that other color-reacting reagents can also be used.